arXiv:2604.22568v1 Announce Type: new Abstract: We study truncations of hierarchical equations of motion (HEOM) for finite-dimensional open quantum systems. We prove that for finite-dimensional approximations constructed with a Schur-complement type of terminator, the spectrum converges to that of
Read full article →arXiv:2604.22588v1 Announce Type: new Abstract: We develop analytical and algorithmic techniques that enable efficient simulation of a broad class of noisy stabilizer circuits. We derive closed-form expressions of expectation values for tensor product of Paulis in circuits with non-deterministic Pa
Read full article →arXiv:2604.22593v1 Announce Type: new Abstract: Proposed experiments for gravitationally induced entanglement (GIE) typically suppress direct electromagnetic interactions between two massive particles by inserting a conducting Faraday shield. For superconducting particles, their large diamagnetism
Read full article →arXiv:2604.22627v1 Announce Type: new Abstract: Joint measurements on multiple copies of a quantum state provide access to nonlinear observables such as $\operatorname{tr}(\rho^t)$, but whether replica number marks a sharp information-theoretic resource boundary has remained unclear. For every fixe
Read full article →arXiv:2604.22664v1 Announce Type: new Abstract: Near-term hardware is constrained by high error rates, small qubit counts, and relatively low output fidelity, making the execution of large, high performance quantum circuits difficult. Circuit partitioning (or circuit cutting) has emerged as a promi
Read full article →arXiv:2604.22704v1 Announce Type: new Abstract: Precise and autonomous clocks are of fundamental interest and central importance to both foundational studies and practical applications. Here, we construct a blueprint for a quantum clock governed by time-independent interactions. By carefully-engine
Read full article →arXiv:2604.22751v1 Announce Type: new Abstract: Symmetry-resolved spectroscopies, such as angle-resolved photoemission spectroscopy and polarization-resolved Raman, are central for quantum material characterization, yet remain challenging at nanoscale dimensions and low frequencies. Here, we propos
Read full article →arXiv:2604.19707v2 Announce Type: cross Abstract: In quadratic gravity, with a positive Weyl squared coefficient, the extra spin-2 sector is shown to correspond to a dual inverted harmonic oscillator, instead of a ghost. Using the Wightman spectrum condition, we prove that the associated K\"{a}ll\'
Read full article →arXiv:2604.21992v1 Announce Type: cross Abstract: We investigate the effect of a periodic electric field drive on the generalized Aubry-Andr\'e model, also known as the Ganeshan-Pixley-Das Sarma (GPD) model, which is well known as a host of mobility edges. Our study of the Floquet spectrum of the d
Read full article →arXiv:2604.22112v1 Announce Type: cross Abstract: Tantalum is a promising platform for superconducting quantum circuits, yet coherence times remain limited by dielectric losses from interfacial two-level systems (TLS), exacerbated by native oxide regrowth. Here, we implement molecular surface passi
Read full article →arXiv:2604.22336v1 Announce Type: cross Abstract: We propose a quantum-enhanced sensing scheme for the detection of wave-like dark matter and high-frequency gravitational waves using two-dimensional ion crystals in a Penning trap. The protocol employs spin-motion squeezed states to improve the sign
Read full article →arXiv:2604.22537v1 Announce Type: cross Abstract: This work describes a few-body dynamics method based on the Faddeev integral equations in momentum space for determining the total cross sections of fusion and breakup reactions with two- and three-body final channels in the continuum, employing a c
Read full article →arXiv:2604.22553v1 Announce Type: cross Abstract: Proximity-induced superconductivity in low-dimensional systems offers a powerful pathway to engineer topological superconducting phases in, otherwise, non-superconducting systems. These exotic phases are of fundamental and technological interest due
Read full article →arXiv:2604.22600v1 Announce Type: cross Abstract: Active matter is driven out of equilibrium by a local influx of energy. While classical active matter has been extensively studied, the extension of active matter concepts to quantum systems has been explored far less. In this work we develop a full
Read full article →arXiv:2604.22718v1 Announce Type: cross Abstract: We describe a numerical many-body technique that is based on both tensor networks and quantum Monte Carlo. The variational ansatz is a tensor network that can harvest volume-law entanglement. It is constructed from a tensor train to which one applie
Read full article →arXiv:2208.06471v5 Announce Type: replace Abstract: In the classic multi-stage Stern$-$Gerlach experiment conducted by Frisch and Segr\`e, the Majorana (Landau$-$Zener) and Rabi formulae diverge afar from the experimental observation while the physical mechanism for electron-spin collapse remains u
Read full article →arXiv:2402.17007v2 Announce Type: replace Abstract: In this paper, we develop the resource theory of quantum secret key. Operating under the assumption that entangled states with zero distillable key do not exist, we define the key cost of a quantum state, and device. We study its properties throug
Read full article →arXiv:2408.09850v2 Announce Type: replace Abstract: This study explores the dual role of a squeezed reservoir in controlling the quantum phase synchronization of a driven two-level system. We first demonstrate, through a Liouvillian eigen-spectrum analysis, that the squeezed reservoir can induce a
Read full article →arXiv:2411.09256v2 Announce Type: replace Abstract: We study higher order quantum maps in the context of a *-autonomous category of affine subspaces. We show that types of higher order maps can be identified with certain Boolean functions that we call type functions. By an extension of this identif
Read full article →arXiv:2412.11778v4 Announce Type: replace Abstract: We introduce a classical computational method for quantum dynamics that relies on a global-in-time variational principle. Unlike conventional time-stepping approaches, our scheme computes the entire state trajectory over a finite time window by mi
Read full article →arXiv:2412.15665v2 Announce Type: replace Abstract: Motivated by recent progress in quantum hardware and algorithms researchers have developed quantum heuristics for optimization problems, aiming for advantages over classical methods. To date, quantum hardware is still error-prone and limited in si
Read full article →arXiv:2501.16335v4 Announce Type: replace Abstract: Quantum information scrambling (QIS) describes the rapid spread of initially localized information across an entire quantum many-body system through entanglement generation. Once scrambled, the original local information becomes encoded globally,
Read full article →arXiv:2502.02491v2 Announce Type: replace Abstract: We consider the quantum analog of the generalized Zernike systems given by the Hamiltonian: $$\hat{\mathcal{H}}_N =\hat{p}_1^2+\hat{p}_2^2+\sum_{k=1}^N \gamma_k (\hat{q}_1 \hat{p}_1+\hat{q}_2 \hat{p}_2)^k ,$$ with canonical operators $\hat{q}_i,\,
Read full article →arXiv:2503.11785v3 Announce Type: replace Abstract: Quantum error mitigation (QEM) has emerged as a powerful tool for the extraction of useful quantum information from quantum devices. Here, we introduce the Subspace Noise Tailoring (SNT) algorithm, which efficiently combines the cheap cost of Symm
Read full article →arXiv:2505.19723v4 Announce Type: replace Abstract: Superposed coherent states are central to quantum technologies, yet their reliable identification remains a challenge, especially in noisy or resource-constrained settings. We introduce a novel, directly measurable criterion for detecting cat-like
Read full article →arXiv:2507.07249v2 Announce Type: replace Abstract: The fluctuation-dissipation theorem (FDT) is a fundamental result in statistical mechanics. It stipulates that, if perturbed out of equilibrium, a system responds at a rate proportional to a thermal-equilibrium property. Applications range from pa
Read full article →arXiv:2507.23787v2 Announce Type: replace Abstract: We prove that the generic quantum speedups for brute-force search and counting only hold when the process we apply them to can be efficiently inverted. The algorithms speeding up these problems, amplitude amplification and amplitude estimation, as
Read full article →arXiv:2508.00055v2 Announce Type: replace Abstract: Many quantum algorithms, to compute some property of a unitary $U$, require access not just to $U$, but to $cU$, the unitary with a control qubit. We show that having access to $cU$ does not help for a large class of quantum problems. For a quantu
Read full article →arXiv:2508.10660v2 Announce Type: replace Abstract: We explore the potential application of quantum annealing to address the protein structure problem. To this end, we compare several proposed ab initio protein folding models for quantum computers and analyze their scaling and performance for class
Read full article →arXiv:2508.14583v2 Announce Type: replace Abstract: The quantum theory of relativistic particles, based on the first quantization technique similar to that used by Schroedinger and Dirac in formulating quantum mechanics, is reconsidered on the basis of a photon-like dispersion relation correspondin
Read full article →arXiv:2508.18147v2 Announce Type: replace Abstract: Molecular docking is a critical computational method in drug discovery used to predict the binding conformation and orientation of a ligand within a protein's binding site. Mapping this challenge onto a graph-based problem, specifically the Maximu
Read full article →arXiv:2509.06873v3 Announce Type: replace Abstract: Quantum Machine Learning (QML) has emerged as a promising framework for exploring how quantum dynamics may enhance data processing tasks. Here we investigate Quantum Extreme Learning Machines (QELMs), a quantum analogue of classical Extreme Learni
Read full article →arXiv:2509.15483v2 Announce Type: replace Abstract: Extracting momentum-resolved excitation spectra in strongly correlated quantum systems remains a major challenge, especially beyond one spatial dimension. We present an efficient tensor-network approach to compute dispersion relations via imaginar
Read full article →arXiv:2510.20046v3 Announce Type: replace Abstract: Solvable bosonic models provide a fundamental framework for describing light propagation in nonlinear media, including optical down-conversion processes that generate squeezed states of light and their higher-order generalizations. In quantum opti
Read full article →arXiv:2511.19687v2 Announce Type: replace Abstract: Absorption spectroscopy is a fundamental tool for probing molecular structure. However, performing absorption spectroscopy on individual molecules is challenging due to the low signal-to-noise ratio. Here, we report on a nondestructive absorption
Read full article →arXiv:2511.20026v2 Announce Type: replace Abstract: Fast coherent state transport is essential to quantum computation and quantum information processing. While an adiabatic transport of atomic qubits guarantees a high fidelity of the state preparation, it requires a long timescale that defies effic
Read full article →arXiv:2512.09007v2 Announce Type: replace Abstract: In this paper, a method is developed for the study of a generic small central quantum system, which is locally coupled to an environment as a many-body quantum chaotic system that satisfies the eigenstate thermalization hypothesis (ETH) ansatz. Th
Read full article →arXiv:2512.14302v2 Announce Type: replace Abstract: Multipartite nonlocality has been extensively investigated within one-dimensional quantum lattices. Previous research has primarily focused on the nonlocality measure $S$, which quantifies the violation of Bell-type inequalities. However, the opti
Read full article →arXiv:2512.16197v2 Announce Type: replace Abstract: Color centers hosted in hexagonal boron nitride have emerged as a highly promising platform for single-photon emission and spin-photon technologies relevant to quantum communication and quantum networking. As a wide-bandgap van der Waals material,
Read full article →arXiv:2601.03230v2 Announce Type: replace Abstract: We show that excitons coupled to cavity photons and phonons admit a generalized Bloch theorem when formulated for the conserved total crystal momentum. In minimal-coupling and Fr\"ohlich representations, the interchange of momenta between fermions
Read full article →arXiv:2603.15190v2 Announce Type: replace Abstract: We study the error-correction properties of multi-mode Fock-state codes under amplitude-damping (AD) noise, focusing on the asymptotic regime in which the total excitation of the code states grows without limit and the number of photon losses indu
Read full article →arXiv:2603.15515v3 Announce Type: replace Abstract: Solving large-scale sparse linear systems is a challenging computational task due to the introduction of non-zero elements, or "fill-in." The Graph Partitioning Problem (GPP) arises naturally when minimizing fill-in and accelerating solvers. In th
Read full article →arXiv:2603.24237v2 Announce Type: replace Abstract: Atom loss is a dominant error source in neutral-atom quantum processors, yet its correlated structure remains largely unexploited by existing quantum error correction decoders. We analyze the performance of the surface code equipped with teleporta
Read full article →arXiv:2603.29439v4 Announce Type: replace Abstract: Superconducting quantum processor units (QPUs) are incapable of producing massive datasets for quantum error correction (QEC) because of hardware limitations. Thus, QEC decoders heavily depend on synthetic data from qubit error models. Classic dep
Read full article →arXiv:2604.06461v2 Announce Type: replace Abstract: We introduce a systematic protocol for constructing quantum Hilbert-space-fragmented Hamiltonians, whose Krylov-sector structure, unlike in classically fragmented models, can be fully resolved only in an entangled basis. The protocol takes as inpu
Read full article →arXiv:2604.08367v2 Announce Type: replace Abstract: The Quantum Approximate Optimization Algorithm (QAOA) has emerged as a promising approach for addressing combinatorial optimization problems on near-term quantum hardware. In this work, we conduct an empirical evaluation of QAOA on the Max-Cut pro
Read full article →arXiv:2604.09196v3 Announce Type: replace Abstract: The standard stimulated Raman adiabatic passage (STIRAP) protocol enables high-fidelity quantum state transfer in an ideal three-level system via adiabatic following of a dark state evolution. However, in practical systems with more energy levels,
Read full article →arXiv:2604.09775v2 Announce Type: replace Abstract: Distributed quantum computing offers a promising approach to scaling quantum devices by networking multiple quantum processors. We present a quantum state tomography protocol tailored for distributed quantum computers that avoids assuming remote e
Read full article →arXiv:2604.14224v2 Announce Type: replace Abstract: A time-integrated measure of complexity is proposed for diagnosing the degree of quantum ergodicity. The scrambling dynamics of maximally entangled states within the ensemble of unitary evolutions are quantified by applying numerical bootstrapped
Read full article →arXiv:2604.20838v2 Announce Type: replace Abstract: We construct a quantum low-density parity-check code family from a length-$512$ Calderbank--Shor--Steane base matrix pair. The base pair is permutation-equivalent to the known SPC(3) product CSS code, and the present affine-coset description gives
Read full article →arXiv:2604.21594v2 Announce Type: replace Abstract: Systematic control errors remain a primary obstacle to realizing high-fidelity single-qubit gates. We introduce composite pulse sequences that implement X and Hadamard gates while simultaneously compensating amplitude (Rabi-frequency), detuning (f
Read full article →arXiv:2412.19780v2 Announce Type: replace-cross Abstract: Tensor networks are a tool first employed in the context of many-body quantum physics that now have a wide range of uses across the computational sciences, from numerical methods to machine learning. Methods integrating tensor networks into
Read full article →arXiv:2503.15811v2 Announce Type: replace-cross Abstract: The variational determination of the two-boson reduced density matrix is described for a one-dimensional system of $N$ (where $N$ ranges from $2$ to $10^4$) harmonically trapped bosons interacting via contact interaction. The ground-state en
Read full article →arXiv:2503.21437v2 Announce Type: replace-cross Abstract: Technological understanding is not a singular concept but varies depending on context. Building on De Jong and De Haro's (2025) notion of technological understanding as the ability to realise an aim through the use of a technological artefac
Read full article →arXiv:2505.16913v3 Announce Type: replace-cross Abstract: We consider a free quantum particle in one dimension whose mass profile exhibits jump discontinuities. The corresponding Hamiltonian is a self-adjoint realisation of the kinetic-energy operator, with the specific realisation determined by th
Read full article →arXiv:2510.05242v3 Announce Type: replace-cross Abstract: Bound electron-hole pairs in semiconductors known as excitons are the subject of intense research due to their potential for optoelectronic devices and applications, especially in the realm of two-dimensional materials. While the properties
Read full article →arXiv:2512.02798v2 Announce Type: replace-cross Abstract: Single-photon sources based on neutral or charged excitons in a semiconductor quantum dot are attractive resources for photonic quantum computers and simulators. To obtain indistinguishable photons, the source is pumped on resonance with pol
Read full article →arXiv:2602.20376v2 Announce Type: replace-cross Abstract: We approach the Max-3-Cut problem through the lens of maximizing complex-valued quadratic forms and demonstrate that low-rank structure in the objective matrix can be exploited, leading to alternative algorithms to classical semidefinite pro
Read full article →arXiv:2602.21468v5 Announce Type: replace-cross Abstract: The spin-$1/2$ $J_1$-$J_2$ Heisenberg model on the square lattice exhibits a debated intermediate phase between N\'eel antiferromagnetic and stripe ordered regimes, with competing theories proposing plaquette valence bond, nematic, and quant
Read full article →arXiv:2603.19381v2 Announce Type: replace-cross Abstract: Modulated symmetries are internal symmetries that act in a spatially non-uniform manner. Consequently, when a modulated symmetry $G_{\text{int}}$ is combined with a spatial symmetry $G_{\text{sp}}$, the total symmetry group takes the form of
Read full article →arXiv:2604.00037v2 Announce Type: replace-cross Abstract: Tensor trains (TTs), also known as matrix product states (MPS), are compressed representations of high-dimensional data that can be efficiently manipulated to perform calculations on the data. In many applications, such as TT-based solvers f
Read full article →arXiv:2604.03669v2 Announce Type: replace-cross Abstract: The statistics of gaps between quantum energy levels is a hallmark criterion in quantum chaos and quantum integrability studies. The relevant distributions corresponding to exactly integrable vs. fully chaotic systems are universal and descr
Read full article →arXiv:2604.11596v2 Announce Type: replace-cross Abstract: A spectrally isolated quartet can admit a local two-qubit description at each point in parameter space and still acquire a loop holonomy outside the local subgroup $\mathrm{U}(2)\otimes\mathrm{U}(2)$. We study this question in three localize
Read full article →arXiv:2604.21857v2 Announce Type: replace-cross Abstract: New sources of charge-parity (CP) violation beyond those described in the Standard Model (SM) are required to explain the observed matter--antimatter asymmetry of the Universe. The Standard Model Effective Field Theory (SMEFT) provides a fra
Read full article →Pennsylvania has launched the Keystone AI + Quantum Factory, a first-of-its-kind statewide innovation network designed to transition academic research into industrial applications. This historic collaboration aligns the Commonwealth's seven R1 research universities—Carnegie Mellon, Drexel, Lehigh, P
Read full article →Insider Brief Mandeville Ventures Inc. has signed a definitive agreement to merge with quantum cybersecurity firm Quantropi Inc., advancing a previously announced transaction that would take the Ottawa-based company public on Canada’s TSX Venture Exchange. The agreement outlines a proposed business
Read full article →Insider Brief A quantum computer powerful enough to break the cryptography that secures Bitcoin and Ethereum will eventually be built, and the blockchain industry is running out of time to do something about it, according to the Coinbase advisory board’s new position paper. The paper stops sho
Read full article →Yuval Boger interviews Tom Darras, CEO and co-founder of Welinq. They discuss how quantum networking uses shared entanglement to interconnect quantum processors, enabling modular scale-out clusters and quantum-safe connectivity between data centers. Tom explains the technical building blocks—qubit-p
Read full article →Quantinuum LLC, a quantum hardware company majority owned by Honeywell, has filed a confidential S-1 form on February 17, 2026 with the U.S. Security and Exchange Commission (SEC) for a proposed Initial Public Offering (IPO) of Quantinuum’s common stock. This detailed registration statement will un
Read full article →QuantumCore Inc. (CSE: QNCR) has announced a strategic expansion of its partnership with the Institute for Quantum Computing (IQC) at the University of Waterloo. The collaboration is supported by a $1.7 million non-dilutive grant from the Natural Sciences and Engineering Research Council of Canada (
Read full article →The following is an executive summary of a 44 page report written by GQI's Chief Analyst, Dr. David Shaw. To obtain the full report, contact GQI at [email protected]. For years, both the cybersecurity and quantum communities have focused on RSA-2048 as the lead benchmark by which to assess the time
Read full article →Insider Brief PRESS RELEASE — Today, the National Quantum Algorithm Center (NQAC) at the Illinois Quantum and Microelectronics Park (IQMP) announced five awards in the Grand Challenges program, an initiative designed to advance quantum applications development in critical areas where
Read full article →Insider Brief PRESS RELEASE — Project Eleven today awarded the Q-Day Prize, a one Bitcoin bounty, to Giancarlo Lelli for breaking a 15-bit elliptic curve key on a publicly accessible quantum computer. The result is the largest public demonstration to date of the attack class that threaten
Read full article →Insider Brief Cisco is testing a prototype device designed to connect different quantum machines into a single network, a step that could help the technology scale beyond today’s hardware limits. The system, developed by Cisco and discussed in a company blog post, is called a universal quantum switc
Read full article →Insider Brief While everyone is scrolling through the AI hype, a deeper revolution is already underway. There is a line from Lewis Strauss that has always stuck: “Amateurs seek the sun. Get eaten. Power stays hidden in the shadows.” Quantum technology is exactly that – hidden in th
Read full article →Three RIKEN researchers have demonstrated a way to stop problematic "dark modes" from squelching intriguing effects in quantum systems. This advance could help with the development of more versatile quantum devices that can be used to control the storage and transmission of quantum information. The
Read full article →A novel approach for realizing the one-way quantum synchronization of phonons has been proposed by three theoretical physicists at RIKEN. Importantly, this method is remarkably resilient against practical challenges such as imperfections and environmental noise. Their paper, "Nonreciprocal quantum s
Read full article →npj Quantum Information, Published online: 24 April 2026; doi:10.1038/s41534-026-01242-xEfficient post-selection for general quantum LDPC Codes
Read full article →npj Quantum Information, Published online: 24 April 2026; doi:10.1038/s41534-026-01243-wPlacing and routing quantum LDPC codes in multilayer superconducting hardware
Read full article →npj Quantum Information, Published online: 24 April 2026; doi:10.1038/s41534-026-01248-5Near-term fermionic simulation with subspace noise tailored quantum error mitigation
Read full article →Q-CTRL and IonQ have announced the native integration of Q-CTRL’s Fire Opal software into the IonQ Quantum Cloud. This partnership embeds the Fire Opal Optimization Solver directly into the workflow for IonQ’s highest-performing systems, Forte and Forte-Enterprise. By automating hardware-level error
Read full article →The National Quantum Algorithm Center (NQAC) at the Illinois Quantum and Microelectronics Park (IQMP) has announced five awards under its Grand Challenges program. The initiative is designed to support postdoctoral researchers developing industry-relevant quantum applications through three-way colla
Read full article →By Mohamed Abdel-Kareem Quantum hardware is transitioning from academic fabrication to industrial manufacturing. Semiconductor standardized, and therefore highly optimized, processes enable consistency unobtainable with academic academic R&D style fabrication. However, only certain qubit modalit
Read full article →Turkish deep-tech startup Qubitrium has secured €2.25 million ($2.6 million USD) in a Seed-plus funding round led by the Türkiye Development Fund (€1.25 million) ($1.46 million USD) and ACT Venture Partners (€1 million) ($1.14 million USD). Founded in 2020 as a spin-off from QuTech and Özyeğin Unive
Read full article →Qubitrium, a Turkish-Dutch deep-tech firm, has deployed its QubitCore payload into orbit aboard SpaceX’s Transporter-16 mission. Launched on March 30, 2026, the system has entered its in-orbit validation phase to test the performance of integrated quantum hardware in space. The payload, housed withi
Read full article →Insider Brief PRESS RELEASE — Q.ANT, the pioneer in commercial photonic computing, today announced the opening of its U.S. headquarters in Austin, Texas, and the appointment of semiconductor veteran Bruno Spruth as Chief Technology Officer.  Spruth, who previously served as Vice
Read full article →Insider Brief PRESS RELEASE — Zapata Quantum (OTC: ZPTA) (“Zapata”, “Zapata Quantum” or the “Company”), a pioneer in quantum computing application and algorithm development, today announced the completion of an oversubscribed $15 million financing led by Triatomic Capital, a leading technology
Read full article →Insider Brief PRESS RELEASE — enQase, a pioneer in quantum security and crypto-agility, today announced the addition of Mahi Dontamsetti to the enQase Advisory Board. The appointment strengthens enQase leadership across board-level technology and risk governance as organizations prepare for th
Read full article →The most demanding calculations in quantum chemistry can now be solved with graphics processing unit (GPU) supercomputers. A recently published study shows that software adapted to use GPU hardware can provide not just speed, but also the accuracy needed to solve complex chemistry problems. The work
Read full article →Semiconductor spin qubits are a promising candidate for the building blocks of next-generation quantum computers due to their high potential for integration and compatibility with existing semiconductor technologies. Qubits—like the 0s and 1s of a traditional computer—serve as a basic unit of inform
Read full article →Quantum computers, devices that process information leveraging quantum mechanical effects, could tackle some tasks that are difficult or impossible to solve using classical computers. These systems represent data as qubits, units of information that can exist in multiple states at once, unlike the b
Read full article →Researchers in the US and Germany have unveiled a theoretical blueprint for an atomic clock driven by a highly synchronized laser, where atoms work in concert rather than independently. Publishing their results in Physical Review Letters, Jarrod Reilly at the University of Colorado, Simon Jäger at t
Read full article →Guest post by Sean Harpur, CEO of Moth When people talk about the race to build quantum computers, the conversation usually focuses on hardware. How many qubits a machine has. How stable those qubits are. How close researchers are to overcoming the engineering challenges that have held the field bac
Read full article →It was a head-spinning discovery. In 2018, researchers in Japan claimed to find concrete evidence of an elusive particle, a Majorana fermion, in a quantum spin liquid called ruthenium trichloride. Majoranas are highly sought-after by quantum materials scientists because when a pair are localized, or
Read full article →A new method developed at LMU overcomes fundamental resolution limits and may provide insights into high-temperature superconductivity. Physicist Dr. Sebastian Paeckel has developed a method that can be used to calculate spectral functions of complex quantum systems much more precisely than was poss
Read full article →When you throw a ball in the air, the equations of classical physics will tell you exactly what path the ball will take as it falls, and when and where it will land. But if you were to squeeze that same ball down to the size of an atom or smaller, it would behave in ways beyond anything that classic
Read full article →A tiny discrepancy in particle physics has loomed for decades as an exciting possible crack in one of science's most successful theories, hinting at unknown forces or quantum objects. Now, an international team led by a Penn State physicist has published the most precise study yet to reveal the disc
Read full article →Only about 5% of the universe is composed of normal matter that we can directly observe, while the remaining 95% is widely believed to consist of dark matter and dark energy. Paradoxically, however, the nature of these dark components remains unknown. Is this due to limitations in our observational
Read full article →npj Quantum Information, Published online: 22 April 2026; doi:10.1038/s41534-026-01241-ySurface-code hardware Hamiltonian
Read full article →As long as there's been an internet, there's been a way to hack it. Scientists have spent decades imagining a different kind of network, one where the laws of physics make eavesdropping physically impossible, not just technically difficult. They call that dream a quantum internet.
Read full article →Researchers from the University of Twente and Harvard University have developed a new way to generate ultraviolet (UV) light on a photonic chip at power levels high enough for real-world use. For the first time, the technique produces milliwatt-level UV light on a chip. It is an important step for q
Read full article →Researchers have discovered a new way to tune the quantum properties of tiny defects in diamond—by gently stretching or compressing the crystal. These findings could pave the way for next-generation sensors that can detect pressure, temperature, and other physical changes with unprecedented precisio
Read full article →A quantum spin liquid is a phase of matter in which the magnetic moments in a material do not align or freeze, even at temperatures close to absolute zero (i.e., at 0 K). The experimental realization of this highly dynamic state could have important implications for the development of quantum comput
Read full article →npj Quantum Information, Published online: 21 April 2026; doi:10.1038/s41534-026-01247-6Distributed quantum inner product estimation with structured random circuits
Read full article →npj Quantum Information, Published online: 21 April 2026; doi:10.1038/s41534-026-01221-2Two-qubit gates using on-demand single-photons from ordered shape and size controlled large-volume superradiant quantum dots
Read full article →The cosmological constant is the mathematical description of the energy that drives the ever-accelerating expansion of the cosmos. It's also the source of one of the most enduring and confounding problems in modern physics.
Read full article →A new theoretical study finds shorter laser pulses achieve higher quantum efficiency for photoemission from a solid surface without increasing power or intensity. Using light to knock electrons loose from a surface—known as photoemission—may soon be achievable more easily in smaller labs with smalle
Read full article →A joint theoretical study by the University of Innsbruck and Zhejiang University has uncovered the microscopic origin of a striking quantum phenomenon: a periodically driven gas of ultracold atoms that simply refuses to heat up, defying classical expectations.
Read full article →Superconducting qubits—bits of quantum information—have been widely considered a promising technology for moving quantum computing forward. But there's still much work to be done before they can be brought out of a near absolute zero temperature environment. The lab of Professor Hong Tang has recent
Read full article →Few concepts in physics are as familiar, yet as enigmatic, as time. In Einstein's theory of relativity, time is not absolute: its passage depends on motion and gravity. But when combined with quantum physics, this relativistic form of time becomes even more counterintuitive.
Read full article →Two independent research teams have each demonstrated collisional quantum gates using fermionic atoms: a long-sought milestone in quantum computing where logic operations are performed through the direct physical overlap of atoms, rather than forcing them into fragile, highly excited states.
Read full article →In the quirky quantum world, particles can be affected by forces that they never directly encounter. A classic example is the Aharonov–Bohm (AB) effect, where electrons are affected by a magnetic field, despite not passing through it. Although predicted in 1959, it took more than two decades to conf
Read full article →Researchers in the UC Santa Barbara Materials Department have uncovered the elusive quantum mechanism by which energetic electrons break chemical bonds inside microelectronic devices—a detrimental process that slowly degrades performance over time. The discovery, published as an Editors' Suggestion
Read full article →A new study published in Nature Communications has shown that in the asymptotic limit, extracting the maximum possible work from many copies of a quantum system does not require knowing exactly what state that system is in.
Read full article →A joint research team led by Professor Park Kyoung-Duck and Associate Director Suh Yung Doug of the Center for Multidimensional Carbon Materials within the Institute for Basic Science (IBS) has succeeded in realizing a high-efficiency quantum light source that emits bright lights even at room temper
Read full article →An AI model informed by calculations from a quantum computer can better predict the behavior of a complex physical system over the long term than current best models that use only conventional computers, according to a new study led by UCL (University College London) researchers. The findings, publi
Read full article →npj Quantum Information, Published online: 17 April 2026; doi:10.1038/s41534-026-01228-9Collective purification of interacting quantum networks beyond symmetry constraints
Read full article →npj Quantum Information, Published online: 17 April 2026; doi:10.1038/s41534-026-01229-8Quantum reservoir computing induced by controllable damping
Read full article →A new Bar-Ilan University study points to a major advance in quantum information processing, demonstrating a way to send, manipulate, and measure quantum information across many frequency channels simultaneously, rather than one at a time. The study was recently published in the journal Science Adva
Read full article →Thin films might not come up in conversation every day, but they are all around us. Take the metallic plastic films of chip bags, for example, or the anti-reflective coatings on eyeglasses. Even the coatings on pills that make them easier to swallow are thin films. Depositing extremely thin layers o
Read full article →The spin-off company ParityQC has implemented the largest quantum Fourier transform ever reported using an IBM quantum computer, thereby setting a new milestone on the path toward the industrial application of quantum computers. The quantum Fourier transform is a cornerstone algorithm with applicati
Read full article →Researchers at Ben-Gurion University of the Negev have developed a new approach to secure optical communication that hides information in the physical structure of light, making it difficult for unauthorized parties to intercept or decode. The study addresses a growing challenge: advances in quantum
Read full article →Insider Brief PRESS RELEASE — enQase, a pioneer in quantum security and crypto-agility, today announced the addition of Mahi Dontamsetti to the enQase Advisory Board. The appointment strengthens enQase leadership across board-level technology and risk governance as organizations prepare for th
Read full article →The most demanding calculations in quantum chemistry can now be solved with graphics processing unit (GPU) supercomputers. A recently published study shows that software adapted to use GPU hardware can provide not just speed, but also the accuracy needed to solve complex chemistry problems. The work
Read full article →Semiconductor spin qubits are a promising candidate for the building blocks of next-generation quantum computers due to their high potential for integration and compatibility with existing semiconductor technologies. Qubits—like the 0s and 1s of a traditional computer—serve as a basic unit of inform
Read full article →Quantum computers, devices that process information leveraging quantum mechanical effects, could tackle some tasks that are difficult or impossible to solve using classical computers. These systems represent data as qubits, units of information that can exist in multiple states at once, unlike the b
Read full article →Researchers in the US and Germany have unveiled a theoretical blueprint for an atomic clock driven by a highly synchronized laser, where atoms work in concert rather than independently. Publishing their results in Physical Review Letters, Jarrod Reilly at the University of Colorado, Simon Jäger at t
Read full article →Guest post by Sean Harpur, CEO of Moth When people talk about the race to build quantum computers, the conversation usually focuses on hardware. How many qubits a machine has. How stable those qubits are. How close researchers are to overcoming the engineering challenges that have held the field bac
Read full article →It was a head-spinning discovery. In 2018, researchers in Japan claimed to find concrete evidence of an elusive particle, a Majorana fermion, in a quantum spin liquid called ruthenium trichloride. Majoranas are highly sought-after by quantum materials scientists because when a pair are localized, or
Read full article →A new method developed at LMU overcomes fundamental resolution limits and may provide insights into high-temperature superconductivity. Physicist Dr. Sebastian Paeckel has developed a method that can be used to calculate spectral functions of complex quantum systems much more precisely than was poss
Read full article →When you throw a ball in the air, the equations of classical physics will tell you exactly what path the ball will take as it falls, and when and where it will land. But if you were to squeeze that same ball down to the size of an atom or smaller, it would behave in ways beyond anything that classic
Read full article →A tiny discrepancy in particle physics has loomed for decades as an exciting possible crack in one of science's most successful theories, hinting at unknown forces or quantum objects. Now, an international team led by a Penn State physicist has published the most precise study yet to reveal the disc
Read full article →Only about 5% of the universe is composed of normal matter that we can directly observe, while the remaining 95% is widely believed to consist of dark matter and dark energy. Paradoxically, however, the nature of these dark components remains unknown. Is this due to limitations in our observational
Read full article →As long as there's been an internet, there's been a way to hack it. Scientists have spent decades imagining a different kind of network, one where the laws of physics make eavesdropping physically impossible, not just technically difficult. They call that dream a quantum internet.
Read full article →Researchers from the University of Twente and Harvard University have developed a new way to generate ultraviolet (UV) light on a photonic chip at power levels high enough for real-world use. For the first time, the technique produces milliwatt-level UV light on a chip. It is an important step for q
Read full article →Researchers have discovered a new way to tune the quantum properties of tiny defects in diamond—by gently stretching or compressing the crystal. These findings could pave the way for next-generation sensors that can detect pressure, temperature, and other physical changes with unprecedented precisio
Read full article →A quantum spin liquid is a phase of matter in which the magnetic moments in a material do not align or freeze, even at temperatures close to absolute zero (i.e., at 0 K). The experimental realization of this highly dynamic state could have important implications for the development of quantum comput
Read full article →The cosmological constant is the mathematical description of the energy that drives the ever-accelerating expansion of the cosmos. It's also the source of one of the most enduring and confounding problems in modern physics.
Read full article →A new theoretical study finds shorter laser pulses achieve higher quantum efficiency for photoemission from a solid surface without increasing power or intensity. Using light to knock electrons loose from a surface—known as photoemission—may soon be achievable more easily in smaller labs with smalle
Read full article →A joint theoretical study by the University of Innsbruck and Zhejiang University has uncovered the microscopic origin of a striking quantum phenomenon: a periodically driven gas of ultracold atoms that simply refuses to heat up, defying classical expectations.
Read full article →Superconducting qubits—bits of quantum information—have been widely considered a promising technology for moving quantum computing forward. But there's still much work to be done before they can be brought out of a near absolute zero temperature environment. The lab of Professor Hong Tang has recent
Read full article →Few concepts in physics are as familiar, yet as enigmatic, as time. In Einstein's theory of relativity, time is not absolute: its passage depends on motion and gravity. But when combined with quantum physics, this relativistic form of time becomes even more counterintuitive.
Read full article →Two independent research teams have each demonstrated collisional quantum gates using fermionic atoms: a long-sought milestone in quantum computing where logic operations are performed through the direct physical overlap of atoms, rather than forcing them into fragile, highly excited states.
Read full article →In the quirky quantum world, particles can be affected by forces that they never directly encounter. A classic example is the Aharonov–Bohm (AB) effect, where electrons are affected by a magnetic field, despite not passing through it. Although predicted in 1959, it took more than two decades to conf
Read full article →Researchers in the UC Santa Barbara Materials Department have uncovered the elusive quantum mechanism by which energetic electrons break chemical bonds inside microelectronic devices—a detrimental process that slowly degrades performance over time. The discovery, published as an Editors' Suggestion
Read full article →A new study published in Nature Communications has shown that in the asymptotic limit, extracting the maximum possible work from many copies of a quantum system does not require knowing exactly what state that system is in.
Read full article →A joint research team led by Professor Park Kyoung-Duck and Associate Director Suh Yung Doug of the Center for Multidimensional Carbon Materials within the Institute for Basic Science (IBS) has succeeded in realizing a high-efficiency quantum light source that emits bright lights even at room temper
Read full article →An AI model informed by calculations from a quantum computer can better predict the behavior of a complex physical system over the long term than current best models that use only conventional computers, according to a new study led by UCL (University College London) researchers. The findings, publi
Read full article →A new Bar-Ilan University study points to a major advance in quantum information processing, demonstrating a way to send, manipulate, and measure quantum information across many frequency channels simultaneously, rather than one at a time. The study was recently published in the journal Science Adva
Read full article →Thin films might not come up in conversation every day, but they are all around us. Take the metallic plastic films of chip bags, for example, or the anti-reflective coatings on eyeglasses. Even the coatings on pills that make them easier to swallow are thin films. Depositing extremely thin layers o
Read full article →The spin-off company ParityQC has implemented the largest quantum Fourier transform ever reported using an IBM quantum computer, thereby setting a new milestone on the path toward the industrial application of quantum computers. The quantum Fourier transform is a cornerstone algorithm with applicati
Read full article →Researchers at Ben-Gurion University of the Negev have developed a new approach to secure optical communication that hides information in the physical structure of light, making it difficult for unauthorized parties to intercept or decode. The study addresses a growing challenge: advances in quantum
Read full article →arXiv:2604.22568v1 Announce Type: new Abstract: We study truncations of hierarchical equations of motion (HEOM) for finite-dimensional open quantum systems. We prove that for finite-dimensional approximations constructed with a Schur-complement type of terminator, the spectrum converges to that of
Read full article →arXiv:2604.22588v1 Announce Type: new Abstract: We develop analytical and algorithmic techniques that enable efficient simulation of a broad class of noisy stabilizer circuits. We derive closed-form expressions of expectation values for tensor product of Paulis in circuits with non-deterministic Pa
Read full article →arXiv:2604.22593v1 Announce Type: new Abstract: Proposed experiments for gravitationally induced entanglement (GIE) typically suppress direct electromagnetic interactions between two massive particles by inserting a conducting Faraday shield. For superconducting particles, their large diamagnetism
Read full article →arXiv:2604.22627v1 Announce Type: new Abstract: Joint measurements on multiple copies of a quantum state provide access to nonlinear observables such as $\operatorname{tr}(\rho^t)$, but whether replica number marks a sharp information-theoretic resource boundary has remained unclear. For every fixe
Read full article →arXiv:2604.22664v1 Announce Type: new Abstract: Near-term hardware is constrained by high error rates, small qubit counts, and relatively low output fidelity, making the execution of large, high performance quantum circuits difficult. Circuit partitioning (or circuit cutting) has emerged as a promi
Read full article →arXiv:2604.22704v1 Announce Type: new Abstract: Precise and autonomous clocks are of fundamental interest and central importance to both foundational studies and practical applications. Here, we construct a blueprint for a quantum clock governed by time-independent interactions. By carefully-engine
Read full article →arXiv:2604.22751v1 Announce Type: new Abstract: Symmetry-resolved spectroscopies, such as angle-resolved photoemission spectroscopy and polarization-resolved Raman, are central for quantum material characterization, yet remain challenging at nanoscale dimensions and low frequencies. Here, we propos
Read full article →arXiv:2604.19707v2 Announce Type: cross Abstract: In quadratic gravity, with a positive Weyl squared coefficient, the extra spin-2 sector is shown to correspond to a dual inverted harmonic oscillator, instead of a ghost. Using the Wightman spectrum condition, we prove that the associated K\"{a}ll\'
Read full article →arXiv:2604.21992v1 Announce Type: cross Abstract: We investigate the effect of a periodic electric field drive on the generalized Aubry-Andr\'e model, also known as the Ganeshan-Pixley-Das Sarma (GPD) model, which is well known as a host of mobility edges. Our study of the Floquet spectrum of the d
Read full article →arXiv:2604.22112v1 Announce Type: cross Abstract: Tantalum is a promising platform for superconducting quantum circuits, yet coherence times remain limited by dielectric losses from interfacial two-level systems (TLS), exacerbated by native oxide regrowth. Here, we implement molecular surface passi
Read full article →arXiv:2604.22336v1 Announce Type: cross Abstract: We propose a quantum-enhanced sensing scheme for the detection of wave-like dark matter and high-frequency gravitational waves using two-dimensional ion crystals in a Penning trap. The protocol employs spin-motion squeezed states to improve the sign
Read full article →arXiv:2604.22537v1 Announce Type: cross Abstract: This work describes a few-body dynamics method based on the Faddeev integral equations in momentum space for determining the total cross sections of fusion and breakup reactions with two- and three-body final channels in the continuum, employing a c
Read full article →arXiv:2604.22553v1 Announce Type: cross Abstract: Proximity-induced superconductivity in low-dimensional systems offers a powerful pathway to engineer topological superconducting phases in, otherwise, non-superconducting systems. These exotic phases are of fundamental and technological interest due
Read full article →arXiv:2604.22600v1 Announce Type: cross Abstract: Active matter is driven out of equilibrium by a local influx of energy. While classical active matter has been extensively studied, the extension of active matter concepts to quantum systems has been explored far less. In this work we develop a full
Read full article →arXiv:2604.22718v1 Announce Type: cross Abstract: We describe a numerical many-body technique that is based on both tensor networks and quantum Monte Carlo. The variational ansatz is a tensor network that can harvest volume-law entanglement. It is constructed from a tensor train to which one applie
Read full article →arXiv:2208.06471v5 Announce Type: replace Abstract: In the classic multi-stage Stern$-$Gerlach experiment conducted by Frisch and Segr\`e, the Majorana (Landau$-$Zener) and Rabi formulae diverge afar from the experimental observation while the physical mechanism for electron-spin collapse remains u
Read full article →arXiv:2402.17007v2 Announce Type: replace Abstract: In this paper, we develop the resource theory of quantum secret key. Operating under the assumption that entangled states with zero distillable key do not exist, we define the key cost of a quantum state, and device. We study its properties throug
Read full article →arXiv:2408.09850v2 Announce Type: replace Abstract: This study explores the dual role of a squeezed reservoir in controlling the quantum phase synchronization of a driven two-level system. We first demonstrate, through a Liouvillian eigen-spectrum analysis, that the squeezed reservoir can induce a
Read full article →arXiv:2411.09256v2 Announce Type: replace Abstract: We study higher order quantum maps in the context of a *-autonomous category of affine subspaces. We show that types of higher order maps can be identified with certain Boolean functions that we call type functions. By an extension of this identif
Read full article →arXiv:2412.11778v4 Announce Type: replace Abstract: We introduce a classical computational method for quantum dynamics that relies on a global-in-time variational principle. Unlike conventional time-stepping approaches, our scheme computes the entire state trajectory over a finite time window by mi
Read full article →arXiv:2412.15665v2 Announce Type: replace Abstract: Motivated by recent progress in quantum hardware and algorithms researchers have developed quantum heuristics for optimization problems, aiming for advantages over classical methods. To date, quantum hardware is still error-prone and limited in si
Read full article →arXiv:2501.16335v4 Announce Type: replace Abstract: Quantum information scrambling (QIS) describes the rapid spread of initially localized information across an entire quantum many-body system through entanglement generation. Once scrambled, the original local information becomes encoded globally,
Read full article →arXiv:2502.02491v2 Announce Type: replace Abstract: We consider the quantum analog of the generalized Zernike systems given by the Hamiltonian: $$\hat{\mathcal{H}}_N =\hat{p}_1^2+\hat{p}_2^2+\sum_{k=1}^N \gamma_k (\hat{q}_1 \hat{p}_1+\hat{q}_2 \hat{p}_2)^k ,$$ with canonical operators $\hat{q}_i,\,
Read full article →arXiv:2503.11785v3 Announce Type: replace Abstract: Quantum error mitigation (QEM) has emerged as a powerful tool for the extraction of useful quantum information from quantum devices. Here, we introduce the Subspace Noise Tailoring (SNT) algorithm, which efficiently combines the cheap cost of Symm
Read full article →arXiv:2505.19723v4 Announce Type: replace Abstract: Superposed coherent states are central to quantum technologies, yet their reliable identification remains a challenge, especially in noisy or resource-constrained settings. We introduce a novel, directly measurable criterion for detecting cat-like
Read full article →arXiv:2507.07249v2 Announce Type: replace Abstract: The fluctuation-dissipation theorem (FDT) is a fundamental result in statistical mechanics. It stipulates that, if perturbed out of equilibrium, a system responds at a rate proportional to a thermal-equilibrium property. Applications range from pa
Read full article →arXiv:2507.23787v2 Announce Type: replace Abstract: We prove that the generic quantum speedups for brute-force search and counting only hold when the process we apply them to can be efficiently inverted. The algorithms speeding up these problems, amplitude amplification and amplitude estimation, as
Read full article →arXiv:2508.00055v2 Announce Type: replace Abstract: Many quantum algorithms, to compute some property of a unitary $U$, require access not just to $U$, but to $cU$, the unitary with a control qubit. We show that having access to $cU$ does not help for a large class of quantum problems. For a quantu
Read full article →arXiv:2508.10660v2 Announce Type: replace Abstract: We explore the potential application of quantum annealing to address the protein structure problem. To this end, we compare several proposed ab initio protein folding models for quantum computers and analyze their scaling and performance for class
Read full article →arXiv:2508.14583v2 Announce Type: replace Abstract: The quantum theory of relativistic particles, based on the first quantization technique similar to that used by Schroedinger and Dirac in formulating quantum mechanics, is reconsidered on the basis of a photon-like dispersion relation correspondin
Read full article →arXiv:2508.18147v2 Announce Type: replace Abstract: Molecular docking is a critical computational method in drug discovery used to predict the binding conformation and orientation of a ligand within a protein's binding site. Mapping this challenge onto a graph-based problem, specifically the Maximu
Read full article →arXiv:2509.06873v3 Announce Type: replace Abstract: Quantum Machine Learning (QML) has emerged as a promising framework for exploring how quantum dynamics may enhance data processing tasks. Here we investigate Quantum Extreme Learning Machines (QELMs), a quantum analogue of classical Extreme Learni
Read full article →arXiv:2509.15483v2 Announce Type: replace Abstract: Extracting momentum-resolved excitation spectra in strongly correlated quantum systems remains a major challenge, especially beyond one spatial dimension. We present an efficient tensor-network approach to compute dispersion relations via imaginar
Read full article →arXiv:2510.20046v3 Announce Type: replace Abstract: Solvable bosonic models provide a fundamental framework for describing light propagation in nonlinear media, including optical down-conversion processes that generate squeezed states of light and their higher-order generalizations. In quantum opti
Read full article →arXiv:2511.19687v2 Announce Type: replace Abstract: Absorption spectroscopy is a fundamental tool for probing molecular structure. However, performing absorption spectroscopy on individual molecules is challenging due to the low signal-to-noise ratio. Here, we report on a nondestructive absorption
Read full article →arXiv:2511.20026v2 Announce Type: replace Abstract: Fast coherent state transport is essential to quantum computation and quantum information processing. While an adiabatic transport of atomic qubits guarantees a high fidelity of the state preparation, it requires a long timescale that defies effic
Read full article →arXiv:2512.09007v2 Announce Type: replace Abstract: In this paper, a method is developed for the study of a generic small central quantum system, which is locally coupled to an environment as a many-body quantum chaotic system that satisfies the eigenstate thermalization hypothesis (ETH) ansatz. Th
Read full article →arXiv:2512.14302v2 Announce Type: replace Abstract: Multipartite nonlocality has been extensively investigated within one-dimensional quantum lattices. Previous research has primarily focused on the nonlocality measure $S$, which quantifies the violation of Bell-type inequalities. However, the opti
Read full article →arXiv:2512.16197v2 Announce Type: replace Abstract: Color centers hosted in hexagonal boron nitride have emerged as a highly promising platform for single-photon emission and spin-photon technologies relevant to quantum communication and quantum networking. As a wide-bandgap van der Waals material,
Read full article →arXiv:2601.03230v2 Announce Type: replace Abstract: We show that excitons coupled to cavity photons and phonons admit a generalized Bloch theorem when formulated for the conserved total crystal momentum. In minimal-coupling and Fr\"ohlich representations, the interchange of momenta between fermions
Read full article →arXiv:2603.15190v2 Announce Type: replace Abstract: We study the error-correction properties of multi-mode Fock-state codes under amplitude-damping (AD) noise, focusing on the asymptotic regime in which the total excitation of the code states grows without limit and the number of photon losses indu
Read full article →arXiv:2603.15515v3 Announce Type: replace Abstract: Solving large-scale sparse linear systems is a challenging computational task due to the introduction of non-zero elements, or "fill-in." The Graph Partitioning Problem (GPP) arises naturally when minimizing fill-in and accelerating solvers. In th
Read full article →arXiv:2603.24237v2 Announce Type: replace Abstract: Atom loss is a dominant error source in neutral-atom quantum processors, yet its correlated structure remains largely unexploited by existing quantum error correction decoders. We analyze the performance of the surface code equipped with teleporta
Read full article →arXiv:2603.29439v4 Announce Type: replace Abstract: Superconducting quantum processor units (QPUs) are incapable of producing massive datasets for quantum error correction (QEC) because of hardware limitations. Thus, QEC decoders heavily depend on synthetic data from qubit error models. Classic dep
Read full article →arXiv:2604.06461v2 Announce Type: replace Abstract: We introduce a systematic protocol for constructing quantum Hilbert-space-fragmented Hamiltonians, whose Krylov-sector structure, unlike in classically fragmented models, can be fully resolved only in an entangled basis. The protocol takes as inpu
Read full article →arXiv:2604.08367v2 Announce Type: replace Abstract: The Quantum Approximate Optimization Algorithm (QAOA) has emerged as a promising approach for addressing combinatorial optimization problems on near-term quantum hardware. In this work, we conduct an empirical evaluation of QAOA on the Max-Cut pro
Read full article →arXiv:2604.09196v3 Announce Type: replace Abstract: The standard stimulated Raman adiabatic passage (STIRAP) protocol enables high-fidelity quantum state transfer in an ideal three-level system via adiabatic following of a dark state evolution. However, in practical systems with more energy levels,
Read full article →arXiv:2604.09775v2 Announce Type: replace Abstract: Distributed quantum computing offers a promising approach to scaling quantum devices by networking multiple quantum processors. We present a quantum state tomography protocol tailored for distributed quantum computers that avoids assuming remote e
Read full article →arXiv:2604.14224v2 Announce Type: replace Abstract: A time-integrated measure of complexity is proposed for diagnosing the degree of quantum ergodicity. The scrambling dynamics of maximally entangled states within the ensemble of unitary evolutions are quantified by applying numerical bootstrapped
Read full article →arXiv:2604.20838v2 Announce Type: replace Abstract: We construct a quantum low-density parity-check code family from a length-$512$ Calderbank--Shor--Steane base matrix pair. The base pair is permutation-equivalent to the known SPC(3) product CSS code, and the present affine-coset description gives
Read full article →arXiv:2604.21594v2 Announce Type: replace Abstract: Systematic control errors remain a primary obstacle to realizing high-fidelity single-qubit gates. We introduce composite pulse sequences that implement X and Hadamard gates while simultaneously compensating amplitude (Rabi-frequency), detuning (f
Read full article →arXiv:2412.19780v2 Announce Type: replace-cross Abstract: Tensor networks are a tool first employed in the context of many-body quantum physics that now have a wide range of uses across the computational sciences, from numerical methods to machine learning. Methods integrating tensor networks into
Read full article →arXiv:2503.15811v2 Announce Type: replace-cross Abstract: The variational determination of the two-boson reduced density matrix is described for a one-dimensional system of $N$ (where $N$ ranges from $2$ to $10^4$) harmonically trapped bosons interacting via contact interaction. The ground-state en
Read full article →arXiv:2503.21437v2 Announce Type: replace-cross Abstract: Technological understanding is not a singular concept but varies depending on context. Building on De Jong and De Haro's (2025) notion of technological understanding as the ability to realise an aim through the use of a technological artefac
Read full article →arXiv:2505.16913v3 Announce Type: replace-cross Abstract: We consider a free quantum particle in one dimension whose mass profile exhibits jump discontinuities. The corresponding Hamiltonian is a self-adjoint realisation of the kinetic-energy operator, with the specific realisation determined by th
Read full article →arXiv:2510.05242v3 Announce Type: replace-cross Abstract: Bound electron-hole pairs in semiconductors known as excitons are the subject of intense research due to their potential for optoelectronic devices and applications, especially in the realm of two-dimensional materials. While the properties
Read full article →arXiv:2512.02798v2 Announce Type: replace-cross Abstract: Single-photon sources based on neutral or charged excitons in a semiconductor quantum dot are attractive resources for photonic quantum computers and simulators. To obtain indistinguishable photons, the source is pumped on resonance with pol
Read full article →arXiv:2602.20376v2 Announce Type: replace-cross Abstract: We approach the Max-3-Cut problem through the lens of maximizing complex-valued quadratic forms and demonstrate that low-rank structure in the objective matrix can be exploited, leading to alternative algorithms to classical semidefinite pro
Read full article →arXiv:2602.21468v5 Announce Type: replace-cross Abstract: The spin-$1/2$ $J_1$-$J_2$ Heisenberg model on the square lattice exhibits a debated intermediate phase between N\'eel antiferromagnetic and stripe ordered regimes, with competing theories proposing plaquette valence bond, nematic, and quant
Read full article →arXiv:2603.19381v2 Announce Type: replace-cross Abstract: Modulated symmetries are internal symmetries that act in a spatially non-uniform manner. Consequently, when a modulated symmetry $G_{\text{int}}$ is combined with a spatial symmetry $G_{\text{sp}}$, the total symmetry group takes the form of
Read full article →arXiv:2604.00037v2 Announce Type: replace-cross Abstract: Tensor trains (TTs), also known as matrix product states (MPS), are compressed representations of high-dimensional data that can be efficiently manipulated to perform calculations on the data. In many applications, such as TT-based solvers f
Read full article →arXiv:2604.03669v2 Announce Type: replace-cross Abstract: The statistics of gaps between quantum energy levels is a hallmark criterion in quantum chaos and quantum integrability studies. The relevant distributions corresponding to exactly integrable vs. fully chaotic systems are universal and descr
Read full article →arXiv:2604.11596v2 Announce Type: replace-cross Abstract: A spectrally isolated quartet can admit a local two-qubit description at each point in parameter space and still acquire a loop holonomy outside the local subgroup $\mathrm{U}(2)\otimes\mathrm{U}(2)$. We study this question in three localize
Read full article →arXiv:2604.21857v2 Announce Type: replace-cross Abstract: New sources of charge-parity (CP) violation beyond those described in the Standard Model (SM) are required to explain the observed matter--antimatter asymmetry of the Universe. The Standard Model Effective Field Theory (SMEFT) provides a fra
Read full article →npj Quantum Information, Published online: 24 April 2026; doi:10.1038/s41534-026-01242-xEfficient post-selection for general quantum LDPC Codes
Read full article →npj Quantum Information, Published online: 24 April 2026; doi:10.1038/s41534-026-01243-wPlacing and routing quantum LDPC codes in multilayer superconducting hardware
Read full article →npj Quantum Information, Published online: 24 April 2026; doi:10.1038/s41534-026-01248-5Near-term fermionic simulation with subspace noise tailored quantum error mitigation
Read full article →npj Quantum Information, Published online: 22 April 2026; doi:10.1038/s41534-026-01241-ySurface-code hardware Hamiltonian
Read full article →npj Quantum Information, Published online: 21 April 2026; doi:10.1038/s41534-026-01247-6Distributed quantum inner product estimation with structured random circuits
Read full article →npj Quantum Information, Published online: 21 April 2026; doi:10.1038/s41534-026-01221-2Two-qubit gates using on-demand single-photons from ordered shape and size controlled large-volume superradiant quantum dots
Read full article →npj Quantum Information, Published online: 17 April 2026; doi:10.1038/s41534-026-01228-9Collective purification of interacting quantum networks beyond symmetry constraints
Read full article →npj Quantum Information, Published online: 17 April 2026; doi:10.1038/s41534-026-01229-8Quantum reservoir computing induced by controllable damping
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