Quantum Research
QUANTUM RESEARCH

Quantum Research

Cutting-edge research papers, preprints, and scientific breakthroughs.

Last updated: Jun 01, 2026 at 07:00 UTC
Quantum Entanglement
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A flower-like pattern exposes chiral superconductivity's long-sought fingerprint
Phys.org Apr 29, 2026

Scientists used a few tiny tin atoms to find a special kind of superpower called superconductivity, where electricity flows without any resistance. It's like discovering a new secret way to make electricity travel super fast and easy. This helps us build amazing new materials for future technology!

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Frozen in dry ice, hydrogen reveals a surprisingly simple way to control quantum behavior
Phys.org Apr 29, 2026

Scientists found a way to control tiny parts of hydrogen by freezing it in dry ice, which is super cold. This is important because it can help us store energy better, make faster computers, and learn about space in new ways. It’s like using ice to pause and control something really small and powerful!

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Physicists reveal universal speed limit on quantum information scrambling
Phys.org Apr 29, 2026

Scientists found that there is a fastest speed at which special tiny information, called quantum information, can spread. This speed depends on how "mixed up" and warm the system is, kind of like how heat moves faster in some things than others. Knowing this helps us understand how information moves in super small and strange places, which can be important for future technology.

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Light can now be shaped in empty space, and it could simplify sensing and boost data links
Phys.org Apr 28, 2026

Scientists found a new way to change how light moves without using any mirrors or lenses. This is like twisting a flashlight beam just by waving your hand in the air. It could help doctors test patients faster and make internet connections work better in the future.

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This ultracold quantum device turns electricity into something far stranger that could unlock sound-based lasers
Phys.org Apr 27, 2026

Scientists made a special machine that works in super cold places and can create tiny sound particles called phonons. These phonons are like tiny waves of sound that could help make new kinds of lasers. This is important because these sound lasers might help us talk better or find problems inside our bodies.

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Single X-ray photons reveal hidden light-matter interactions in 50-nanometer double slits
Phys.org Apr 27, 2026

Scientists used tiny beams of special light called X-rays to see how light bends when it passes through super small gaps, much smaller than a hair. This helps us understand how light and tiny particles interact, which is important for new technologies like better screens and faster internet. It’s like discovering a secret trick that light uses to travel and change!

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Quantum 'dark modes' no longer block phonon control, opening new paths for scalable devices
Phys.org Apr 24, 2026

Scientists found a way to fix a problem that was stopping tiny vibrations, called phonons, from being controlled in special quantum machines. This is important because it helps make better devices that can store and send information in new, powerful ways. It’s like finding a way to turn on a light that was always stuck in the dark!

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Quantum-classical embedding via ghost Gutzwiller approximation for enhanced simulations of correlated electron systems
Nature May 4, 2026

Scientists found a new way to use both regular and quantum computers together to better study tiny particles called electrons. This helps them understand how electrons work when they stick close and affect each other a lot. Learning this can help make new materials and technology in the future!

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Multi-dimensional frequency-bin entanglement-based quantum key distribution network
Nature Apr 29, 2026

Scientists have made a new way to send secret messages using tiny particles of light that are connected in a special way called "entanglement." This helps keep information super safe, like having a secret code that only you and your friend can understand. It’s important because it can help protect our messages from being hacked in the future.

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Scaffold-assisted window junctions for superconducting qubit fabrication
Nature Apr 28, 2026

Scientists are making tiny parts called qubits that help computers think in a new, super-fast way. They found a clever way to build these parts using a special “window” and a strong frame, like putting a picture in a sturdy frame to keep it safe. This helps make better quantum computers that could solve big problems faster than regular computers.

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Efficient post-selection for general quantum LDPC Codes
Nature Apr 24, 2026

Scientists have found a better way to fix mistakes in special kinds of super-smart computers called quantum computers. This helps the computers work faster and more accurately, just like how checking your homework carefully can help you get better grades. This is important because it brings us closer to using quantum computers to solve big problems in the future.

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Placing and routing quantum LDPC codes in multilayer superconducting hardware
Nature Apr 24, 2026

Scientists are working on special computer codes that help fix mistakes in tiny, super-powerful computers called quantum computers. They found a new way to arrange these codes inside layers of special materials that can carry electricity without losing energy. This helps make quantum computers work better and faster, which could one day solve really hard problems.

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Near-term fermionic simulation with subspace noise tailored quantum error mitigation
Nature Apr 24, 2026

Quantum computers can help us understand tiny particles called fermions, which are like the building blocks of everything around us. But these computers sometimes make mistakes, like a game with glitches. Scientists found a new way to fix these mistakes so the computer can give better answers faster.

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Surface-code hardware Hamiltonian
Nature Apr 22, 2026

Quantum computers use tiny parts called qubits to solve problems much faster than regular computers. Scientists are working on special ways to keep qubits safe from mistakes, like building a strong fence around a playground. This helps make quantum computers more reliable and powerful in the future.

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Distributed quantum inner product estimation with structured random circuits
Nature Apr 21, 2026

Quantum computers use tiny particles to solve problems faster than regular computers. This new idea helps many small quantum computers work together like a team to solve tricky puzzles. It’s important because it can make quantum computers even better and help us learn new things faster.

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Which Coherence Decoheres? Basis-Dependent Decoherence Rates in Symmetry-Broken Collective Spin Systems
arXiv May 5, 2026

Imagine you have a bunch of tiny spinning tops that can be lined up in different ways. Scientists found that depending on how you look at these spins, they lose their special “quantum memory” at different speeds. This is important because understanding how and why this happens helps us build better quantum computers that can remember information longer.

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Multiple Bulk-Boundary Correspondences and Anomalous Modes in a Non-Hermitian Creutz Ladder
arXiv May 5, 2026

Scientists studied a special kind of system where energy can be gained or lost, and things don’t behave the same going one way or the other. They found surprising ways that certain waves or signals stick to the edges or spread out in the system, kind of like how water might flow differently on a tilted or bumpy surface. This helps us understand new kinds of materials and could lead to better technology in the future!

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Gravity-induced Entanglement under Constrained Dynamics
arXiv May 5, 2026

Scientists are finding new ways to test how gravity might connect tiny particles in a special way called entanglement, which is like a secret link between them. They discovered that even when particles aren’t falling freely but are moving in a controlled way, gravity can still create this link. This is important because it makes it easier to do experiments that help us understand how gravity works with the tiny building blocks of the universe.

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Sheaf-Theoretic Preparation Contextuality
arXiv May 5, 2026

Quantum computers work in a very different way from regular computers. This new idea helps scientists understand how certain ways of getting information in quantum computers don’t fit together like pieces of a normal puzzle. Knowing this helps us learn more about how quantum computers can do special things that regular computers can’t.

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Universality of Quantum Gates in Particle and Symmetry Constrained Subspaces
arXiv May 5, 2026

Quantum computers use special steps called gates to change tiny particles in a controlled way. This work shows that certain easy-to-make gates can create any possible state, even when there are rules like keeping the same number of particles. This is important because it helps scientists use quantum computers to study hard problems in physics and chemistry more easily.

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The minimal example of quantum network Bell nonlocality
arXiv May 5, 2026

Imagine you have three friends sitting far apart, and they each get a secret message from different places. Even though they don't talk to each other, the messages are connected in a special way that only quantum physics can explain. This discovery helps us understand how tiny particles can share information in surprising ways, which could make future computers and communication much faster and safer.

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Multimode Strong-Coupling Processes in Circuit QED Lattices
arXiv May 5, 2026

Scientists are studying tiny circuits that can hold and control particles of light, called photons, which can work together in new ways. This helps them learn how to make super-fast computers that use special bits called qubits, which can do many things at once. Understanding these special light and qubit interactions could help build better quantum computers in the future!

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A Scalable FPGA Architecture for Real-Time Decoding of Quantum LDPC Codes Using GARI
arXiv May 5, 2026

Scientists made a new kind of computer helper that fixes mistakes in quantum computers faster and using less energy. This helper works like a smart messenger that quickly finds and corrects errors so the quantum computer can work better. This is important because it helps make super-powerful quantum computers more reliable and easier to build in the future.

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Entropic Reciprocity in Time-Reversed Young Interferometry
arXiv May 5, 2026

Imagine shining light through two tiny openings to make a pattern of bright and dark spots, like shadows. Scientists found that if you play this light pattern backward in time, it doesn’t just rewind—it changes how information about the light’s source is shared with the detector. This helps us understand light and information better, which could be important for future technology that uses light in smart ways.

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On Quantum Indeterminacy
arXiv May 5, 2026

Quantum indeterminacy means we can’t know everything about tiny particles at the same time, like where they are and how fast they’re moving. This new idea shows that this mystery comes from the shape and rules of a special space where these particles live, not just from guessing or measuring. It helps us understand that the universe has built-in limits on what we can know, which is important for making super-powerful computers called quantum computers.

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Impact-Driven Quantum Decomposition for Traffic Zone Partitioning: A Hybrid Gate-Model Framework
arXiv May 5, 2026

Scientists found a new way to use both regular computers and tiny quantum computers together to help sort busy roads into smart zones. This is important because it helps traffic flow better and makes traveling easier. Think of it like using a team where each player does the job they are best at to solve a big puzzle faster.

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Low-cost Ultra-low Noise DAC System-on-Module for Scalable Ion-Trap Electrode Control
arXiv May 5, 2026

Scientists made a new, affordable tool that helps control tiny electric parts called ion traps. These ion traps are important for building super-powerful computers called quantum computers. This tool works quietly and can be used in many experiments, making it easier and cheaper to build these special computers.

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Crossing the 12,000-atom barrier with heterogeneous quantum-classical supercomputing: quantum chemistry of protein-ligand complexes
arXiv May 5, 2026

Scientists have found a way to use super-powerful computers and tiny quantum machines to study really big molecules, like parts of proteins, more accurately than before. This helps us understand how molecules work together, which is important for things like making new medicines. It’s like using a super detailed map to explore a huge city instead of just looking at a small neighborhood!

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ADaPT: Adaptive-window Decoding for Practical fault-Tolerance
arXiv May 5, 2026

Scientists have made a new way to help quantum computers fix their mistakes faster. This is like having a smart helper who only checks the parts that need fixing instead of looking at everything all the time. This helps quantum computers work better and makes them more reliable for solving big problems.

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A Quantum Approach to Stochastic Optimization in Insurance Underwriting
arXiv May 5, 2026

Scientists are using special new computers called quantum computers to solve tricky problems where there’s a lot of guessing and chance, like figuring out the best way to pick things when the weights can change. This is important because it helps insurance companies make smarter choices even when things are uncertain. Quantum computers can work together with regular computers to find better answers faster than before!

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Extending UNIQuE: Quantum Simulation Speedup for the HHL Algorithm
arXiv Apr 29, 2026

arXiv:2604.25148v1 Announce Type: new Abstract: In an extension of the Unconventional Noiseless Intermediate Quantum Emulator, this work introduces a classical emulation of the quantum Harrow-Hassidim-Lloyd algorithm for sampling from the solution space of linear systems. The emulated HHL algorithm

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Experimental Workflows for Combinatorial Optimization: Towards Quantum Advantage
arXiv Apr 29, 2026

arXiv:2604.25162v1 Announce Type: new Abstract: Demonstrating quantum advantage for combinatorial optimization requires more than standalone algorithmic results; it calls for end-to-end case studies that integrate problem modelling, quantum execution, and classical refinement into practical workflo

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Spectral tuning of single T centres by the Stark effect
arXiv Apr 29, 2026

arXiv:2604.25170v1 Announce Type: new Abstract: Among the many solid-state emitters being explored for scalable quantum technologies, the silicon T centre is a leading candidate offering long-lived spin qubits, a telecommunications-band spin-photon interface, and integration with on-chip photonic c

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Quantum-enhanced Network Tomography
arXiv Apr 29, 2026

arXiv:2604.25194v1 Announce Type: new Abstract: Network tomography refers to the use of inference techniques for inferring internal network states from end-to-end probes. Quantum probes, implemented by sending blocks of $n$ coherent-state pulses augmented with continuous-variable (CV) squeezing ($n

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A simple method to fabricate Josephson junctions
arXiv Apr 29, 2026

arXiv:2604.25195v1 Announce Type: new Abstract: A minimal method to fabricate Al/AlO$_x$/Al Josephson junctions (JJs) using photolithography and argon etching, before metallization and oxidation, is demonstrated. JJs with areas ranging from 1 to 6 $\mu$m$^2$ can be fabricated and, with the appropri

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Semi-transmitter-device-independent quantum key distribution
arXiv Apr 29, 2026

arXiv:2604.25225v1 Announce Type: new Abstract: Transmitter-device-dependence is a longstanding but often implicit problem in quantum key distribution (QKD), as compared to measurement-device-dependence. One-sided device-independent (1sDI) scenario relaxes the security conditions of DI framework an

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Hardware Realization of a Hamiltonian Simulation Algorithm for Time-Domain Maxwells Equations
arXiv Apr 29, 2026

arXiv:2604.25229v1 Announce Type: new Abstract: We present the first quantum-hardware implementation of a Hamiltonian simulation algorithm that produces signed vector-field solutions to the time-domain Maxwells equations using a Schrodingerisation-based approach.The electromagnetic fields are discr

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Graph-Conditioned Meta-Optimizer for QAOA Parameter Generation on Multiple Problem Classes
arXiv Apr 29, 2026

arXiv:2604.25275v1 Announce Type: new Abstract: We study parameter transferability for the Quantum Approximate Optimization Algorithm (QAOA) across multiple combinatorial optimization problem classes from a parameter generation perspective. Specifically, a meta-optimizer is trained on one problem c

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Nonlinearity-enhanced Quantum Sensing in Discrete Time Crystal Probes
arXiv Apr 29, 2026

arXiv:2604.25286v1 Announce Type: new Abstract: Discrete time crystals are non-equilibrium phases of matter in periodically driven systems, characterized by robust subharmonic oscillations and broken discrete time-translation symmetry. Their long-lived coherent dynamics and resilience to imperfecti

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Millikelvin digital-to-analog converter for superconducting quantum processors
arXiv Apr 29, 2026

arXiv:2604.25303v1 Announce Type: new Abstract: Scaling superconducting quantum processors is increasingly constrained by the wiring, heat load, and calibration overhead associated with delivering high-resolution analog signals from room temperature to qubits at millikelvin temperature. Here we dem

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Entanglement Dynamics in a Two Transmon Qubit System under Continuous Measurement and Postselection
arXiv Apr 29, 2026

arXiv:2604.25311v1 Announce Type: new Abstract: We investigate the role of continuous measurement and postselection in the dynamics and entanglement of a transmon-cavity-transmon coupled system. In the dispersive regime, characterized by a large detuning between the transmons and the cavity, the tw

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Sign Embedding Quantum Algorithms for Matrix Equations and Matrix Functions
arXiv Apr 29, 2026

arXiv:2604.25333v1 Announce Type: new Abstract: We develop a systematic sign-embedding framework of operator-output quantum algorithms for matrix equations and matrix functions. Differing from the contour-integral treatment, we start with the matrix-sign embedding route: an augmented matrix $M$ who

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A graph-aware bounded distance decoder for all stabilizer codes
arXiv Apr 29, 2026

arXiv:2604.25424v1 Announce Type: new Abstract: We formulate a bounded distance decoding strategy applicable to all stabilizer codes including both CSS and non-CSS code-families. The framework emerges out of the local Clifford equivalence between arbitrary stabilizer states and graph states. Using

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Elucidating mechanism of optical cavities in superconducting strip single photon detectors using transmission line and impedance models
arXiv Apr 29, 2026

arXiv:2604.25425v1 Announce Type: new Abstract: We clarified the physical mechanism of superconducting strip single photon detectors (SSPDs) with optical cavities by using transmission line and impedance models. By introducing the transmission line model, we derived the analytical formulae for the

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Ember: An Extensible Benchmark Suite for Quantum Annealing Embedding Algorithms
arXiv Apr 29, 2026

arXiv:2604.25433v1 Announce Type: new Abstract: Minor embedding is a required compilation step for quantum annealing, mapping logical problem graphs onto sparse hardware topologies. Despite its central role in determining solution quality, no standardized benchmark exists for comparing embedding al

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Quantum Compressed Sensing Enables Image Classification with a Single Photon
arXiv Apr 29, 2026

arXiv:2604.25480v1 Announce Type: new Abstract: Image classification is a core task of intelligent sensing, conventionally follows a sequential imaging then processing pipeline. However, redundant high-dimensional image reconstruction is inherently inefficient, especially in photon limited scenario

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Sector-dominant graph-local drivers for path-window barrier Hamiltonians on the Boolean hypercube
arXiv Apr 29, 2026

arXiv:2604.25494v1 Announce Type: new Abstract: We study finite-size adiabatic state preparation on Boolean hypercubes using graph-local drivers built from sector/path coordinates related to monotone Gray-code representatives. The construction is not presented as a new all-$n$ Gray-code existence t

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Quantum-Accelerated Gowers $U_2$ Norm for Bent Boolean Functions
arXiv Apr 29, 2026

arXiv:2604.25503v1 Announce Type: new Abstract: Bent Boolean functions extremal objects that maximally resist affine approximation are notoriously hard to construct for large numbers of variables. We propose a hybrid quantum-classical genetic algorithm (GA) that uses a \emph{quantum circuit}

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Simon's Algorithm for the Even-Mansour Cipher on Quantum Hardware
arXiv Apr 29, 2026

arXiv:2604.25509v1 Announce Type: new Abstract: Simon's algorithm is a polynomial period-finding algorithm that has been used to exploit the algebraic structure of specific symmetric ciphers, showing that exponential speedups in their cryptanalysis are theoretically possible. While the theoretical

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Defect-Adaptive Lattice Surgery on Irregular Boundary Surface-Code Patches
arXiv Apr 29, 2026

arXiv:2604.25524v1 Announce Type: new Abstract: Defect-adaptive surface-code methods have substantially advanced the construction of valid logical patches on imperfect hardware, but fault-tolerant computation also requires executable logical oper ations on the resulting irregular geometries. We for

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Quantum Optimization Methods for the Generalized Traveling Salesman Problem
arXiv Apr 29, 2026

arXiv:2604.25531v1 Announce Type: new Abstract: This paper studies quantum optimization baselines for the Generalized Traveling Salesman Problem (GTSP), a clustered routing problem that naturally models variant selection and sequencing problems under discrete alternatives. We propose a novel GTSP Q

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Bond-dimension scaling of a local-refinement advantage over hyperoptimized tensor-network contraction on Sycamore like topologies
arXiv Apr 29, 2026

arXiv:2604.25532v1 Announce Type: new Abstract: We identify a missing local-refinement stage in the cotengra tensor-network contraction pipeline and show that its impact grows monotonically with bond dimension on the \emph{connectivity graph} of Sycamore-like topologies. Appending a nearest-neighbo

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Quantum annealing inspired algorithms for the NISQ Era
arXiv Apr 29, 2026

arXiv:2604.25573v1 Announce Type: new Abstract: We study algorithms inspired by quantum annealing that are suited for the NISQ era. First, we analyze approximate quantum annealing (AQA), which employs a discretized annealing ansatz in which the time step and the number of layers are allowed to devi

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Optimizing ground state preparation protocols with autoresearch
arXiv Apr 29, 2026

arXiv:2604.25610v1 Announce Type: new Abstract: Artificial intelligent language-model based coding agents have significantly changed the way we interact with computers in our day-to-day, as it is common to use them to create, improve, and run programming scripts only using natural language. Agent c

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One Coordinate at a Time: Convergence Guarantees for Rotosolve in Variational Quantum Algorithms
arXiv Apr 29, 2026

arXiv:2604.25613v1 Announce Type: new Abstract: In this paper, we resolve an open question in the field of optimization algorithms for training parametrized quantum circuits: Does the popular Rotosolve algorithm converge? Until now, interpolation-based coordinate descent methods such as Rotosolve h

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Near-identical photons from distant quantum dot-cavity devices
arXiv Apr 29, 2026

arXiv:2604.25615v1 Announce Type: new Abstract: Scalable optical quantum technologies require interference between large numbers of indistinguishable single-photons emitted by independent sources. Semiconductor quantum dots are known to be excellent on-demand sources of single-photons. They show re

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Robustness of fiber-optic attenuators to 1061-nm sub-nanosecond pulsed laser radiation in quantum key distribution systems
arXiv Apr 29, 2026

arXiv:2604.25620v1 Announce Type: new Abstract: The security of quantum key distribution (QKD) systems relies on the physical integrity of their components. While laser-damage attacks (LDAs) using high-power continuous-wave (cw) lasers have been well studied, the threat posed by pulsed lasers at al

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Local tensor-train surrogates for quantum learning models
arXiv Apr 29, 2026

arXiv:2604.25631v1 Announce Type: new Abstract: A key bottleneck in quantum machine learning is the computational cost of repeated quantum circuit evaluations during the inference phase. To address this, we present a framework for constructing fast, cheap, provably accurate classical tensor-train s

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Continuous Reset-Induced Phase Transition in Measurement-Free Random Quantum Circuits
arXiv Apr 29, 2026

arXiv:2604.25640v1 Announce Type: new Abstract: We study a random unitary quantum circuit with only reset channels, which has high feasibility for real quantum devices. In particular, we investigate the many-body statistical physics properties, "reset-induced" entanglement phase transitions compari

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Efficient Complex-Valued State Preparation on Bucket Brigade QRAM
arXiv Apr 29, 2026

arXiv:2604.25644v1 Announce Type: new Abstract: Efficient quantum state preparation is a critical component in quantum algorithms that process large classical data, and it is fundamental to realizing quantum advantage in domains such as machine learning, quantum linear algebra, and quantum finance.

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Nanoscale Sensing of Solid-State Samples with High Frequency Resolution
arXiv Apr 29, 2026

arXiv:2604.25660v1 Announce Type: new Abstract: To meet the growing demand for nanoscale surface analysis, nitrogen-vacancy (NV) centers offer a high-sensitivity alternative by leveraging their ability to operate in immediate proximity to the sample. In this work, we propose a quantum control proto

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Quantum memory and scrambling from the perspective of a classical neural network
arXiv Apr 29, 2026

arXiv:2604.25663v1 Announce Type: new Abstract: Entropic uncertainty relations are universal quantifiers of fundamental uncertainties of quantum measurements and are widely discussed in the quantum metrology literature. Quantum memory is a phenomenon related to the specific type of quantum correlat

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Universal Characterization of Classical Qubit Noise
arXiv Apr 29, 2026

arXiv:2604.25705v1 Announce Type: new Abstract: We propose a general method to fully characterize a classical stochastic noise process causing qubit dephasing through repetitive Ramsey interferometry measurements (RIMs) on the qubit. Compared to filter-function-based spectroscopy, our method does n

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Polynomial Resource Classification of Quantum Circuit Familes via Classical Shadows
arXiv Apr 29, 2026

arXiv:2604.25708v1 Announce Type: new Abstract: We compare four polynomial-resource measurement strategies, (I) $Z$-basis-only, (II) nearest-neighbor $ZZ$ (NN), (III) multi-basis ($Z$, $X$, $Y$), and (IV) classical shadows, for classifying three quantum circuit families: IQP, Clifford, and Clifford

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Ground-state energies of Ising models calculated using the samples from a quantum computer that simulates short-time evolution
arXiv Apr 29, 2026

arXiv:2604.25715v1 Announce Type: new Abstract: We find the ground-state energy of the Ising model using the Cascaded Variational Quantum Eigensolver (CVQE) algorithm with the Guided-Sampling Ansatz (GSA) using up to 63 qubits on a quantum computer. We study a heavy-hex lattice to match the qubit a

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Quantum Error Correction Exploiting Quantum Spatial Distribution and Gauge Symmetry
arXiv Apr 29, 2026

arXiv:2604.25747v1 Announce Type: new Abstract: We explore what the integrated use of quantum spatial distribution (QSD), or more specifically, superposition of both spin and position states of particles, and gauge symmetry (GS) within stabilizer formalism provides for quantum error correction. The

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Numerically-Exact Quantum-Simulation Approach for Two-Dimensional Spectroscopy of Open Quantum Systems
arXiv Apr 29, 2026

arXiv:2604.25753v1 Announce Type: new Abstract: Two-dimensional spectroscopy (2DS) is a powerful ultrafast technique for probing electronic and vibrational dynamics in complex microscopic systems. Extracting detailed information on system dynamics and system-bath interactions from 2DS experiments r

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Quantum-Inspired Robust and Scalable SAR Object Classification
arXiv Apr 29, 2026

arXiv:2604.25755v1 Announce Type: new Abstract: SAR image classification naturally has to deal with huge noise and a high dynamic range particularly requiring robust classification models. Additionally, the deployment of these models on edge devices, such as drones and military aircraft, requires a

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Beyond Single Trajectories: Optimal Control and Jordan-Lie Algebra in Hybrid Quantum Walks for Combinatorial Optimization
arXiv Apr 29, 2026

arXiv:2604.25760v1 Announce Type: new Abstract: The Quantum Approximate Optimization Algorithm (QAOA) follows a single, fixed evolution path, overlooking the potential computational advantage of coherently superposing multiple trajectories. Here we overcome this limitation with a hybrid quantum wal

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Pulse Quality Optimisation in Quantum Optimal Control
arXiv Apr 29, 2026

arXiv:2604.25768v1 Announce Type: new Abstract: Quantum optimal control methods are widely used to design experimental control pulses such as laser amplitudes, phases, or detunings, that implement a target unitary evolution. In practice, what makes a pulse "good" depends not only on its fidelity, b

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The mixed-dimensional quantum MacWilliams identity: bounds for codes and absolutely maximally entangled states in heterogeneous systems
arXiv Apr 29, 2026

arXiv:2604.25790v1 Announce Type: new Abstract: As emerging quantum architectures evolve into heterogeneous networks combining different physical substrates, such as qubits for logic and higher-dimensional qudits for robust communication, the traditional scalar metrics of quantum error correction b

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Pseudo-Hermiticity of the Nakajima-Zwanzig Projected Liouvillian in the Jaynes-Cummings Model
arXiv Apr 29, 2026

arXiv:2604.25801v1 Announce Type: new Abstract: The Nakajima-Zwanzig projected Liouvillian QLQ, the generator of the exact memory kernel in open quantum dynamics, is manifestly non-Hermitian yet has been reported to possess a purely real spectrum in the Jaynes-Cummings model -- an anomaly unexplain

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Proof of the Error Scaling for Universally Robust Dynamical Decoupling Sequences
arXiv Apr 29, 2026

arXiv:2604.25807v1 Announce Type: new Abstract: Universally robust dynamical decoupling (UR$n$) sequences were proposed to compensate pulse imperfections arising from arbitrary experimental parameters while achieving high-order error suppression with only a linear increase in the number of pulses.

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A Quantum Spectral Framework for Solving PDEs
arXiv Apr 29, 2026

arXiv:2604.25825v1 Announce Type: new Abstract: Partial differential equations (PDEs) are fundamental across numerous scientific fields. As these problems scale to high dimensions, classical numerical schemes introduce severe computational bottlenecks, known as the curse of dimensionality. Attempts

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Quantum channels preserving sigma-additivity and Ulam measurable cardinals
arXiv Apr 29, 2026

arXiv:2604.25854v1 Announce Type: new Abstract: This paper investigates the interplay between the properties of quantum states on the Hilbert space \(\ell_2(\kappa)\) and the set-theoretic nature of the cardinal $\kappa$. We focus on the existence of singular $\sigma$-additive states~ -- function

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Minimum Toffoli depth for the multi-controlled Toffoli gate via teleportation
arXiv Apr 29, 2026

arXiv:2604.25861v1 Announce Type: new Abstract: The decomposition of complex quantum operations into experimentally feasible gate sets has been a central challenge since the early development of quantum computing. The multi-controlled Toffoli (MCT) gate is a key example, with applications across a

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MCMit: Mid-Circuit Measurement Error Mitigation
arXiv Apr 29, 2026

arXiv:2604.25863v1 Announce Type: new Abstract: Distributed Quantum Computing (DQC) and Quantum Error Correction (QEC) rely on dynamic circuits that include Mid-Circuit Measurements (MCMs) and classical feedback. These operations present a major bottleneck: MCMs suffer from high error rates that le

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Quantum limit cycles with continuous symmetries from coherent parametric driving: exact solutions and many-body extensions
arXiv Apr 29, 2026

arXiv:2604.25864v1 Announce Type: new Abstract: There is widespread interest in many-body quantum systems that exhibit limit-cycle or time-crystalline behaviour. An ideal quantum limit cycle would be realized using fully coherent driving (to minimize noise) and also have a continuous internal symme

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QCalEval: Benchmarking Vision-Language Models for Quantum Calibration Plot Understanding
arXiv Apr 29, 2026

arXiv:2604.25884v1 Announce Type: new Abstract: Quantum computing calibration depends on interpreting experimental data, and calibration plots provide the most universal human-readable representation for this task, yet no systematic evaluation exists of how well vision-language models (VLMs) interp

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Testing a continuous-variable Bell-like inequality with a hybrid-encoded system
arXiv Apr 29, 2026

arXiv:2604.25901v1 Announce Type: new Abstract: Continuous-variable quantum systems are promising candidates for quantum computing and quantum information processing. It is widely known that quadrature measurements on Gaussian continuous-variable systems can be described by a noncontextual hidden-v

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Heralding probability optimization for nonclassical light generated by photon counting measurements on multimode Gaussian states
arXiv Apr 29, 2026

arXiv:2604.25910v1 Announce Type: new Abstract: Generation of highly non-classical quantum states of light is essential for optical quantum information processing and quantum metrology. Given the lack of sufficiently strong nonlinear interactions between optical fields, the commonly employed optica

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Improved treatment of the $T_2$ molecular final-states uncertainties for the KATRIN neutrino-mass measurement
arXiv Apr 29, 2026

arXiv:2310.12634v1 Announce Type: cross Abstract: The KArlsruhe TRItium Neutrino experiment (KATRIN) aims to determine the effective mass of the electron antineutrino via a high-precision measurement of the tritium beta-decay spectrum in its end-point region. The target neutrino-mass sensitivity of

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Simultaneous Fragment Docking for Geometrically Linkable Pose Pairs
arXiv Apr 29, 2026

arXiv:2604.24773v1 Announce Type: cross Abstract: Computational molecular design requires binding arrangements that are not only energetically favorable but also chemically realizable. However, computational methods remain limited in directly recovering fragment pose pairs that can later be connect

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Multi-modes Bessel-Gaussian-Orbital Angular Momentum Beams Quantum Holography
arXiv Apr 29, 2026

arXiv:2604.24774v1 Announce Type: cross Abstract: We propose an orbital angular momentum (OAM) quantum holography scheme based on multi-mode Bessel-Gaussian (MBG) beams. Entangled photon pairs are generated through spontaneous parametric down-conversion (SPDC) process, and the axis prism parameters

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Query-Efficient Quantum Approximate Optimization via Graph-Conditioned Trust Regions
arXiv Apr 29, 2026

arXiv:2604.24803v1 Announce Type: cross Abstract: In low-depth implementations of the Quantum Approximate Optimization Algorithm (QAOA), the dominant cost is often the number of objective evaluations rather than circuit depth. We introduce a graph-conditioned trust-region method for reducing this q

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The Legacy of Enrico Fermi to Varenna
arXiv Apr 29, 2026

arXiv:2604.24829v1 Announce Type: cross Abstract: The Varenna school is a hub where generations of physicists, including numerous Nobel laureates, have shaped the field, often through collaborative exchanges across political and cultural boundaries. We examine the scientific legacy of Enrico Fermi

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The Classification of Pauli Stabilizer Codes: A Lattice and Continuum Treatise
arXiv Apr 29, 2026

arXiv:2604.24847v1 Announce Type: cross Abstract: We classify mobile Pauli stabilizer codes up to gapped interfaces and coarse-graining using the framework of algebraic $\mathrm{L}$-theory. We compare this classification with that of framed TQFTs, theories that arise naturally in the continuum, hig

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Six textbook mistakes in quantum field theory
arXiv Apr 29, 2026

arXiv:2604.24871v1 Announce Type: cross Abstract: This article discusses incorrect statements appearing in textbooks on quantum field theory (QFT); some of these mistakes also appear in the research literature. The focus is not on errors made by an individual author, but on conceptual muddledness t

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Phase diagram of a dual-species Rydberg atom ladder
arXiv Apr 29, 2026

arXiv:2604.24889v1 Announce Type: cross Abstract: Dual-species Rydberg atom arrays extend single-species platforms by introducing competing interaction scales and enhanced quantum fluctuations, enabling phenomena beyond homogeneous settings. In this work, we study the ground-state phase diagram of

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Tightening energy-based boson truncation bound using Monte Carlo-assisted methods
arXiv Apr 29, 2026

arXiv:2604.24896v1 Announce Type: cross Abstract: Quantum simulation offers a promising framework for quantum field theory calculations. Obtaining reliable results, however, requires careful characterization of systematic uncertainties. One important source is the boson truncation error, which aris

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Bridging the Quantum Divide: A Learning-Centric Quantum Hackathon for Underrepresented Students (Extended Version)
arXiv Apr 29, 2026

arXiv:2604.24995v1 Announce Type: cross Abstract: This paper describes the design and implementation of a two-day quantum hackathon for underrepresented high school students in Nova Scotia, Canada. The first day of the hackathon is spent introducing students to quantum computing through hands-on ac

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Hidden optical nonlinearities in linear spectra of quantum emitter arrays
arXiv Apr 29, 2026

arXiv:2604.25010v1 Announce Type: cross Abstract: Classical optical frameworks such as the discrete dipole approximation (DDA) assume that the linear spectrum of coupled quantum emitters can be computed solely from the linear susceptibilities of individual constituents. However, recent polariton st

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Determination of the Fermi Energy of Diamond using Photoluminescence Spectral Analysis
arXiv Apr 29, 2026

arXiv:2604.25097v1 Announce Type: cross Abstract: Electronic band structures and the Fermi energy provide essential information for understanding the electronic properties of solids. In semiconductors, the Fermi energy level is determined by the donor and acceptor concentrations. For diamond, the r

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USEQIP: Outcomes and experiences from 17 years of undergraduate summer schools in experimental quantum information science
arXiv Apr 29, 2026

arXiv:2604.25124v1 Announce Type: cross Abstract: To grow the quantum information science and technology workforce, opportunities for students to gain experiential learning and build a sense of belonging in the broader community are essential. The Undergraduate School on Experimental Quantum Inform

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Adaptive Sensing beyond Non-Adaptive Information Limits: End-to-End Co-Design of Geometry, Policy, and Inference
arXiv Apr 29, 2026

arXiv:2604.25193v1 Announce Type: cross Abstract: Inverse design has made vast physical parameter spaces a substrate for emergent behavior. In sensing, the stakes of this principle are sharpest at the analog-to-digital boundary, where any information the hardware fails to capture is information no

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Anomalous Mixed-State Floquet Topology in One-Dimensional Open Quantum Systems
arXiv Apr 29, 2026

arXiv:2604.25248v1 Announce Type: cross Abstract: We investigate the non-equilibrium topology of a periodically driven, dissipative Su-Schrieffer-Heeger chain using the ensemble geometric phase (EGP) $\phi_{\mathrm{EGP}}$-a generalisation of the Zak phase to open quantum systems. In contrast to ear

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Deterministic Realization of Classical Dissipation on Quantum Computers
arXiv Apr 29, 2026

arXiv:2604.25429v1 Announce Type: cross Abstract: Lattice Boltzmann (LB) on quantum devices must reconcile unitary gate evolution with the dissipative \emph{collision} step. In the multiple-relaxation-time (MRT) class, we work in the common setting of \emph{modewise diagonal} moment relaxation, $\d

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Polarization-preserving wavefront rotator
arXiv Apr 29, 2026

arXiv:2604.25475v1 Announce Type: cross Abstract: A K-mirror rotates the wavefront of an incident optical field. However, the rotation always introduces polarization changes in the transmitted field. This is a serious concern for applications ranging from astronomical image derotation to orbital an

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Quantum sensing-enabled deuterium NMR spectroscopy with nanoscale sensitivity at low magnetic fields
arXiv Apr 29, 2026

arXiv:2604.25752v1 Announce Type: cross Abstract: Nuclear magnetic resonance (NMR) spectroscopy provides unparalleled access to molecular structure and dynamics but is traditionally limited by weak signal strength, requiring large sample volumes and high magnetic fields. Here, we demonstrate nanosc

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A unified quantum random walk model for internal crystal effects in dynamical diffraction
arXiv Apr 29, 2026

arXiv:2604.25808v1 Announce Type: cross Abstract: The theory of dynamical diffraction (DD) in perfect crystals is the backbone of high-precision neutron and X-ray diffraction experiments, enabling accurate determination of crystal structure factors and the realization of perfect crystal interferome

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Optimized thermal control of a dual-wavelength-resonant nonlinear cavity
arXiv Apr 29, 2026

arXiv:2604.25883v1 Announce Type: cross Abstract: Optical resonator-enhanced nonlinear interactions are of great importance for the efficient generation of continuous-wave second harmonic generation, optical parametric oscillation, frequency mixing, and the generation of squeezed light. In order to

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Distributed Quantum Hypothesis Testing under Zero-rate Communication Constraints
arXiv Apr 29, 2026

arXiv:2410.08937v3 Announce Type: replace Abstract: The trade-offs between error probabilities in quantum hypothesis testing are by now well-understood in the centralized setting, but much less is known for distributed settings. Here, we study a distributed binary hypothesis testing problem to infe

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Quantum CORDIC -- Arcsine on a Budget
arXiv Apr 29, 2026

arXiv:2411.14434v2 Announce Type: replace Abstract: This work introduces a quantum algorithm for computing the function arcsine, with arbitrary accuracy. We leverage a technique from embedded computing and Field-Programmable Gate Arrays, called COordinate Rotation DIgital Computer (CORDIC). CORDIC

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Work Statistics via Real-Time Effective Field Theory: Application to Work Extraction from Thermal Bath with Qubit Coupling
arXiv Apr 29, 2026

arXiv:2502.18812v4 Announce Type: replace Abstract: Quantum thermal states are known to be passive, as required by the second law of thermodynamics. This paper investigates the potential for work extraction by coupling a thermal bath to a qubit of either spin, fermionic, or topological type, which

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End-to-End Speedup for Quantum Simulation-Based Optimization in Power Grid Management
arXiv Apr 29, 2026

arXiv:2505.16444v2 Announce Type: replace Abstract: Quantum Simulation-based Optimization (QuSO) is a recently proposed class of optimization problems that entails industrially relevant problems characterized by cost functions or constraints that depend on summary statistic information about the si

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Toward an Experimental Device-Independent Verification of Indefinite Causal Order
arXiv Apr 29, 2026

arXiv:2506.16949v4 Announce Type: replace Abstract: In classical physics, events follow a definite causal order: the past influences the future, but not the reverse. Quantum theory, however, permits superpositions of causal orders -- so-called indefinite causal orders -- which can provide operation

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Iterative Quantum Feature Maps
arXiv Apr 29, 2026

arXiv:2506.19461v4 Announce Type: replace Abstract: Quantum machine learning models that leverage quantum circuits as quantum feature maps (QFMs) are recognized for their enhanced expressive power in learning tasks. Such models have demonstrated rigorous end-to-end quantum speedups for specific fam

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Tunneling photons pose no challenge to Bohmian mechanics
arXiv Apr 29, 2026

arXiv:2507.20101v3 Announce Type: replace Abstract: Very recently, Sharoglazova et al. performed an experiment measuring the energy-velocity relationship and Bohmian velocity in coupled waveguides. Their data show a discrepancy between the semi-classical `speed' $v=\sqrt{2|\Delta|/m}$ and Bohmian v

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Measurement-Induced Entanglement in Conformal Field Theory
arXiv Apr 29, 2026

arXiv:2508.02788v3 Announce Type: replace Abstract: Local measurements can radically reshape patterns of many-body entanglement, especially in long-range entangled quantum-critical states. Yet, analytical results addressing the effects of measurements on many-body states remain scarce, and measurem

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Quantum Physics using Weighted Model Counting
arXiv Apr 29, 2026

arXiv:2508.21288v2 Announce Type: replace Abstract: Weighted model counting (WMC) has proven effective at a range of tasks within computer science, physics, and beyond. However, existing approaches for using WMC in quantum physics only target specific problem instances, lacking a general framework

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Quantum Tomography of Suspended Carbon Nanotubes
arXiv Apr 29, 2026

arXiv:2509.01858v4 Announce Type: replace Abstract: We propose and analyze an all-mechanical route to coherent control and quantum-state reconstruction of the fundamental flexural mode of a suspended carbon nanotube (CNT) operated in the anharmonic (Duffing/Kerr). A nearby atomic force microscope (

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Scaffold-assisted window junctions for superconducting qubit fabrication
Nature Apr 28, 2026

npj Quantum Information, Published online: 28 April 2026; doi:10.1038/s41534-026-01249-4Scaffold-assisted window junctions for superconducting qubit fabrication

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Efficient post-selection for general quantum LDPC Codes
Nature Apr 24, 2026

npj Quantum Information, Published online: 24 April 2026; doi:10.1038/s41534-026-01242-xEfficient post-selection for general quantum LDPC Codes

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Placing and routing quantum LDPC codes in multilayer superconducting hardware
Nature Apr 24, 2026

npj Quantum Information, Published online: 24 April 2026; doi:10.1038/s41534-026-01243-wPlacing and routing quantum LDPC codes in multilayer superconducting hardware

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Near-term fermionic simulation with subspace noise tailored quantum error mitigation
Nature Apr 24, 2026

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

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Surface-code hardware Hamiltonian
Nature Apr 22, 2026

npj Quantum Information, Published online: 22 April 2026; doi:10.1038/s41534-026-01241-ySurface-code hardware Hamiltonian

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Distributed quantum inner product estimation with structured random circuits
Nature Apr 21, 2026

npj Quantum Information, Published online: 21 April 2026; doi:10.1038/s41534-026-01247-6Distributed quantum inner product estimation with structured random circuits

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Two-qubit gates using on-demand single-photons from ordered shape and size controlled large-volume superradiant quantum dots
Nature Apr 21, 2026

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

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