Quantum Computing
Quantum Computing news — Monday 19 October 2026
113 stories from 3 sources, every one in English. Each links to its publisher.
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Chinese Startup FlipFlop Tuoyuan Emerges with Major VC Backing for 100-Logical-Qubit Neutral-Atom Systems
Quantum Computing Report
FlipFlop Tuoyuan, a Chinese quantum hardware startup, has secured over $14 million in early-stage funding to develop neutral-atom quantum processing units. Founded in July 2026 by Dr. Qiao Mu, the company aims to build a 100-logical-qubit…
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UK Government and UKRI Unveil £78M ($103.8M USD) Quantum Commercialization, Networking, and Skills Package
Quantum Computing Report
The UK government and UK Research and Innovation (UKRI) have announced a £78 million (approximately $103.8 million USD) funding package to advance quantum sensing, networking, and workforce development. This initiative, part of the…
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Podcast with Joel Van Dyk, CTO/CISO and Co-Founder of Done. Quantum Security Limited
Quantum Computing Report
Podcast with Joel Van Dyk, a physicist turned Wall Street cybersecurity veteran, about the quantum threat to cryptography and what organizations should be doing right now to prepare. The post Podcast with Joel Van Dyk, CTO/CISO and…
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NVIDIA and Jülich Run 104-Qubit Magic State Cultivation Simulation on JUPITER Supercomputer
Quantum Computing Report
NVIDIA and Jülich Supercomputing Centre simulated a 104-qubit fault-tolerant quantum computing experiment on the JUPITER supercomputer, Europe's first exascale system. This simulation, detailed in an NVIDIA technical report, validated a…
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Xanadu Secures Up to $10 Million in Additional DARPA Funding Under QBI Program
Quantum Computing Report
Xanadu, a photonic quantum computing company, has secured up to $10 million in additional DARPA funding through the Quantum Benchmarking Initiative (QBI). This one-year contract extension will support Xanadu's hardware and software…
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NVIDIA Runs Simulation of Fault-Tolerant Quantum Computing at Jülich Supercomputing Centre
The Quantum Insider
Insider Brief NVIDIA simulated a 104-qubit fault-tolerant quantum processor on Europe’s JUPITER supercomputer to evaluate magic-state cultivation under realistic hardware noise. The approach studied could reduce the qubits needed to…
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Quantinuum Demonstrates 99.9995% Logical Memory Fidelity on Helios Trapped-Ion Processor
Quantum Computing Report
Quantinuum has demonstrated a 99.9995% logical memory fidelity on its Helios trapped-ion quantum computer, achieving a logical error rate of 5 × 10-6 per syndrome-extraction round on a distance-7 code. This performance shows exponential…
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Quantinuum Reports a 10x Reduction in Logical Error Rate on Helios
The Quantum Insider
Insider Brief Quantinuum reported 99.9995% logical fidelity on its Helios quantum computer using a color code, equivalent to five errors per million operations and a tenfold reduction from its previous result. Logical errors decreased…
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China’s Tuoyuan Targets Neutral-Atom Quantum Computing
The Quantum Insider
Insider Brief Chinese startup Tuoyuan, led by quantum researcher Mu Qiao, is pursuing neutral-atom quantum computing with a reported development target of 100 logical qubits. QbitAI reported that the company raised hundreds of millions of…
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Advance Could Lead to Bigger, More Reliable Quantum Computers, University of Edinburgh Scientists Say
The Quantum Insider
Insider Brief Researchers developed an algorithm that allows standard computers to simulate photonic quantum devices using about 5% of the computing power previously required, according to the team. In tests involving Gaussian boson…
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RIKEN Team Improves Parallel Control of Silicon Spin Qubits
The Quantum Insider
Insider Brief RIKEN researchers demonstrated high-accuracy parallel control of silicon spin qubits using a shared microwave line and a calibration method that reduces control errors. Pairwise phase calibrations helped maintain gate…
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UKRI Backs UK Quantum Businesses With Share of £50 Million
The Quantum Insider
Insider Brief UK Research and Innovation (UKRI) has announced £50 million for UK quantum technology projects, alongside separate funding for quantum networking infrastructure and workforce training. The funded projects include MoniRail ‘s…
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Metric and Dispersive Dynamics of Phase Perturbations in Bohmian Quantum Mechanics
arXiv quant-ph
arXiv:2610.22737v1 Announce Type: new Abstract: By linearizing the hydrodynamic equations associated with the Madelung transformation in the context of Bohmian dynamics, we derive an effective metric for the phase perturbation around a…
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Multi-Time States in Quantum and Operational Probabilistic Theories: An Axiomatic Framework
arXiv quant-ph
arXiv:2610.22489v1 Announce Type: new Abstract: Quantum states over time were introduced, in part, to extend Bayesian probability to quantum theory and have since found applications across diverse areas, ranging from quantum causality and…
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Trapping of nanofabricated SiO$_2$ high-aspect-ratio discs in an optical lattice
arXiv quant-ph
arXiv:2610.22614v1 Announce Type: cross Abstract: We describe the nanofabrication and loading of lithographically patterned, high aspect ratio $10$ $\mu$m diameter silicon dioxide discs with thickness of $400$ nm into an optical standing…
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Scaling of entanglement with distance between subsystems: detection of phase transitions in the $t'$-$\pi$-flux model
arXiv quant-ph
arXiv:2610.23770v1 Announce Type: cross Abstract: The system-size scaling of bipartite entanglement can be used to detect phase transitions. We develop a related approach for strongly correlated electron models where large density matrices…
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Diagrammatic Reasoning with Control as a Constructor, Applications to Quantum Circuits
arXiv quant-ph
arXiv:2508.21756v4 Announce Type: replace Abstract: Control is a fundamental concept in quantum and reversible computational models. It enables the conditional application of a transformation to a system, depending on the state of another…
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The three kinds of three-qubit entanglement
arXiv quant-ph
arXiv:2511.07617v3 Announce Type: replace Abstract: We construct an important missing piece in the entanglement theory of pure three-qubit states, which is a polynomial measure of W-entanglement. This works in parallel to the three-tangle…
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Quantumness of Entanglement in Schwarzschild de Sitter Spacetime
arXiv quant-ph
arXiv:2610.22761v1 Announce Type: new Abstract: We investigate genuine multipartite entanglement and genuine tripartite nonlocality of a noisy generalized GHZ state in Schwarzschild-de Sitter spacetime. The genuine multipartite concurrence…
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Certifying information flow in multi-agent behaviours
arXiv quant-ph
arXiv:2610.23631v1 Announce Type: new Abstract: We study which input-output behaviours of several agents can be produced by a declared communication schedule, that is, a fixed sequence of senders, recipients, message alphabets, and output…
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Analytic formulae for non-local nonstabiliserness in bipartite systems of qutrits and ququints
arXiv quant-ph
arXiv:2603.09155v2 Announce Type: replace Abstract: We conjecture analytic expressions for the non-local magic of bipartite pure qudit states of prime local dimension. Our construction relies on the Schmidt-aligned state attaining the…
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Quantum instanton theory for metastable collective spin systems
arXiv quant-ph
arXiv:2604.15091v2 Announce Type: replace Abstract: Collective spin systems -- driven-dissipative spin ensembles whose unitary and dissipative processes act uniformly on all spins, allowing their dynamics to be described as a single…
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Resonance crossings and diabolical points for DC electric field quantum sensors
arXiv quant-ph
arXiv:2610.23392v1 Announce Type: new Abstract: Since the 1990s, experiments on double-well heterostructures have highlighted a key phenomenon: applying an external DC electric field induces pronounced wave packet oscillations at specific…
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Quantum Circuits for Variable-Coefficient Vlasov Dynamics via Schr\"odingerisation
arXiv quant-ph
arXiv:2610.23405v1 Announce Type: new Abstract: High-dimensional Vlasov equations present promising use cases for quantum simulation, but their transport coefficients must be implemented coherently in order to preserve a compact quantum…
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Electrostatic Limits on Quantum Spatial Search
arXiv quant-ph
arXiv:2610.23560v1 Announce Type: new Abstract: We prove that a quantum walker cannot search a two-dimensional lattice in Grover's $O(\sqrt N)$ time, resolving the long-standing open question posed by Aaronson and Ambainis in 2003. A…
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Circuit-based characterization of finite-temperature quantum phases and self-correcting quantum memory
arXiv quant-ph
arXiv:2509.15204v3 Announce Type: replace Abstract: Quantum phases at zero temperature can be characterized as equivalence classes under local unitary transformations: two ground states within a gapped phase can be transformed into each…
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ConQUESTA: Topology-Aware Post-Training Structural Pruning of Quantum Neural Networks
arXiv quant-ph
arXiv:2610.23415v1 Announce Type: new Abstract: Deploying quantum neural networks (QNNs) on sparse hardware requires preserving task accuracy while reducing compiler-induced two-qubit gates, SWAPs, and depth. We present ConQUESTA…
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Leveraging verifiable structure in quantum circuits to find more efficient compilations with agentic AI
arXiv quant-ph
arXiv:2610.23832v1 Announce Type: new Abstract: We discuss an effective paradigm of utilizing AI agents to better compile quantum circuits when one can constrain bottleneck subroutines to have some form of classically verifiable structure…
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Floquet-ADAPT-VQE: A Quantum Algorithm to Simulate Non-Equilibrium Physics in Periodically Driven Systems
arXiv quant-ph
arXiv:2503.11613v3 Announce Type: replace Abstract: Periodically driven quantum systems exhibit many fascinating phenomena absent in equilibrium systems, but their simulation is more challenging than that of static systems. Consequently…
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Perspective: Quantum Computing on Magnetic Racetrack
arXiv quant-ph
arXiv:2604.19304v2 Announce Type: replace-cross Abstract: Magnetic domain walls have long been pursued as carriers of classical information for storage and processing. With the ability to create, control, and probe domain walls at the…
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Exponential-SWAP gate between bosonic motional modes of trapped ions
arXiv quant-ph
arXiv:2610.23208v1 Announce Type: new Abstract: The exponential-SWAP (eSWAP) gate generates a coherent superposition of identity and SWAP operations, with continuously tunable amplitudes. We experimentally implement this gate between two…
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From Atomistic Impurity Landscapes to Two-Level-System Distributions and Microwave Loss: Hydrogen-Induced Losses in Nb$_2$O$_{5-\delta}$ and Ta$_2$O$_{5-\delta}$
arXiv quant-ph
arXiv:2603.17194v2 Announce Type: replace-cross Abstract: We introduce a first-principles-guided framework for predicting statistical TLS distributions from mobile impurities in disordered materials. Machine-learned interatomic potentials…
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Anticommuting Displacement Operators, Exact Pauli Algebras,and the Singlet State from the Oscillator Vacuum
arXiv quant-ph
arXiv:2610.23264v1 Announce Type: new Abstract: We give an explicit construction of a pair of anticommuting Weyl displacement operators for a harmonic oscillator and use bounded functional calculus to obtain exact dichotomic…
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A Fibre-Integrated SPDC Heralded Single-Photon Source Using Zn-Indiffused PPLN Ridge Waveguides at Telecom Wavelengths
arXiv quant-ph
arXiv:2610.23499v1 Announce Type: new Abstract: We demonstrate a fully fibre-integrated source of broadband polarisation-entangled photon pairs at telecom wavelengths based on a commercially available Zn-indiffused MgO:PPLN ridge waveguide…
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Semiclassical Analysis of Wave Dynamics via Wigner Transforms: Applications to the Quantum Harmonic, Anharmonic, and Dirac Oscillator
arXiv quant-ph
arXiv:2610.22414v1 Announce Type: cross Abstract: In this Master's thesis, we give a pedagogical introduction to the semiclassical analysis of wave dynamics in single-band and multi-band systems. We show how the semiclassical evolutions of…
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Area Theorems for Quantum Error Correction
arXiv quant-ph
arXiv:2610.22710v1 Announce Type: cross Abstract: The extrinsic information transfer (EXIT) and generalized EXIT (GEXIT) area theorems provide fundamental conservation laws that connect the rate of classical codes to the performance of…
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Controlled PROP: Theory and Applications to Quantum Circuits
arXiv quant-ph
arXiv:2610.23192v1 Announce Type: new Abstract: Control is a fundamental concept in quantum and reversible computational models. It enables the conditional application of a transformation to a system, depending on the state of another…
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Quantum Sensitivity of $N$-Component Cat States
arXiv quant-ph
arXiv:2610.23398v1 Announce Type: new Abstract: We extend our previous study of squeezed two-component Schr\"odinger cat states to a phase-referenced single-mode family with an arbitrary number $N$ of coherent components and general…
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Exponential clustering of bipartite quantum entanglement at arbitrary temperatures
arXiv quant-ph
arXiv:2108.12209v5 Announce Type: replace Abstract: Macroscopic quantum effects play central roles in the appearance of inexplicable phenomena in low-temperature quantum many-body physics. Such macroscopic quantumness is often evaluated…
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A thermally and perturbatively stable classical spin model in two dimensions
arXiv quant-ph
arXiv:2610.22548v1 Announce Type: new Abstract: We show that the 2D classical spin model constructed in arXiv:2605.10943 hosts many metastable states at non-zero temperature which are stable to arbitrary Hamiltonian perturbations…
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Circuit Synthesis for Variational Quantum Algorithms: The Depth of Algebra and Geometry
arXiv quant-ph
arXiv:2610.22689v1 Announce Type: new Abstract: The analysis of Hamiltonian Variational Ans\"atze centers on three fundamental questions: which states are exactly reachable from a given initial state, what native control depth suffices for…
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Quantum-Assisted Unambiguous Discrimination of Pure States with Robustness Bounds
arXiv quant-ph
arXiv:2610.22954v1 Announce Type: new Abstract: We propose a hybrid quantum-classical framework for the unambiguous discrimination of pure states by combining the noisy intermediate-scale quantum semidefinite program solver (NSS) with the…
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Delta-sigma noise shaping for low-resolution quantization in Gaussian-modulated continuous-variable quantum key distribution
arXiv quant-ph
arXiv:2610.23654v1 Announce Type: new Abstract: Low-resolution digital-to-analog conversion can simplify continuous-variable quantum key distribution (CVQKD) transmitters, but coarse quantization increases excess noise and can generate…
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Partially isophase electro-magnetic configurations
arXiv quant-ph
arXiv:2610.23645v1 Announce Type: new Abstract: Separation of variables in Schr\"{o}dinger equation allows an infinite-dimensional family of physically distinct field configurations that are dynamically indistinguishable in one selected…
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Dilaton-Axion Wormhole Partition Function Away from the BPS Endpoint
arXiv quant-ph
arXiv:2610.22429v1 Announce Type: cross Abstract: I determine the leading finite-radius correction to the two-boundary response of a charged axion wormhole near its BPS endpoint. With $\delta=a_*^2$, exact radial matching in a product…
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Chirality-resolved imaging of spin waves with a quantum spin
arXiv quant-ph
arXiv:2610.22867v1 Announce Type: cross Abstract: Spin waves carry their propagation direction in the handedness of their circularly polarized stray field, a property inaccessible to scalar magnetometers. In the Damon-Eshbach surface wave…
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Unconditional Quantum PAC Learning Advantage in the Large Error Regime
arXiv quant-ph
arXiv:2610.23268v1 Announce Type: cross Abstract: We establish an unconditional super-polynomial separation between quantum and classical PAC learning of Boolean functions under the uniform distribution in the large error regime. For every…
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Logarithmic-depth quantum state preparation of polynomials
arXiv quant-ph
arXiv:2603.16527v4 Announce Type: replace Abstract: Quantum state preparation is a central primitive in many quantum algorithms, yet it is generally resource intensive, with efficient constructions known only for structured families of…
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Rate and depth of two-axis twisting by pair exchange under the self-Kerr constraint
arXiv quant-ph
arXiv:2610.15774v2 Announce Type: replace Abstract: In this paper, we study two bosonic modes that exchange pairs of quanta, which realize two-axis twisting exactly: within a sector of fixed particle number the exchange operator is…
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Level statistics of the disordered Haldane-Shastry model with $1/r^\alpha$ interaction
arXiv quant-ph
arXiv:2604.14695v2 Announce Type: replace-cross Abstract: Understanding how the interaction range and various types of disorder affect the level statistics of many-body quantum systems, leading to the emergence of many-body localization…
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Exact Gaussian--Hermite closure of the mapping quantum--classical Liouville equation
arXiv quant-ph
arXiv:2610.16864v2 Announce Type: replace-cross Abstract: In the Meyer--Miller--Stock--Thoss mapping representation, the Liouville operator of the quantum--classical Liouville equation contains an excess coupling term in addition to the…
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Programmable Preparation of Topological Entangled States
arXiv quant-ph
arXiv:2610.22738v1 Announce Type: new Abstract: Programmable preparation of entangled quantum states is a central requirement for scalable quantum information processing, quantum networking and photonic quantum computing. Topological…
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Bottlenecks in quantum channels and finite temperature phases of matter
arXiv quant-ph
arXiv:2412.09598v2 Announce Type: replace Abstract: We prove an analog of the "bottleneck theorem," well-known for classical Markov chains, for Markovian quantum channels. In particular, we show that if two regions (subspaces) of Hilbert…
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Geometric inflation of deviations challenges neural quantum states in dynamics of quantum Ising models
arXiv quant-ph
arXiv:2609.07645v2 Announce Type: replace Abstract: Neural quantum states (NQS) have emerged as a powerful framework for simulating non-equilibrium dynamics in strongly correlated quantum systems, offering scalable variational…
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Typical Superpositions are Magical
arXiv quant-ph
arXiv:2610.22476v1 Announce Type: new Abstract: The non-stabilizerness, or "magic", of a quantum state is a common metric for the hardness of simulation on a classical computer, and is often quantified by the stabilizer R\'enyi entropy…
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Exploring Quantum Phase Transitions Beyond Landau Theory on a Quantum Processor
arXiv quant-ph
arXiv:2610.22482v1 Announce Type: new Abstract: Direct continuous quantum phase transitions between phases that break distinct symmetries challenge the conventional Landau-Ginzburg-Wilson paradigm and provide a framework for deconfined…
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From quantum emitters to technological platforms: a perspective on semiconductor quantum dots
arXiv quant-ph
arXiv:2610.23106v1 Announce Type: cross Abstract: Photonic quantum technologies are based on controlled photon states. To generate these, quantum dots have emerged as excellent sources of single and entangled photons. In this Perspective…
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SpinControl: Control Software for Prototyping and Benchmarking of Spin-Qubit Devices and Measurement Protocols
arXiv quant-ph
arXiv:2610.23316v1 Announce Type: new Abstract: Quantum computers require software to control the states of the qubits. As the actions on qubits grow in complexity with circuit execution, calibration, and benchmarking, the complexity of…
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Expressivity of IQP Feature-Map Quantum Kernels via Reproducing Kernel Hilbert Spaces
arXiv quant-ph
arXiv:2610.23692v1 Announce Type: new Abstract: Quantum kernels are among the most promising methods in quantum machine learning, providing a natural way to embed data into high-dimensional Hilbert spaces via quantum circuits and capturing…
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Time-dependent integrable quantum field theories with dynamical boundaries
arXiv quant-ph
arXiv:2610.03870v2 Announce Type: replace-cross Abstract: We present a general method to construct and solve time-dependent integrable chiral quantum field theories on finite intervals from autonomous scattering and reflection data…
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Task-aligned spectral inductive biases in parameterized quantum circuits
arXiv quant-ph
arXiv:2610.23834v1 Announce Type: new Abstract: Parameterized quantum circuits are widely investigated in quantum machine learning, yet how their architecture can provide task-aligned inductive biases remains poorly understood. We study…
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Impact of Irrep Truncations on Quantum Simulations of QCD
arXiv quant-ph
arXiv:2610.23681v1 Announce Type: cross Abstract: Quantum simulations of lattice gauge theories with continuous gauge groups require a choice of basis (how states of the gauge theory map to the qubit computational basis) and truncation…
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Non-Monotonic Exciton Transport Efficiency in Multi-layer Ring-shaped Quantum Networks inspired by Photosystem I
arXiv quant-ph
arXiv:2610.13949v2 Announce Type: replace-cross Abstract: Photosystem I (PSI) is one of the most efficient natural photosynthetic complexes and serves as a structural prototype for understanding excitation energy transfer (EET) and…
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Quantum-Classical Neural Networks for Solving Lindblad Master Equations
arXiv quant-ph
arXiv:2610.22691v1 Announce Type: new Abstract: Variational quantum algorithms have emerged as a promising approach for simulating open quantum systems, yet their expressive power and trainability remain poorly understood. We propose a…
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Concrete Functions in Private Simultaneous Quantum Messages: Quantum Advantages and Structural Limitations
arXiv quant-ph
arXiv:2610.23090v1 Announce Type: new Abstract: Private simultaneous quantum messages (PSQM) provide a minimal model of noninteractive secure multiparty quantum computation, yet their communication complexity for concrete functions remains…
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Inverse Current in Coupled Transport: A Quantum Thermodynamic Model
arXiv quant-ph
arXiv:2405.01295v4 Announce Type: replace Abstract: The recent discovery of inverse current in coupled transport (ICC) in classical systems [Wang et al., Phys. Rev. Lett. 124, 110607 (2020)] -- where an induced current flows opposite to…
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Probability distribution analysis of the cascaded variational quantum eigensolver
arXiv quant-ph
arXiv:2605.00807v2 Announce Type: replace Abstract: The cascaded variational quantum eigensolver (CVQE) circumvents the need for iterative communication between the quantum and classical processing units that is necessary in the…
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Predicting Dynamics from Flows of the Eigenstate Thermalization Hypothesis
arXiv quant-ph
arXiv:2504.01073v3 Announce Type: replace Abstract: Analytical treatments of far-from-equilibrium quantum dynamics are few, even in well-thermalizing systems. The celebrated eigenstate thermalization hypothesis (ETH) provides a post hoc…
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A finite-shot mean-squared-error boundary for Richardson zero-noise extrapolation
arXiv quant-ph
arXiv:2605.08251v2 Announce Type: replace Abstract: Zero-noise extrapolation (ZNE) reduces the bias of noisy quantum-circuit measurements, but Richardson coefficients and shot splitting increase their statistical error. This paper…
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Photon-stimulated decay of $\chi$-matched ancillas causes unheralded bit flips in bosonic codes
arXiv quant-ph
arXiv:2610.17017v2 Announce Type: replace Abstract: Bosonic codes often read out their syndrome with a transmon ancilla whose computational levels $g$ and $f$ have equal parity and matched dispersive shifts: a decay $f\to e$ is then…
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Recursive Operator Localization and Spectral Gap Descent via the Geometry of Local Spectral Expansion
arXiv quant-ph
arXiv:2610.23695v1 Announce Type: new Abstract: We introduce Recursive Operator Localization (ROL), a framework for constructing hierarchies of local energy problems linked by linear maps between Hilbert spaces. To address spectral-gap…
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Cayley access models for matrix functions: reachable class and cost
arXiv quant-ph
arXiv:2610.23429v1 Announce Type: new Abstract: We study how to compute $f(A)b$ on a quantum computer, where $A$ is Hermitian. When $f$ is nonsmooth or has localized difficulty in the spectrum, classical numerical linear algebra…
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Sample-Based Quantum Linear Solver and Bounds on Krylov-State Sampling
arXiv quant-ph
arXiv:2610.23138v1 Announce Type: new Abstract: To solve linear systems $Ax=b$, we propose a sample-based quantum linear solver combining quantum Krylov-state sampling with classical variational diagonalization. Rather than simulating the…
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The Classical Boundary of Quantum Computation: History-Resolved Causal Stochastic Machines and the Cost of Classicalization
arXiv quant-ph
arXiv:2610.22750v1 Announce Type: new Abstract: What separates quantum computation from classical computation when a classical model may retain every branch history and arbitrary causal memory? We study this question using history-resolved…
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On the relationship between the POVM framework and the no-signaling hypothesis
arXiv quant-ph
arXiv:2610.22823v1 Announce Type: new Abstract: The quantum foundations literature contains dozens of "no-signaling" arguments that rely on the Born rule or, more generally, the positive operator-valued measure (POVM) framework to show…
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Improving the estimation of spin-bath parameters via initial correlations and a two-qubit probe
arXiv quant-ph
arXiv:2610.23582v1 Announce Type: new Abstract: We study how a second qubit can improve the estimation of spin-environment parameters when only one of the two qubits is measured. Both qubits are coupled to a common spin bath through the…
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Universal Threshold Laws for Dipolar Evaporation of Molecular Fermi Gases
arXiv quant-ph
arXiv:2610.22639v1 Announce Type: cross Abstract: Fermi statistics suppress the elastic collisions that rethermalize a Fermi gas during evaporative cooling, creating a fundamental low-temperature bottleneck for producing quantum degenerate…
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Temperature dependence of a warm ensemble based memory on quantum communication rates
arXiv quant-ph
arXiv:2610.23536v1 Announce Type: new Abstract: The success of long-distance quantum communication will hinge on quantum repeater nodes equipped with robust and scalable quantum memories. Such memories must possess specific operating…
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Temperature dependence of the Casimir force between plane-layered structures: an approach based on the principle of argument
arXiv quant-ph
arXiv:2610.23354v1 Announce Type: new Abstract: Based on the complex analysis theorem the principle of argument, a temperature-dependent formula for the Casimir-Lifshitz dispersion force of the interaction of two arbitrary plane-layered…
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Multiscale Quantum-Classical Simulation of Protein Autoproteolysis in a Million-Atom Membrane Environment
arXiv quant-ph
arXiv:2610.23108v1 Announce Type: cross Abstract: Predicting chemical reactions in biomolecules is challenging because reactive centers are embedded within complex environments that strongly influence their energetics and mechanisms. Here…
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Solving Large-Scale Parameter Inference in Controllable Nuclear Fusion via Coherent Ising Machines and Block Coordinate Descent
arXiv quant-ph
arXiv:2610.23507v1 Announce Type: new Abstract: Bayesian inference enables self-consistent plasma parameter inversion in tokamak integrated data analysis by fusing multi-source diagnostics. However, under nonlinear Gaussian likelihoods…
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Quantum approximate stochastic combinatorial optimisation
arXiv quant-ph
arXiv:2610.22876v1 Announce Type: new Abstract: Two-stage stochastic combinatorial optimisation concerns discrete decisions made before all relevant information is known. An initial decision is made; once uncertainty is resolved, it can be…
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Demonstration of Logical Error Suppression in a Surface Code Memory on a Cloud-Accessible IBM Superconducting Processor
arXiv quant-ph
arXiv:2610.23840v1 Announce Type: new Abstract: Quantum error correction can suppress logical errors exponentially with code distance when physical noise is below threshold. Realizing this on hardware requires tight coordination among…
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Continuous variable dense coding under realistic non-ideal scenarios
arXiv quant-ph
arXiv:2407.07609v2 Announce Type: replace Abstract: We analyze the continuous variable (CV) dense coding protocol between a single sender and a single receiver when affected by noise in the shared and encoded states, as well as when the…
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Transport and thermalization under noncommuting localized constraints
arXiv quant-ph
arXiv:2610.23781v1 Announce Type: cross Abstract: We investigate the effects of spatially localized conserved quantities on transport and thermalization in quantum and classical many-body systems. We consider several related models: the…
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Characterization of Linear Measurements in Cavity Optomechanics: Examples and Applications
arXiv quant-ph
arXiv:2508.21419v2 Announce Type: replace Abstract: Detailed understanding of physical measurements is essential for devising efficient metrological strategies and measurement-feedback schemes, as well as finding fundamental limitations on…
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Higher-Dimensional Information Lattice: Quantum State Characterization through Inclusion-Exclusion Local Information
arXiv quant-ph
arXiv:2512.20793v2 Announce Type: replace Abstract: Developing a local description of quantum information is a central problem in quantum many-body physics: the goal is to identify how correlations are organized across positions and scales…
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Resonant pair production and flat band melting in a driven Rydberg chain
arXiv quant-ph
arXiv:2610.22532v1 Announce Type: new Abstract: We study a Rydberg chain subjected to a two-tone periodic drive of the detuning $\Delta(t)$ and Rabi frequency $\Omega(t)$ at frequencies $\omega_1$ and $\omega_2=\nu \omega_1$ respectively…
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Bell scenarios encode classical non-causality
arXiv quant-ph
arXiv:2610.23367v1 Announce Type: new Abstract: Bell and contextuality scenarios are unified within the Ac\'in-Fritz-Leverrier-Sainz hypergraph formalism, in which measurements are hyperedges. Multipartite measurements are obtained from…
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Quality-of-Transmission Estimation in Quantum Networks: Compute, Simulate, or Learn?
arXiv quant-ph
arXiv:2610.23827v1 Announce Type: new Abstract: Future quantum networks will rely on control-plane decisions such as routing, scheduling, entanglement provisioning, purification, and memory allocation. Each decision depends on a timely and…
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Holographic two-point functions across a PT symmetry-breaking transition
arXiv quant-ph
arXiv:2610.23580v1 Announce Type: cross Abstract: In parity-time (PT)-symmetric non-Hermitian systems, an exceptional point, where eigenvalues and eigenvectors coalesce, typically separates a real spectrum from complex-conjugate…
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Anyonic Neural Network Wavefunctions
arXiv quant-ph
arXiv:2610.23815v1 Announce Type: cross Abstract: The macroscopic behavior of a non-interacting gas of Abelian anyons has remained unsettled for many decades. Prior numerical methods employing exact diagonalization in the continuum and on…
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Entropy Production and Thermalization in Heavy-Quark Langevin Dynamics
arXiv quant-ph
arXiv:2610.22501v1 Announce Type: cross Abstract: Heavy quarks are often treated as Brownian probes of the quark-gluon plasma. We formulate the irreversible entropy balance of their momentum distribution and separate the production…
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Failure of the mean-field Hartree approximation for a bosonic many-body system with non-Hermitian Hamiltonian
arXiv quant-ph
arXiv:2601.13038v3 Announce Type: replace Abstract: Mean-field Hartree theory is a central tool for reducing many-body dynamics to an effective one-particle evolution. This approximation has been employed when the Hamiltonian governing the…
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Experimental Demonstration of a Balanced Travelling Wave Parametric Amplifier
arXiv quant-ph
arXiv:2610.23810v1 Announce Type: cross Abstract: Superconducting travelling-wave parametric amplifiers (TWPAs) provide broadband gain, low added noise, and high dynamic range, making them attractive for applications requiring wide…
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MIP*=RE
arXiv quant-ph
arXiv:2001.04383v4 Announce Type: replace Abstract: We show that the class MIP* of languages that can be decided by a classical verifier interacting with multiple all-powerful quantum provers sharing entanglement is equal to the class RE…
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Nonergodicity from Hilbert-Subspace Cloning
arXiv quant-ph
arXiv:2610.23105v1 Announce Type: cross Abstract: We identify a class of nonintegrable quantum many-body systems composed of single Pauli strings that possess an extensive number of noncommuting local conserved quantities and exhibit…
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Optimal single-copy estimation of quantum state moments: why $\operatorname{Tr}(\rho^3)$ and $\operatorname{Tr}(\rho^4)$ are equally hard
arXiv quant-ph
arXiv:2609.37781v2 Announce Type: replace Abstract: Estimating nonlinear properties of an unknown quantum state with restrictive experimental accessibility is a fundamental problem in quantum learning. We study the sample complexity of…
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Discrete time crystals and classical logic gates in coupled open Dicke models
arXiv quant-ph
arXiv:2610.23043v1 Announce Type: new Abstract: We investigate the dynamics of coupled discrete time crystals (DTCs) in the coupled Dicke model or Dicke dimer (DD) with dissipation. By numerically simulating the mean-field dynamics of the…
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QMBL: the Quantum Many-Body Leaderboard. A live record of published ground-state energies for lattice Hamiltonians
arXiv quant-ph
arXiv:2610.22387v1 Announce Type: cross Abstract: In condensed matter physics, scientists explore phase diagrams of matter through various methods (analysis, numerics, experiment) and achieve consensus when enough methods agree. The…
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Development of a fabrication-to-benchtop process for SiN-based quantum devices
arXiv quant-ph
arXiv:2610.22776v1 Announce Type: cross Abstract: Silicon nitride has emerged as a key material for the advancement of future quantum communication and computational devices. However, challenges persist in establishing a comprehensive…
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Nonequilibrium Dynamical Quantum Phase Transitions in the Extended Agassi Model
arXiv quant-ph
arXiv:2610.23096v1 Announce Type: new Abstract: We investigate dynamical quantum phase transitions (DQPTs) in the extended Agassi model following sudden quenches of same level pairing ($\Sigma$), monopole-monopole ($\chi$) and cross level…
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Transverse momentum as the counter-diabatic generator in bent waveguide couplers
arXiv quant-ph
arXiv:2609.36431v2 Announce Type: replace Abstract: Bending the axis of a mode-evolution coupler suppresses the nonadiabatic coupling between its supermodes, and bent couplers of this kind were recently shown to realize the…
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Non-invasive 2D spatial measurements of electric fields within a plasma sheath
arXiv quant-ph
arXiv:2511.12322v2 Announce Type: replace-cross Abstract: We introduce an all-optical quantum-enhanced diagnostic for electric fields in low-temperature plasmas. Trace amounts of rubidium vapor, added to an argon plasma, allow us to employ…
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Quantum Tsallis Entropy Estimation: Near-Optimal Bounds and High-Precision Improvements
arXiv quant-ph
arXiv:2610.22983v1 Announce Type: new Abstract: Estimating statistical properties of probability distributions is a fundamental problem in statistics and theoretical computer science. We develop quantum algorithms for estimating the…
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Action-Quantized Scar Multiplets and Dissipative Cat States from Fractal Period-Locking in the Open Quantum Baker Map
arXiv quant-ph
arXiv:2610.23573v1 Announce Type: cross Abstract: We open the quantum baker map with a position window of width $w$ and center $q_c$. Classical pruning tiles the $(q_c,w)$ plane into diamonds where the $T$ leading resonances form…
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Hybrid boson sampling-neural network architecture for enhanced classification
arXiv quant-ph
arXiv:2510.13332v2 Announce Type: replace Abstract: Demonstration of quantum advantage for classical machine learning tasks remains a central goal for quantum technologies and artificial intelligence. Two major bottlenecks to this goal are…
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Risk-aware neural pulse compilation of continuously parameterized single-qubit gates with optimal-control benchmarking and NMR hardware validation
arXiv quant-ph
arXiv:2604.11314v3 Announce Type: replace Abstract: Pulse-level compilation can reduce the depth and calibration overhead associated with decomposing continuously parameterized quantum operations into fixed gate libraries, but conventional…
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Separability from Multipartite Measures
arXiv quant-ph
arXiv:2605.02097v3 Announce Type: replace Abstract: We show that multi-invariants provide necessary and sufficient criteria for full separability in finite-dimensional multipartite systems. For tripartite three-qubit states, the…
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Caustics and catastrophes in strong-field physics $-$ Picard-Lefschetz theory as a universal approach to saddle-point methods in attosecond science
arXiv quant-ph
arXiv:2605.03794v2 Announce Type: replace Abstract: Ultrashort laser pulses on the attosecond timescale are typically achieved via high-order harmonic generation (HHG), a nonlinear process in which atoms interact with intense light fields…
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Liouvillian Non-Invertible Symmetry
arXiv quant-ph
arXiv:2610.23111v1 Announce Type: new Abstract: Non-invertible symmetries extend conventional symmetries beyond group-like transformations and play an important role in quantum field theory and many-body physics. However, a general…
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Dominant Eigenstate Isolation through Symmetry-Orbit Decoupling
arXiv quant-ph
arXiv:2606.21962v2 Announce Type: replace Abstract: We address the problem of extracting a target eigenstate from an approximate pure state. Our approach, symmetry-orbit decoupling, exploits symmetries that preserve the target state while…
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Learning angles for quantum approximate optimization
arXiv quant-ph
arXiv:2610.23296v1 Announce Type: new Abstract: The Quantum Approximate Optimization Algorithm (QAOA) and its variants are leading algorithms to help solve challenging combinatorial optimization problems. QAOA maps these problems to Ising…