Quantum Computing
Quantum Computing news — Wednesday 21 October 2026
150 stories from 3 sources, every one in English. Each links to its publisher.
-
Plurilock Sets Vote on Quantum eMotion Acquisition
The Quantum Insider
Insider Brief Plurilock shareholders will vote Nov. 18 on a proposed acquisition by Quantum eMotion that would combine quantum-based security technologies with Plurilock’s cybersecurity operations and customer network. Shareholders would…
-
GOTT Funds NPL Project to Scale Trapped-Ion Quantum Technology
The Quantum Insider
Insider Brief The National Physical Laboratory (NPL) has secured Government Office for Technology Transfer (GOTT) funding to advance trapped-ion quantum computing technology , with a focus on manufacturing scalability. The project will…
-
Before the Qubit
The Quantum Insider
How hybrid infrastructure is making quantum commercially actionable today – and why the organizations building that infrastructure now will be the ones ready when the hardware arrives. Insider Brief Quantum readiness is an infrastructure…
-
Plurilock Files Information Circular and Schedules Shareholder Vote for C$33.8M ($24M USD) Acquisition by Quantum eMotion
Quantum Computing Report
Plurilock Security Inc. will hold a shareholder meeting on November 18, 2026, to vote on its acquisition by Quantum eMotion Corp. for C$33.8 million (~$24 million USD). Plurilock shareholders will receive C$0.084 in cash and 0.0763 of a…
-
qBraid Announces qBraid OS For Operating Quantum Computing Services
The Quantum Insider
Insider Brief qBraid introduced qBraid OS to help quantum hardware providers and system operators manage their computers and offer access for commercial or internal use. The software manages user access, scheduling, usage tracking and…
-
Coherence Quantum Launches with €2.78 Million ($3.1 Million USD) Seed Round to Scale Cryogenic Quantum Control
Quantum Computing Report
Coherence Quantum has launched with €2.78 million in seed funding to develop cryogenic quantum control infrastructure for solid-state quantum processors. The company aims to overcome thermal, wiring, and density bottlenecks in large-scale…
-
South Korea Expands Quantum Communications Testbeds Through 2028
The Quantum Insider
Insider Brief South Korea plans to expand its quantum communications testing infrastructure through three hubs focused on commercial applications, overseas interoperability and next-generation technologies through 2028. The Ministry of…
-
Black Kite Introduces Quantum Readiness Controls to Assess Third-Party Cryptographic Risk
Quantum Computing Report
Black Kite has launched Quantum Readiness, a new feature in its Cyber Rating engine that assesses third-party vendors' preparedness for post-quantum cryptography. This helps organizations identify vendors using quantum-resistant encryption…
-
Bechtle and IQM Awarded DLR QCI Contract to Supply Superconducting Cloud Resources
Quantum Computing Report
Bechtle and IQM Quantum Computers have secured a contract with the German Aerospace Center’s Quantum Computing Initiative (DLR QCI) to provide cloud-based superconducting quantum computing resources until June 2027. This agreement will…
-
Postquant Labs Launches Quip Virtual Machine to Unify Quantum Execution Across Hardware Architectures
Quantum Computing Report
Postquant Labs has launched the Quip Virtual Machine (QVM) to standardize quantum execution across diverse hardware. The QVM features a gas-based cost model for quantum operations and has shown promising performance in benchmarking…
-
URI Students Teach Quantum Computing at Brookhaven National Laboratory
The Quantum Insider
Insider Brief University of Rhode Island students are working as teaching assistants for Brookhaven National Laboratory ‘s Quantum Information Science 101 course, helping college students learn quantum computing and programming. The…
-
Pasqal Launches Neutral-Atom Agentic Toolkit and Demonstrates QPU Workflows Across 258 Quantum Physics Papers
Quantum Computing Report
Pasqal has launched an AI-assisted workflow and an open-source Neutral-Atom Agentic Toolkit, enabling the translation of scientific papers and concepts into quantum experiments. This toolkit was validated by reproducing results from 258…
-
Study: AI Could Speed Quantum Threats — And Help Build Defenses
The Quantum Insider
Insider Brief A new analysis argues that AI could accelerate quantum threats to encryption while helping organizations prepare their defenses. Data collected in encrypted form today could remain vulnerable to future quantum attacks, making…
-
FPT and Niels Bohr Institute Sign Quantum Research Partnership
The Quantum Insider
Insider Brief FPT Corporation and the Niels Bohr Institute at the University of Copenhagen have signed a memorandum of understanding to expand cooperation in quantum science and technology between Vietnam and Denmark. The partnership will…
-
Alice ＆ Bob Reports Phase 1 Results of France’s PROQCIMA Quantum Program
Quantum Computing Report
Alice & Bob has released Phase 1 results for France's PROQCIMA quantum program, detailing technical milestones achieved with their fault-tolerant quantum computing technology. These include operating multi-qubit chips, executing…
-
Rutgers And IBM Demonstrate Real-Time Control Across 100 Qubits
The Quantum Insider
Insider Brief Researchers from Rutgers , IBM and collaborating institutions demonstrated real-time quantum feedback on up to 100 qubits, using repeated measurements and resets to control chaotic behavior. The experiment used a 156-qubit…
-
Vulcan Elements, UNC Team Up to Improve Rare Earth Magnets
The Quantum Insider
Insider Brief Vulcan Elements is partnering with the North Carolina Collaboratory and UNC-Chapel Hill to develop higher-performance rare earth magnets for defense and commercial applications. Supported by a $600,000 research award, the…
-
Structured light for addressable two-qubit gates in medium-sized ion crystals: modeling motional and dephasing errors
arXiv quant-ph
arXiv:2610.28217v1 Announce Type: new Abstract: Geometric phase gates with addressed laser radiation are widely used in trapped-ion quantum computers to drive high-fidelity entangling gates on an arbitrary qubit pair of a larger ion chain…
-
Time-Reversal and Reversible Dynamics in Cavity QED for Quantum Metrology
arXiv quant-ph
arXiv:2607.02320v2 Announce Type: replace Abstract: Quantum-enhanced metrology relies on entanglement to achieve sensitivities beyond the standard quantum limit. While remarkable progress has been made in generating highly entangled…
-
Field demonstration of a self-contained 10 km mobile-to-ground quantum network node via common-aperture co-propagation
arXiv quant-ph
arXiv:2610.27427v1 Announce Type: new Abstract: In this work, we demonstrate a dual-function, common-aperture free-space optical system that simultaneously supports decoy-state BB84 quantum key distribution (QKD) at 803 nm and…
-
On the structural properties of Lie algebras via associated labeled directed graphs
arXiv quant-ph
arXiv:2601.16161v2 Announce Type: replace-cross Abstract: We present a method for associating labeled directed graphs to finite-dimensional Lie algebras that are $graph$-$admissible$. The proposed framework enables visual identification of…
-
Minimal-length kinematics of coherent light and a proposed two-color vacuum chronoscopy
arXiv quant-ph
arXiv:2610.26892v1 Announce Type: cross Abstract: The unification of quantum theory and general relativity suggests the existence of a minimal measurable length, leading to a generalized uncertainty principle (GUP) and an energy-dependent…
-
Engineering \(XY\) and \(ZZ\) interactions between two remote superconducting qubits via a multimode waveguide
arXiv quant-ph
arXiv:2610.27471v1 Announce Type: new Abstract: Waveguides provide a flexible platform for long-range interactions between superconducting qubits. Here, we study how to engineer the effective \(XY\) and \(ZZ\) interactions between two…
-
Stabilizer R\'enyi moments beyond entanglement
arXiv quant-ph
arXiv:2610.27596v1 Announce Type: new Abstract: Stabilizer R\'enyi moments depend on a choice of operator basis and need not be determined by entanglement spectra. In this paper, we study their spatial decay in critical quantum chains…
-
Optimal Approximate Quantum Conversion from a Taut-String Principle in Majorization-Based Resource Theories
arXiv quant-ph
arXiv:2610.28015v1 Announce Type: new Abstract: Optimal approximate state conversion is a fundamental task in quantum resource theories, yet existing solutions are largely tailored to specific distinguishability measures and resource…
-
Observable-Level Framework for Finite-Key Security in Coherent-One-Way Quantum Key Distribution
arXiv quant-ph
arXiv:2610.28239v1 Announce Type: new Abstract: Practical security analysis of Coherent-One-Way (COW) quantum key distribution requires optical-device modeling, finite experimental statistics, and security inference to be treated…
-
Tensor computing application programming interface: An application-oriented, lightweight API for portable high-performance tensor network computations
arXiv quant-ph
arXiv:2512.23917v2 Announce Type: replace Abstract: Tensor networks (TNs) are a central computational tool in quantum science and artificial intelligence. However, the lack of a unified software interface across tensor-computing frameworks…
-
Hidden parabolic subgroups of $\mathrm{GL}_n$ over finite chain rings
arXiv quant-ph
arXiv:2610.28368v1 Announce Type: new Abstract: We give a bounded-error quantum polynomial-time algorithm for finding hidden parabolic subgroups of $\mathrm{GL}_n(R)$ over any effectively presented finite chain ring $R$. We call auxiliary…
-
Quantum Algorithms for Gibbs Expectation of Non-log-concave and Heavy-tailed Distributions
arXiv quant-ph
arXiv:2604.00656v2 Announce Type: replace Abstract: We establish a systematic framework of unbiased quantum sampling and estimation protocols for the classical Gibbs expectation. This framework generalizes existing approaches to the…
-
The next phase of quantum energy science: from mechanisms to applications
arXiv quant-ph
arXiv:2610.27165v1 Announce Type: new Abstract: A growing research community spanning quantum batteries, molecular and excitonic energy transport, polaritonics, quantum materials and nuclear control has begun to describe its work in terms…
-
Optimal four-copy detection of the three-tangle and its fault-tolerant cost
arXiv quant-ph
arXiv:2610.27260v1 Announce Type: new Abstract: The three-tangle, $\tau_3$, is a measure of genuine tripartite entanglement that distinguishes GHZ-type from W-type entanglement in pure three-qubit states. Here, we identify the…
-
Fates of Exact Finite-$N$ First-Order Transitions: Coherent Suppression versus Spectral-Collapse Termination
arXiv quant-ph
arXiv:2610.27780v1 Announce Type: new Abstract: Symmetry-protected ground-state crossings can produce exact first-order transitions (FOTs) even at finite $N$, in contrast to continuous transitions governed by soft-mode criticality. We…
-
The Fer expansion of a driven spin under $\mathfrak{su}(2)$ operations cannot terminate beyond first order
arXiv quant-ph
arXiv:2610.27979v1 Announce Type: new Abstract: The Fer expansion writes the propagator of a driven quantum system as an ordered product of exponentials, each generated by the time integral of an effective Hamiltonian that governs the…
-
Measurement incompatibility in Bayesian quantum estimation beyond quadratic loss
arXiv quant-ph
arXiv:2610.28070v1 Announce Type: new Abstract: In single-shot Bayesian multiparameter quantum estimation, measurement incompatibility can increase the minimum joint quadratic loss by at most a factor of two relative to the bound obtained…
-
Searching for axions with quantum interferometry
arXiv quant-ph
arXiv:2604.13181v1 Announce Type: cross Abstract: Quantum phase measurements offer a complementary route to axion searches. We show that axion-photon interactions can imprint both Aharonov-Bohm (AB) and Berry phases in experimentally…
-
Enhancement of Li and Na Storage in Janus HfSSe Monolayers by Co-Induced Electron-Deficient Chalcogen Sites: A First-Principles Study
arXiv quant-ph
arXiv:2610.28152v1 Announce Type: cross Abstract: The growing demand for high-capacity, fast-charging, and durable rechargeable batteries has intensified the search for advanced electrode materials, with two-dimensional materials offering…
-
Classical probabilistic realisation of quantum double-slit interference
arXiv quant-ph
arXiv:2607.11580v3 Announce Type: replace Abstract: We demonstrate how the interference effects for a quantum particle in the double-slit experiment can be described by classical probabilities. We investigate a classical field theory for a…
-
Wigner Time: from experimental intent to real-time laboratory control
arXiv quant-ph
arXiv:2609.06230v3 Announce Type: replace Abstract: Precisely timed, multi-device control in atomic, molecular and optical physics is provided by specialized real-time systems, which impose their own terms on the description of the…
-
Theoretical Description of Electronic Modulation and Superconducting Coherence
arXiv quant-ph
arXiv:2512.03368v3 Announce Type: replace-cross Abstract: An electronic modulation can retain a substantial local amplitude while its translational coherence is limited by spatial disorder. Its coupling to superconductivity therefore…
-
Entropy Production and Thermalization in Heavy-Quark Langevin Dynamics
arXiv quant-ph
arXiv:2610.22501v2 Announce Type: replace-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…
-
Active isolation of transmon readout with a tunable inductive bridge
arXiv quant-ph
arXiv:2610.27137v1 Announce Type: new Abstract: Scalable superconducting quantum computation requires fast, high-fidelity readout. Currently, this is assisted through cryogenic amplification of the readout signal. In traditional dispersive…
-
Shot Allocation Strategies in Debugging Quantum Circuits
arXiv quant-ph
arXiv:2610.27335v1 Announce Type: new Abstract: Debugging quantum programs remains challenging due to the nature of quantum measurement. As quantum algorithms and systems scale, it is increasingly crucial to develop rigorous debugging and…
-
Assignment maps for arbitrary reduced quantum dynamics
arXiv quant-ph
arXiv:2610.27338v1 Announce Type: new Abstract: Given an open quantum system $S$ with environment $E$, we establish a one-to-one correspondence between completely positive trace-preserving (CPTP) maps from $S$ to $E$ and assignment maps…
-
Low-nonlinearity advantage of hollow-core fiber for wavelength multiplexing of quantum entanglement and classical DWDM signals
arXiv quant-ph
arXiv:2610.27540v1 Announce Type: new Abstract: Coexistence of classical and quantum light in optical fiber is a key requirement for scalable quantum networks. However, it is fundamentally limited by nonlinear crosstalk from intense…
-
Fate of Discrete Time Crystals in Finite-Size Cavity QED Systems
arXiv quant-ph
arXiv:2610.27589v1 Announce Type: new Abstract: It has been shown that Discrete Time Crystal (DTC) behavior may arise in the periodically driven, open Dicke model in the thermodynamic limit ($N \rightarrow \infty$). In this work, we…
-
Axion detection in the non-Markovian noise
arXiv quant-ph
arXiv:2610.27731v1 Announce Type: new Abstract: The detection of axion dark matter poses a significant challenge due to its exceptionally weak coupling to standard-model particles. Here we develop a noise-tolerant quantum-metrology scheme…
-
Resolving Nonlocal State Reduction via Induced Coherence in Frequency-Comb Biphoton Sources
arXiv quant-ph
arXiv:2610.27602v1 Announce Type: new Abstract: How macroscopic definite outcomes and nonlocal correlations emerge from entangled superpositions across spacelike-separated regions without superluminal action or {\it ad hoc} wavefunction…
-
Narrowband nonreciprocal transmission in a Doppler-broadened multilevel atomic system
arXiv quant-ph
arXiv:2610.27792v1 Announce Type: new Abstract: We theoretically investigate narrowband nonreciprocal transmission in a Doppler-broadened five-level M-type atomic medium. After Doppler averaging, the M-type system retains a narrow…
-
Controlled-Z Gates via Floquet Coupling to Two Auxiliary States in Transmon Circuits
arXiv quant-ph
arXiv:2610.27834v1 Announce Type: new Abstract: High-fidelity entangling gates are essential for quantum information processing. In transmon circuits, higher excited states provide additional pathways for engineering interactions within…
-
Trapped-ion-based quantum repeater node across a 17 km metropolitan fiber
arXiv quant-ph
arXiv:2610.27854v1 Announce Type: new Abstract: Concatenation of quantum repeater nodes has been proposed as a means to distribute entanglement efficiently across future long-distance networks. Here, we demonstrate a trapped-ion repeater…
-
Sparse block encoding with low subnormalisation for quantum linear solvers on unstructured meshes
arXiv quant-ph
arXiv:2610.27915v1 Announce Type: new Abstract: Unstructured meshes are widely used in modelling and simulation in Computational Fluid Dynamics (CFD) due to their geometric flexibility. However, they require an efficient block encoding…
-
Constant-Depth Quantum Barrier Option Pricing via a Static Bivariate Oracle Framework
arXiv quant-ph
arXiv:2610.27929v1 Announce Type: new Abstract: Quantum amplitude estimation offers a theoretical quadratic speedup over classical Monte Carlo methods for financial derivative pricing. However, extending gate-based algorithms to…
-
Cooling more while dissipating less: anomalous tradeoffs from thermodynamic geometry
arXiv quant-ph
arXiv:2610.27948v1 Announce Type: new Abstract: We show that, starting from the same state, optimal driving can sometimes reach a colder (or hotter) target in the same amount of time while dissipating less energy, or equivalently dissipate…
-
A $q$-Inspired Radial Quantum Kinematics
arXiv quant-ph
arXiv:2610.28061v1 Announce Type: new Abstract: We study how the one-dimensional deformation suggested by nonadditive $q$-calculus can be extended to a rotationally covariant quantum model and what observable consequences follow from this…
-
The family of Tietz potentials
arXiv quant-ph
arXiv:2610.28126v1 Announce Type: new Abstract: We show that several potential-energy functions based on the exponential function $e^{-\alpha r}$, $\alpha > 0$, are either equivalent or identical to the Tietz potential. Some of those…
-
Dimension-free marginal inequalities for pure three-party states
arXiv quant-ph
arXiv:2610.28162v1 Announce Type: new Abstract: The quantum marginal problem, concerned with the compatibility of local and global properties of a multipartite quantum system, is arguably one of the fundamental questions in quantum theory…
-
Dynamical Mean-Field Theory for Real Materials using Variational Quantum Compressed Time Evolution on a Quantum Computer
arXiv quant-ph
arXiv:2610.28231v1 Announce Type: new Abstract: We design a hybrid quantum-classical computational workflow, combining density functional theory and dynamical mean-field theory, to investigate the electronic properties of CaCuO2, a parent…
-
Ensemble basis-free coherence for quantum communication
arXiv quant-ph
arXiv:2610.28333v1 Announce Type: new Abstract: The resource theory of coherence quantifies the quantum properties of states and their role in quantum information processing. Extending coherence theory to ensembles, the natural objects in…
-
Floquet ground state order
arXiv quant-ph
arXiv:2610.28336v1 Announce Type: new Abstract: Clean, interacting, periodically driven systems are believed to thermalize to featureless, infinite-temperature states that preclude the formation of stable ordered states. Here, we show…
-
Quantum Broker: QoS-Aware Distribution of Quantum Computations
arXiv quant-ph
arXiv:2610.28342v1 Announce Type: new Abstract: Cloud-accessible quantum computing has made heterogeneous Quantum Processing Units (QPUs) available through provider platforms that differ in qubit technology, calibration state, queueing…
-
Capturing Open Quantum System Dynamics with Compact Dressed Hamiltonians
arXiv quant-ph
arXiv:2610.28358v1 Announce Type: new Abstract: We advance the compact dressed Hamiltonian (CDH) framework to simulate the dynamics of open quantum systems strongly coupled to structured bosonic environments. The CDH approach combines…
-
Stable charged energy and phase transitions in an anisotropic Dicke quantum battery with Kerr nonlinearity
arXiv quant-ph
arXiv:2610.28373v1 Announce Type: new Abstract: Phase transitions (PTs) in quantum many-body systems offer a powerful route to manipulate the performance of quantum batteries (QBs). Here, we investigate an anisotropic Dicke QB with Kerr…
-
Scrambling Separates Superradiance from Quantum Chaos
arXiv quant-ph
arXiv:2610.28412v1 Announce Type: new Abstract: Early studies on the Dicke model linked superradiance to quantum chaos, whereas later anisotropic Dicke and Rabi studies reached apparently conflicting conclusions. We resolve this tension by…
-
Chaos and scrambling in anisotropic Dicke and Rabi models
arXiv quant-ph
arXiv:2610.28415v1 Announce Type: new Abstract: Identifying the quantum signatures of classical chaos remains a central question in quantum physics, and quantum scrambling provides a new perspective on this correspondence. We study two…
-
Tuning between collective dynamics and scrambling through initial-state symmetry alignment in long-range spin models
arXiv quant-ph
arXiv:2610.28462v1 Announce Type: new Abstract: Long-range interactions in many-body quantum systems give rise to a wide range of dynamical phenomena, from collective dynamics well described by integrable mean-field models with symmetric…
-
NeST: ultra-high-rate qLDPC codes with sub-$50\mu$s stabiliser cycles via spin shuttling
arXiv quant-ph
arXiv:2610.28538v1 Announce Type: new Abstract: Quantum low-density parity-check codes now reach encoding rates up to 50% at useful distances. Their checks however are long-range group actions, not local neighbourhoods, and that…
-
Elastic field causing noncommutativity
arXiv quant-ph
arXiv:2602.08604v1 Announce Type: cross Abstract: We study how a uniform torsion background, modeling a continuous density of screw dislocations and induces effective spatial noncommutativity and reshapes the energy spectrum of a free…
-
LatticeMind: A Validation-Gated Agentic Framework for Density Functional Theory Workflows
arXiv quant-ph
arXiv:2610.26869v1 Announce Type: cross Abstract: First-principles calculations are rarely single solver calls: they are multistage workflows in which structures, settings, and saved densities must pass correctly between dependent stages…
-
A group theoretic calculation of multi-invariants of some stabilizer states
arXiv quant-ph
arXiv:2610.27098v1 Announce Type: cross Abstract: We study multi-invariants---a multi-partite generalization of Renyi entropies---of simple stabilizer states, for an arbitrary replica symmetry group. We develop a group theoretic technique…
-
Quantum-Classical Hybrid Methods for Optimization: Lessons from Classical Decomposition
arXiv quant-ph
arXiv:2610.27362v1 Announce Type: cross Abstract: Quantum and physics-inspired solvers provide specialized sampling interfaces for Ising and quadratic unconstrained binary optimization models, but constrained optimization requires broader…
-
Moments of Random Permanents and Hafnians: A Replica Approach
arXiv quant-ph
arXiv:2610.27872v1 Announce Type: cross Abstract: Using contour-integral representations of the permanent and of the Hafnian, we turn the computation of their moments for random matrices into a replica calculation, analogous to that of the…
-
Polarization signatures of mixed scalar - pseudoscalar ALP - photon couplings in intense laser pulses
arXiv quant-ph
arXiv:2610.28144v1 Announce Type: cross Abstract: We investigate photon-to-axion-like-particle (ALP) conversion in a finite, linearly polarized laser pulse for a single ALP field with simultaneous scalar-type and pseudoscalar-type…
-
Enhanced orbital-angular-momentum dimensionality and spatial-spectral decoupling in thin-film SPDC
arXiv quant-ph
arXiv:2610.28020v1 Announce Type: cross Abstract: Thin-film spontaneous parametric down-conversion, due to the relaxed phase-matching condition, generates photon pairs that are extremely broadband in frequency and angle and highly…
-
Black Holes are about Quantum Information
arXiv quant-ph
arXiv:2610.28185v1 Announce Type: cross Abstract: We review and analyse quantum information-theoretic approaches to black hole evaporation that purport to bring us closer to a resolution of the black hole information paradox. Our focus is…
-
Dynamics of two bosons with density-assisted tunnelling in a one-dimensional tilted lattice
arXiv quant-ph
arXiv:2610.28278v1 Announce Type: cross Abstract: We investigate the dynamics of two bosons in a tilted one-dimensional optical lattice with both standard and density-assisted tunnelling. The relative sign of the two tunnelling processes…
-
Entanglement Distribution in Quantum Switch Networks: Memory Limits and Achievability
arXiv quant-ph
arXiv:2610.28596v1 Announce Type: cross Abstract: We study the minimum persistent memory required to distribute a graph state through a quantum switch. Specifically, consider a central switch that assists $n$ remote users in distributing a…
-
Correlated emission of electron-current waves
arXiv quant-ph
arXiv:2505.24052v2 Announce Type: replace Abstract: Correlated emission of light offers a potential avenue for entanglement generation between atomic spins, with potential application for sensing and quantum memory. In this work, we…
-
QUT: A Unit Testing Framework for Quantum Subroutines
arXiv quant-ph
arXiv:2509.17538v3 Announce Type: replace Abstract: We present the architectural design and prototype implementation of QUT (Quantum Unit Testing), a framework for unit testing of quantum subroutines. The framework is developed with a…
-
Temporal entanglement transition in chaotic quantum many-body dynamics
arXiv quant-ph
arXiv:2511.03846v3 Announce Type: replace Abstract: Temporal entanglement (TE) of an influence matrix (IM) has been proposed as a measure of complexity of simulating dynamics of local observables in a many-body system. Foligno et al…
-
Multipath wave-particle duality with exact quantification of which-path knowledge
arXiv quant-ph
arXiv:2601.13083v2 Announce Type: replace Abstract: A quantum system (quanton) traverses an interferometer with $N$ equally probable paths and interacts with another quantum system (detector) that stores path information in a set of…
-
A Route to Quantum-Coherent Thermodynamics
arXiv quant-ph
arXiv:2602.12212v4 Announce Type: replace Abstract: Equilibrium thermodynamics emerges because a vast number of microscopic states become indistinguishable at the level of local observables. We start from the observation that a…
-
Deterministic feedforward-based generation of large optical coherent-state superposition
arXiv quant-ph
arXiv:2603.22068v2 Announce Type: replace Abstract: Large optical coherent-state superpositions are essential to advance quantum sensing, quantum repeaters and error-correction codes. We propose a deterministic feedforward protocol…
-
QML-PipeGuard: Detecting Channel-Substitution Attacks on Quantum Machine Learning Pipelines in Untrusted Clouds
arXiv quant-ph
arXiv:2605.25066v2 Announce Type: replace Abstract: As machine-learning workloads move onto quantum hardware they inherit a trust problem classical AI deployments have largely solved and quantum ones have not: quantum machine learning…
-
Complete Relational Description of Spin in a Quantum Background
arXiv quant-ph
arXiv:2606.15873v3 Announce Type: replace Abstract: The standard description of the state of a spin in quantum mechanics presupposes externally fixed directions -- a classical background. Can a spin be fully described instead in relation…
-
Searching for Axion Dark Matter via Superconductor-Spin Hybrid Magnetometers
arXiv quant-ph
arXiv:2610.27764v1 Announce Type: cross Abstract: Axions are a compelling dark matter candidate suggested by theories beyond the Standard Model. The predicted axion-electron coupling and the resulting pseudomagnetic field allow for…
-
Taming Spacetime Overhead and Design Complexity in Distributed Fault-Tolerant Superconducting Quantum Computation
arXiv quant-ph
arXiv:2608.23159v2 Announce Type: replace Abstract: Scaling fault-tolerant superconducting quantum computers will likely require distributed architectures built from multiple manufacturable quantum processing units. A central question is…
-
Local Optimality Does Not Compose: Invariant Simplices and the Complexity of Shared Probabilistic Automata
arXiv quant-ph
arXiv:2609.19707v4 Announce Type: replace Abstract: Probabilistic models are often constructed separately for different test suites and then expected to share a single latent dynamical system. We study bounded-state shared realization for…
-
Observable-targeted variational quantum simulation of Hamiltonian dynamics
arXiv quant-ph
arXiv:2609.24794v2 Announce Type: replace Abstract: Standard variational quantum simulation seeks to reproduce the evolution of the full quantum state, although many applications require only the expectation values of a few observables. We…
-
Angular momentum conservation in two-atom superradiance
arXiv quant-ph
arXiv:2609.31433v2 Announce Type: replace Abstract: Two-atom superradiance is studied for atoms having a J=0 ground state and a J=1 excited state. The atoms lie on the x-axis and are excited by a \sigma_{+}-polarized laser pulse…
-
Gap-Protected Heisenberg-Limited Squeezing with Locally Interacting Multi-Level Spins
arXiv quant-ph
arXiv:2610.02314v2 Announce Type: replace Abstract: We demonstrate a general mechanism to generate scalable, metrologically useful entanglement in the form of generalized spin squeezing in multi-level (qudit) spin systems with power-law…
-
Pauli Decomposition by Character Theory: A Memory-Bounded Algorithm for Qubits and Qudits
arXiv quant-ph
arXiv:2610.08299v2 Announce Type: replace Abstract: Pauli decomposition of an $n$-qubit operator is expensive if each of the $4^n$ Pauli strings is treated as an unstructured object. Labeling those strings by the configuration space…
-
Local finite rate semi device independent randomness expansion from quantum contextuality
arXiv quant-ph
arXiv:2610.21765v2 Announce Type: replace Abstract: Finite rate randomness expansion (RE) which is secure against quantum adversaries is a crucial information processing task which is well studied in the case of two non-communicating…
-
The JLMS formula in a large code with approximate error correction
arXiv quant-ph
arXiv:2601.00442v3 Announce Type: replace-cross Abstract: Gauge/gravity duality is often described as a quantum error correcting code. However, as seen in the Jafferis-Lewkowycz-Maldacena-Suh (JLMS) formula, exact quantum error correction…
-
Graph-Theoretic Analysis of Phase Optimization Complexity in Variational Wave Functions for Heisenberg Antiferromagnets
arXiv quant-ph
arXiv:2602.04943v4 Announce Type: replace-cross Abstract: We study the computational complexity of learning the ground state phase structure of Heisenberg antiferromagnets. Representing Hilbert space as a weighted graph, the variational…
-
Finite-Dimensional Type I von Neumann Algebras in PyTorch: A GPU-Accelerated Framework for Random Block-Diagonal Operators
arXiv quant-ph
arXiv:2606.15882v2 Announce Type: replace-cross Abstract: torch_vn_algebra is a PyTorch library for numerical work with finite-dimensional von Neumann algebras, i.e. direct sums of matrix algebras. These algebras are central to operator…
-
A quadratic Grassmann manifold optimization problem arising from quantum embedding methods
arXiv quant-ph
arXiv:2603.17080v2 Announce Type: replace-cross Abstract: This article presents a mathematical analysis and numerical strategies for solving the optimization problem of minimizing the quadratic function $J(P) = \text{Tr}(BP)- \frac{1}{2}…
-
Interplay between photon condensation and electron-electron interactions in molecular systems
arXiv quant-ph
arXiv:2606.11060v2 Announce Type: replace-cross Abstract: We investigate a minimal molecular model consisting of square planar plaquettes hosting multiple electrons, whose dynamics is governed by a tight-binding Hamiltonian supplemented by…
-
Multiparameter Quantum Estimation and Degeneracy Structure in Three-Flavor Neutrino Oscillations
arXiv quant-ph
arXiv:2606.30222v2 Announce Type: replace-cross Abstract: We investigate three-flavor neutrino oscillations within the framework of quantum estimation theory using the quantum Fisher information matrix (QFIM). We analyze all six…
-
Genuine Multi-Entropy in the Toric Code
arXiv quant-ph
arXiv:2607.06050v2 Announce Type: replace-cross Abstract: We study genuine multi-entropy as a diagnostic of multipartite entanglement in the toric code, which provides a controlled setting for probing multipartite structures in…
-
A semiconductor photon-pair source based on a polariton cascade
arXiv quant-ph
arXiv:2609.17900v2 Announce Type: replace-cross Abstract: We present a theoretical study of a semiconductor photon-pair source based on a radiative cascade enabled by a permanent exciton dipole. The source consists of a GaAs quantum dot…
-
Interacting quantum criticality with U(1) symmetry breaking in 1+1 dimensions
arXiv quant-ph
arXiv:2610.06682v2 Announce Type: replace-cross Abstract: The Hohenberg-Mermin-Wagner theorem motivates the expectation that continuous symmetry remains unbroken in one-dimensional quantum ground states. Here, contrary to this expectation…
-
Norm properties of quantum uniformity measures
arXiv quant-ph
arXiv:2610.17454v2 Announce Type: replace-cross Abstract: We give a complete classification of the norm properties of quantum uniformity measures, introduced by Bu, Gu, and Jaffe to analytically characterize the Clifford hierarchy…
-
Boundary-induced geometrical frustration in a square Rydberg-atom lattice
arXiv quant-ph
arXiv:2610.20723v2 Announce Type: replace-cross Abstract: We study geometric defects in square-lattice Rydberg-atom arrays induced by lattice-size parity in the striated density-wave phase. While odd-sized lattices select a single striated…
-
Mechanical quality factor estimation from a nonlinear optical cavity response
arXiv quant-ph
arXiv:2609.07393v2 Announce Type: replace-cross Abstract: Intrinsic damping rate and quality factor ($Q$) are key parameters in optomechanical systems. However, in high-Q devices, their measurement is often challenging because…
-
Optimal Quantum-Circuit Synthesis and Implementation of General Unitaries with Parallelized Bitstring-Conditioned Rotations
arXiv quant-ph
arXiv:2610.28057v1 Announce Type: new Abstract: We theoretically introduce a quantum-circuit synthesis protocol to realize any $n$-qubit transformation $U\in U(2^n)$, up to a diagonal. The resulting circuit is directly native to and…
-
Relativistic Strong Quantum Mpemba Effect
arXiv quant-ph
arXiv:2610.28017v1 Announce Type: new Abstract: The Unruh effect links acceleration to thermalization, providing a relativistic setting for anomalous quantum relaxation. We demonstrate a {\it relativistic} strong quantum Mpemba effect in…
-
PPVM: A Circuit Simulation Framework for Digital Twins of Quantum Processors
arXiv quant-ph
arXiv:2610.18225v2 Announce Type: replace Abstract: Quantum computers are approaching the early fault-tolerant regime. Verifying the next generation of quantum hardware requires joint emulation of the quantum processor, hardware noise, and…
-
Allight: A Perfect Photon Collector
arXiv quant-ph
arXiv:2610.27161v1 Announce Type: cross Abstract: Collecting photons from quantum emitters remains a key limitation in light-matter interaction because conventional lenses collect light only from one direction. Here, we introduce a perfect…
-
Scalable Tomography of Coherent Noise via Stabilizer-Code Polarization
arXiv quant-ph
arXiv:2610.19779v4 Announce Type: replace Abstract: Coherent errors accumulate linearly rather than diffusively, making them invisible to Pauli-twirl-based char- acterization. It poses a central challenge for quantum error correction, yet…
-
Gaussian continuous tensor network states: short-distance properties and imaginary-time evolution
arXiv quant-ph
arXiv:2602.15987v2 Announce Type: replace-cross Abstract: We study Gaussian continuous tensor network states (GCTNS) - a finitely parameterized subclass of Gaussian states admitting an interpretation as continuum limits of discrete tensor…
-
Near-deterministic loading of molecular arrays by microwave-assisted collisions
arXiv quant-ph
arXiv:2607.25783v3 Announce Type: replace-cross Abstract: Molecular tweezer arrays offer great prospects for quantum simulation, sensing, and computing, and would benefit from methods that enhance loading efficiency. Whereas light-assisted…
-
QMBL: the Quantum Many-Body Leaderboard. A live record of published ground-state energies for lattice Hamiltonians and the electron gas
arXiv quant-ph
arXiv:2610.22387v2 Announce Type: replace-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…
-
CO$\Phi$ - COmpiling PHotonics into dIgital quantum circuits
arXiv quant-ph
arXiv:2610.28349v1 Announce Type: new Abstract: Photonic and qubit-based (digital) approaches to quantum computing are largely regarded as separate paradigms. This article aims to bridge these paradigms by developing a method for mapping…
-
Single-photon time qubit: Quantum-vacuum control and complementarity of the arrow of time
arXiv quant-ph
arXiv:2610.27639v1 Announce Type: new Abstract: Treating the arrow of time as a controllable quantum variable rather than a fixed external parameter is a central challenge in quantum physics. Recently, Bloch~\cite{Bloch2025} proposed the…
-
Quantum algorithm for high-dimensional nonlinear stochastic differential equations based on Carleman linearization
arXiv quant-ph
arXiv:2610.27416v1 Announce Type: new Abstract: Addressing nonlinear numerical problems in quantum computing remains challenging, but several approaches, including Carleman linearization (CL), have been proposed to construct quantum…
-
Systematic Truncated Wigner Approximation for Open Spin Systems Reveals Long-Range Order Far from Equilibrium
arXiv quant-ph
arXiv:2610.27462v1 Announce Type: new Abstract: Long-range interactions can protect dissipative order against fluctuations, but determining when they do so in two dimensions remains out of reach for existing many-body methods. We develop a…
-
Local-Channel Stability of Classical $\mathbb Z_2$ Lattice Gauge Models
arXiv quant-ph
arXiv:2610.27939v1 Announce Type: new Abstract: We establish sufficient conditions for two-way local quantum-channel stability in classical $\mathbb Z_2$ lattice gauge models with spins on $m$-dimensional cells of a $d$-dimensional…
-
Quantum Simulation of the Static Yukawa Model via Effective Particles on a Trapped-Ion Quantum Simulator
arXiv quant-ph
arXiv:2610.28453v1 Announce Type: new Abstract: Trapped-ion, neutral-atom, and circuit QED quantum computers naturally enable coupled qubit-boson simulations. Boson-fermion interactions arise in quantum field theory, where renormalization…
-
Efficient Ground-State Manifold Amplification for Rydberg Atom Arrays via Houdayer Cluster Updates
arXiv quant-ph
arXiv:2610.28528v1 Announce Type: new Abstract: We demonstrate a hybrid quantum-classical approach for exploring ground-state manifolds of maximum independent set problems, in which quantum hardware supplies the initial solutions and an…
-
Symmetry and Quantum Interference in the Attosecond Domain
arXiv quant-ph
arXiv:2610.26901v1 Announce Type: cross Abstract: In this review, we examine the interplay of symmetry and quantum interference in the attosecond domain primarily through one- and two-electron photoelectron momentum distributions. Using…
-
Nambu-Goldstone Bosons and Quantum Fisher Information
arXiv quant-ph
arXiv:2610.27054v1 Announce Type: cross Abstract: The quantum Fisher matrix and geometric tensor are powerful tools for quantifying the nature of quantum systems. Unfortunately, the formalism needed to compute these quantities is opaque…
-
Counterexamples to the total-current Hohenberg-Kohn conjecture
arXiv quant-ph
arXiv:2610.27294v1 Announce Type: cross Abstract: The total-current Hohenberg-Kohn conjecture asserts that the ground-state particle density and total current determine the scalar potential up to an additive constant and the vector…
-
Steering of topological criticality in the Su-Schrieffer-Heeger chain via non-Hermitian substitutional impurities
arXiv quant-ph
arXiv:2610.27436v1 Announce Type: cross Abstract: We investigate the topological phase in a one-dimensional Su-Schrieffer-Heeger (SSH) chain in the presence of a finite concentration of non-Hermitian substitutional impurities. Our primary…
-
Atmospheric channel model for QKD over satellite megaconstellations
arXiv quant-ph
arXiv:2610.27856v1 Announce Type: cross Abstract: Atmospheric turbulence and channel loss represent the primary limiting factors in ground-to-satellite quantum communication systems, yet their joint impact remains insufficiently…
-
Computing excited states of dipolar Bose--Einstein condensates by constrained gentlest ascent dynamics
arXiv quant-ph
arXiv:2610.27878v1 Announce Type: cross Abstract: Dipolar Bose--Einstein condensates (BECs), i.e., BECs with long-range dipole-dipole interactions (DDI), exhibit extraordinarily rich physics and serve as a versatile experimental platform…
-
Certified Non-Degenerate Maximum-Likelihood Benchmarking of Quantum LDPC Decoders
arXiv quant-ph
arXiv:2610.28008v1 Announce Type: cross Abstract: The measured logical error rate of a quantum low-density parity-check (QLDPC) code depends on the decoding algorithm. We develop a framework that certifies non-degenerate maximum-likelihood…
-
Characterizing supersolid phase transitions in trapped quantum gases with tilted dipoles at finite temperature
arXiv quant-ph
arXiv:2610.28621v1 Announce Type: cross Abstract: Motivated by a recent experimental work $[\href{https://arxiv.org/abs/2608.20327}{\text{arXiv:}2608.20327}]$, we theoretically investigate the nature of phase transitions in a trapped…
-
Variational Perturbation Theory in Open Quantum Systems for Efficient Steady State Computation
arXiv quant-ph
arXiv:2504.00085v4 Announce Type: replace Abstract: Determining the steady state of an open quantum system is crucial for characterizing quantum devices and studying various physical phenomena. Often, computing a single steady state is…
-
On the hardness of approximating minimum distances of quantum codes
arXiv quant-ph
arXiv:2509.21469v3 Announce Type: replace Abstract: The problem of computing distances of error-correcting codes is fundamental in both the classical and quantum settings. While hardness for the classical version of these problems has been…
-
Cooperative control of dissipative qubits: steering along the fastest dissipative contraction
arXiv quant-ph
arXiv:2606.30073v3 Announce Type: replace Abstract: In the control of dissipative quantum systems, the slow relaxation modes usually set the ultimate manipulation timescale. We show that this bottleneck can be bypassed when dissipation…
-
The Low-Individual-Degree Test Without the Diagonal-Lines Test Is Not Quantum-Sound
arXiv quant-ph
arXiv:2609.12346v2 Announce Type: replace Abstract: To prove the quantum soundness of the classical low-individual-degree test, the authors of \cite{JNVWY20LID} defined three subtests, namely the axis-parallel lines test, the…
-
Quantum Soundness of a Total-Degree Line-versus-Point Test
arXiv quant-ph
arXiv:2609.27129v2 Announce Type: replace Abstract: We prove quantum soundness of the total-degree diagonal line-vs-point test using the individual-degree soundness theorem of Ji, Natarajan, Vidick, Wright, and Yuen. A random change of…
-
Near-Optimal Quantum Algorithm and Complexity Analysis for Riccati Problems
arXiv quant-ph
arXiv:2609.37207v2 Announce Type: replace Abstract: We develop quantum algorithms that construct block-encodings of solution matrices for continuous- and discrete-time algebraic Riccati equations (CAREs and DAREs), differential Riccati…
-
Classical Verification of a Remote Quantum Processor via Degenerate Concordant Computations: An Application to Randomness Generation
arXiv quant-ph
arXiv:2610.08185v2 Announce Type: replace Abstract: A client renting a cloud quantum processor cannot easily tell whether its bitstrings came from a quantum device. Certification by random circuit sampling runs on present hardware, but…
-
Tunable state-dependent interactions in collisionally stable mixtures of polar molecules
arXiv quant-ph
arXiv:2607.25777v3 Announce Type: replace-cross Abstract: We propose encoding a pseudo-spin-$1/2$ system in the ground ($v=0$) and first excited ($v=1$) vibrational states of polar molecules. Double microwave shielding simultaneously…
-
Ising-machine-like Driving Condition Restrictions in SSBM and Additional Pseudo-annealing- Driving Method for SSBM that Achieves Best Cut Value Search -
arXiv quant-ph
arXiv:2608.12545v3 Announce Type: replace-cross Abstract: In our previous work, we proposed and experimentally demonstrated a physics-based simulator for combinatorial optimization problems (SSBM), which exploits a distinctive spontaneous…
-
Non-planar contact structures with Calabi-Yau Fillings and topological quantum computation
arXiv quant-ph
arXiv:2610.25878v2 Announce Type: replace-cross Abstract: This paper is a non-planar counterpart of the author's earlier work on planar contact structures and topological quantum computation. On a planar page every branch point is paired…
-
Controlling Optical Quantum Interference with Plasmonic Metasurfaces
arXiv quant-ph
arXiv:2610.27226v1 Announce Type: cross Abstract: The ability to efficiently control optical quantum interference by the same device is a challenging task that promises to enable key operations in quantum information processing. Here, we…
-
Quantum entanglement and contextuality with complexifications of $E_8$ root system
arXiv quant-ph
arXiv:2210.15338v4 Announce Type: replace Abstract: The Witting configuration with 40 complex rays was suggested as a possible reformulation of Penrose model with two spin-3/2 systems based on geometry of dodecahedron and used for analysis…
-
One pure steered state implies Einstein-Podolsky-Rosen steering for two-qubit entangled states
arXiv quant-ph
arXiv:2605.18243v3 Announce Type: replace Abstract: In this work, we show that a two-qubit entangled state admitting at least one pure steered state is Einstein-Podolsky-Rosen (EPR) steerable from Alice to Bob. Pure steered states…
-
Proof-of-Principle Implementation of Quantum Key Distribution in an Indefinite Causal Order
arXiv quant-ph
arXiv:2608.13561v2 Announce Type: replace Abstract: In quantum physics, the order in which different operations occur can be placed in superposition. The resulting processes have an indefinite causal order, which is of fundamental interest…
-
Parallel Quantum Advantage with Limited Adaptivity Requires Structure
arXiv quant-ph
arXiv:2608.20297v2 Announce Type: replace Abstract: Aaronson and Ambainis (Theory of Computing, 2014) conjectured that quantum query algorithms admit efficient almost-everywhere classical simulation: for any $T$-query quantum algorithm…
-
Riemannian Formulation of Sample-Based Quantum Krylov Solvers for Elliptic Problems: Energy-Norm Guarantees and Duct-Flow Applications
arXiv quant-ph
arXiv:2610.15586v4 Announce Type: replace Abstract: Sample-based quantum linear solvers measure quantum Krylov states $e^{-iAT}|b\rangle$ and reconstruct the solution of $Ax=b$ classically on the observed basis states. We develop this…
-
Majorana Edge Modes Reshape Kibble-Zurek Scaling in Kitaev Honeycomb Ribbons
arXiv quant-ph
arXiv:2610.19923v2 Announce Type: replace Abstract: Recent progress in programmable quantum simulators motivates exact benchmarks for nonequilibrium dynamics in topological quantum matter. We study the Kitaev honeycomb model driven through…
-
Parallel Omnidirectional Atom Rearrangement with Dynamic Holograms
arXiv quant-ph
arXiv:2610.27053v1 Announce Type: cross Abstract: The ability to assemble and reconfigure individual atoms is central to performing quantum science using optical tweezer arrays. Here, we demonstrate parallel omnidirectional atom transport…
-
Higher-Order Magnus Corrections to Leakage Elimination Operator-Based Quantum Control Pulse Design in the Low-Frequency Regime
arXiv quant-ph
arXiv:2606.29854v2 Announce Type: replace Abstract: Effective quantum control is essential for quantum computing and information processing, yet level leakage remains a bottleneck limiting control fidelity. The leakage elimination operator…
-
Parallel Teleportation via AME(5,2) States on IBM Quantum Hardware
arXiv quant-ph
arXiv:2610.28204v1 Announce Type: new Abstract: The five-qubit Absolutely Maximally Entangled AME$(5,2)$ state, whose every pair of qubits is maximally mixed so that all its information lives in non-local correlations, could in principle…
-
Temperature Beyond Equilibrium in Isolated Quantum Many-Body Systems and Their Subsystems
arXiv quant-ph
arXiv:2607.08655v3 Announce Type: replace Abstract: Temperature is one of the central concepts of thermodynamics, yet its meaning far from equilibrium remains unclear. The problem is especially challenging in isolated quantum many-body…
-
Magic and Wormholes in the Sachdev-Ye-Kitaev Model
arXiv quant-ph
arXiv:2602.12339v3 Announce Type: replace-cross Abstract: Any quantum state is fully specified by the expectation values of a complete set of Hermitian operators. For a system of Majorana fermions, such as the Sachdev-Ye-Kitaev (SYK)…
-
Microscopic Bipartition and Macroscopic Symmetry in a R\'enyi Entanglement Ensemble
arXiv quant-ph
arXiv:2610.27587v1 Announce Type: new Abstract: Universal information extracted from entanglement at a critical point is commonly associated with the long-distance properties of the bulk state, while microscopic details of a lattice…