Quantum Computing
Quantum Computing news — Friday 09 October 2026
150 stories from 3 sources, every one in English. Each links to its publisher.
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Podcast with Harry Kumar, Co-founder, Director ＆ CCO of Moth Quantum
Quantum Computing Report
Interview with Harry Kumar, co-founder, director, and Chief Creative Officer of Moth Quantum. Moth is the company behind Quantum Backrooms, a browser game whose maze is generated on real quantum hardware. The post Podcast with Harry Kumar…
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University of Auckland, NIST, and UMD Demonstrate Octave-Spanning Chip-Scale Microcomb in Nature
Quantum Computing Report
Researchers from the University of Auckland, NIST, UMD, and UC Santa Barbara have developed a chip-integrated optical frequency comb that addresses long-standing stability and control issues in microcomb metrology. They achieved this by…
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Tuning a quantum computer: what a violin teaches us about qubit calibration
The Quantum Insider
Insider brief A new episode of The Quantum Kid’s Kai Asks series uses a violin to explain qubit calibration, featuring Kristina Callaghan, Quantum Education & Workforce Development Program Manager at Quantum Machines. Because of tiny…
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Arqit Quantum Inc. Reports Select Preliminary FY 2026 Financial Results: Annual Revenue Tops $975K, NATO Contract Win, and Cash Position Reaches $51M
Quantum Computing Report
Arqit Quantum Inc. reported strong preliminary financial results for FY 2026, with annual revenue estimated between $975,000 and $1,000,000, an 84% to 89% increase from FY 2025. The company also secured a NATO contract and ended the fiscal…
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Quantinuum and HQS Simulate 21-Spin NMR Spectrum on 42 Qubits With 1,400+ Two-Qubit Gate Circuits
Quantum Computing Report
Quantinuum and HQS Quantum Simulations successfully simulated a 21-spin NMR spectrum on Quantinuum's 42-qubit quantum computer, the H2-1. This simulation, which modeled 1,2-di-tert-butyl-diphosphane, demonstrated the viability of deep…
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Fujitsu Partners with State of New Mexico to Establish Quantum Computing R＆D Center
Quantum Computing Report
Fujitsu is partnering with the State of New Mexico to establish a quantum computing R&D center, focusing on hardware, software, and algorithm design. This collaboration expands on existing research with New Mexico universities and…
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Quobly and SiPearl Form Partnership to Integrate European ARM CPUs and Silicon Spin QPUs
Quantum Computing Report
Quobly and SiPearl have partnered to integrate SiPearl's ARM-based Rhea1 CPU with Quobly's silicon QPU hardware, aiming for hybrid CPU-QPU co-design and HPC-quantum workload optimization. This collaboration will establish a…
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IonQ Demonstrates 1 kHz Memory-Enhanced Quantum Interconnect Connecting Trapped Ions and Diamond Color Centers
Quantum Computing Report
IonQ has achieved a breakthrough in quantum computing with a memory-enhanced quantum interconnect, linking a trapped ion qubit with a diamond-based quantum memory. This system operates at a record-breaking entanglement rate of over 1 kHz…
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Guest Post: Quantum Computing’s Transistor Moment
The Quantum Insider
A new paper demonstrating Grover’s search on a room-temperature diamond processor may echo the transistor’s takeover from vacuum tubes – and raises questions about how much vacuum-dependent quantum hardware survives the same transition…
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NTT DOCOMO BUSINESS Partners with Classiq to Expand Enterprise Quantum Software Adoption in Japan
Quantum Computing Report
NTT DOCOMO BUSINESS has partnered with Classiq to distribute Classiq's quantum software development platform in Japan, aiming to expand quantum computing adoption across various enterprise sectors. This collaboration leverages NTT DOCOMO…
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IonQ Demonstrates 1,000 Entanglement Events per Second in Quantum Interconnect
The Quantum Insider
Insider Brief IonQ has demonstrated entanglement rates exceeding 1,000 events per second between a trapped-ion qubit and a silicon-vacancy solid-state quantum memory using a photonic interconnect. The company says the result is more than…
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Quantum X Labs Seeks Patent for Structured-Beam Atom Cooling System
The Quantum Insider
Insider Brief Quantum X Labs has filed a USPTO patent application for a structured-beam Zeeman slower and atomic push-beam system for its cold-atom quantum computing program. The proposed technology uses non-Gaussian optical beam profiles…
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BTQ and MoonPay Korea Partner on Post-Quantum Stablecoin Security
The Quantum Insider
Insider Brief BTQ Technologies has partnered with MoonPay Korea to secure its Korean won-backed stablecoin infrastructure, with a focus on post-quantum cryptography (PQC). The companies plan to develop a post-quantum security roadmap and…
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izmo Microsystems and IIT Madras Advance ₹99.94 Crore Silicon Photonics Program
The Quantum Insider
Insider Brief izmo Microsystems and IIT Madras have entered Phase II of the Centre for Programmable Photonic Integrated Circuits and Systems (CPPICS), a five-year silicon photonics program with a total outlay of ₹99.94 crore. The SPECTRA…
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Chattanooga Quantum Collaborative Graduates First Quantum Ready Cohort
The Quantum Insider
Insider Brief The Chattanooga Quantum Collaborative (CQC) has graduated 17 professionals from 16 Tennessee employers from its 12-week Quantum Ready Pre-Apprenticeship program. Participants received training in quantum computing, networking…
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Quobly and SiPearl Partner to Explore European CPU-QPU Integration For Sovereign Quantum Computing
The Quantum Insider
Insider Brief Quobly and SiPearl signed a non-exclusive agreement to explore combining silicon spin quantum processors with European CPUs to support a sovereign European quantum computing system. The initial phase will assess integrating…
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Technology Used by Optical Atomic Clocks May Jump From Lab to Consumer
The Quantum Insider
Insider Brief University of Auckland and U.S. researchers demonstrated a chip-based optical frequency comb that could support smaller precision measurement systems, including portable atomic clocks. The design uses two lasers with…
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Quantum Elements’ Constellation Wins TMCnet 2026 Quantum Computing Product Award
The Quantum Insider
Insider Brief Quantum Elements ’ Constellation platform has been named a winner of TMCnet’s inaugural 2026 Quantum Computing Product of the Year Awards. Constellation provides a hardware-aware development environment for designing, testing…
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Experimental generation of asymmetric keys from the parity structure of a two-photon six-qubit entangled state
arXiv quant-ph
arXiv:2610.12264v1 Announce Type: new Abstract: We propose and experimentally demonstrate an asymmetric key-generation scheme in which public and private keys are derived from a six-qubit photonic entangled state. A six-qubit entangled…
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Accessing electronic entanglement via photo-assisted two-electron tomography
arXiv quant-ph
arXiv:2610.12286v1 Announce Type: cross Abstract: Witnessing entanglement between electrons propagating in quantum circuits requires accessing their two-electron coherences, which encode the two-particle quantum correlations generated by…
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Compilation-informed probabilistic logical-error cancellation
arXiv quant-ph
arXiv:2508.20174v3 Announce Type: replace Abstract: The potential of quantum computers to outperform classical ones in practically useful tasks remains challenging in the near term due to scaling limitations and high error rates of current…
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Kinematic properties of the Pauli equation
arXiv quant-ph
arXiv:2606.17548v2 Announce Type: replace Abstract: Based on the Wigner-Vlasov formalism, this paper investigates the kinematic properties of the Pauli equation. It is shown that the probability current associated with the Pauli equation…
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Beyond Hardware: Adaptive Algorithmic Control by State-Proxy Equalization
arXiv quant-ph
arXiv:2609.17497v2 Announce Type: replace Abstract: Recent advances in quantum computing have been driven primarily by improvements in hardware. Here we show that substantial gains can instead arise from how finite computational resources…
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An Efficient Quantum Circuit for Flow Model Execution Using Quantum Neural Networks
arXiv quant-ph
arXiv:2610.11537v1 Announce Type: new Abstract: Flow models generate trajectories from an initial distribution to a target distribution by solving an ordinary differential equation defined by a velocity field. Flow matching learns this…
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Scattering entanglement entropy between one particle species and the others
arXiv quant-ph
arXiv:2610.10704v1 Announce Type: cross Abstract: We construct the entanglement entropy of a general scattering process between one particle species (denoted as $A$) and the rest of the final state. Assuming a pure initial momentum…
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Non-Perturbative Vibrational Excitation by Arbitrary Electric Fields from Classical Phase-Space Dynamics
arXiv quant-ph
arXiv:2610.11686v1 Announce Type: cross Abstract: We present a non-perturbative framework for the quantum treatment of vibrational excitation in molecular systems driven by electric fields with arbitrary time dependence. For harmonic…
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Criticality on R\'enyi Defects at (2+1)$D$ O(3) Quantum Critical Points
arXiv quant-ph
arXiv:2605.00104v3 Announce Type: replace-cross Abstract: At a quantum critical point, the universal scaling behavior of R\'enyi entanglement entropy is controlled by the universality class of the codimension-two R\'enyi (or conical)…
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Structured leakage in OAM-encoded qubits revealed by distributed quantum feature extraction
arXiv quant-ph
arXiv:2610.11001v1 Announce Type: new Abstract: Orbital angular momentum (OAM) modes have emerged as an important platform for high-dimensional quantum communication but remain vulnerable to environmental noise and channel imperfections…
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Quartic Certificates for Pure-State Tomography with Pauli Measurements
arXiv quant-ph
arXiv:2610.12320v1 Announce Type: new Abstract: Full Pauli-basis tomography of an arbitrary $n$-qubit state uses the expectation values of all nonidentity Pauli observables. For multiqubit systems, prior knowledge that the state is pure…
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Characterization and Active Control of Position-Dependent Timing Dynamics in Superconducting Strip Single-Photon Detectors
arXiv quant-ph
arXiv:2609.28897v2 Announce Type: replace-cross Abstract: Superconducting strip single-photon detectors (SSPDs) have emerged as scalable, wide-strip variants of traditional nanowire counterparts. Despite practical advantages including…
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Scaling Quantum Optimization to the Thousand-Qubit Scale with Distributed Quantum Sampling
arXiv quant-ph
arXiv:2610.10772v1 Announce Type: new Abstract: The Minimum Birkhoff Decomposition (MBD) seeks a sparse weighted sum of matchings and is a challenging optimization problem with applications in network scheduling and energy trading. We…
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Optimal Diffractive Focusing of Vortex Beams
arXiv quant-ph
arXiv:2610.10842v1 Announce Type: cross Abstract: We formulate diffractive ring focusing of paraxial beams carrying orbital angular momentum (OAM) through a finite circular aperture as a variational optimization problem. For a fixed…
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Parallel and Distributed Fermionic Simulation via Dynamic Encoding
arXiv quant-ph
arXiv:2609.31502v2 Announce Type: replace Abstract: We demonstrate a simple and efficient method to parallelize and distribute Trotterized Hamiltonian simulation of fermionic systems across multiple QPUs. Using combinatorial covering…
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Robust Excitonic Coherence Driven by In-Plane Anisotropy in a van der Waals Semiconductor
arXiv quant-ph
arXiv:2411.13695v2 Announce Type: replace-cross Abstract: The discovery of in-plane anisotropic excitons in van der Waals semiconductors enables state-of-the-art nanophotonic applications. A key parameter of these quasiparticles is the…
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Quantum Magic and the Strong Coupling Constant
arXiv quant-ph
arXiv:2610.11121v1 Announce Type: cross Abstract: The three gauge couplings of the Standard Model (SM) can be parameterized as the fine structure constant $\alpha$, the weak mixing angle $\sin^2\theta_w$, and the strong coupling…
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Confinement-Tunable Synthetic Gauge Fields and Floquet Topological Phenomena in a Driven Quantum Wire Qubit
arXiv quant-ph
arXiv:2601.13859v3 Announce Type: replace-cross Abstract: Theoretical analysis indicates that a spin qubit in a parabolic quantum wire, when driven by a bichromatic field, generates a confinement-tunable non-Abelian synthetic gauge field…
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Shortcuts for Adiabatic and Variational Algorithms in Molecular Simulation
arXiv quant-ph
arXiv:2407.20957v2 Announce Type: replace Abstract: Quantum algorithms offer a promising route toward computational advantage, but current implementations remain constrained by limited coherence and gate errors, making circuit complexity…
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Multipartite entanglement in the quantum tetrahedron
arXiv quant-ph
arXiv:2601.14964v2 Announce Type: replace Abstract: The space Inv$(j_1,j_2,j_3,j_4)$ of SU(2)-invariant four-valent tensors, also known as intertwiners, can be understood as the quantum states of a tetrahedron in Euclidean space with fixed…
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Broadband and Large-Multimode Quantum Optical Storage with Rare-Earth Ions in Solids
arXiv quant-ph
arXiv:2609.28271v3 Announce Type: replace Abstract: Broadband quantum memory devices are essential elements for future quantum networks. Here we propose a broadband quantum memory scheme called Hole Anti-hole Grating Echo Memory (HAGEM)…
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Reconstruction of Black Hole Islands from Hawking Radiation via the Algebraic Petz Map
arXiv quant-ph
arXiv:2610.10769v1 Announce Type: cross Abstract: The island proposal guarantees a unitary Page curve for evaporating black holes, implying that operators deep behind the horizon must be fully reconstructable from asymptotic Hawking…
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Determinism and Indeterminism as Model Artefacts: Toward a Model-Invariant Ontology of Physics
arXiv quant-ph
arXiv:2512.22540v3 Announce Type: replace-cross Abstract: This paper argues that the traditional opposition between determinism and indeterminism in physics is representational rather than ontological. Deterministic-stochastic dualities…
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Asymptotically Solvable Quantum Circuits
arXiv quant-ph
arXiv:2602.24276v2 Announce Type: replace-cross Abstract: The discovery of chaotic quantum circuits with (partially) solvable dynamics has played a key role in our understanding of non-equilibrium quantum matter and, at the same time, has…
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Tensor Network Representations for Intrinsically Mixed-State Topological Orders
arXiv quant-ph
arXiv:2507.22989v2 Announce Type: replace-cross Abstract: Tensor networks are an efficient platform for representing topological states of matter as well as computing both physical observables and information-theoretic quantities. We…
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Transparent Domain Walls through Information Convex Sets
arXiv quant-ph
arXiv:2609.26892v2 Announce Type: replace Abstract: In $(2+1)$-dimensional topologically ordered many-body states, transparent (topologically deformable) domain walls are invisible to local topological probes, yet can modify the ground…
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Quantum geometry at arbitrary genus - I: Anharmonic potentials
arXiv quant-ph
arXiv:2610.10940v1 Announce Type: cross Abstract: In quantum mechanics of genus-1 potentials, perturbation theory around the topologically trivial saddle and non-perturbative instanton saddle are constructively related via the P/NP…
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An Information-Theoretic Principle for Optimal Quantum Encoding: Tight Frames and Equiangular Ensembles
arXiv quant-ph
arXiv:2607.01564v2 Announce Type: replace Abstract: Optimal encoding of classical data for quantum-assisted statistical inference is investigated from an information-theoretic perspective. We prove that the accuracy of any…
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An Explicit Counterexample to Tsirelson's Problem via a Linear System Game
arXiv quant-ph
arXiv:2610.10248v2 Announce Type: replace Abstract: We construct an explicit binary linear system game that separates $C_{qa}$, the closure of the set of finite dimensional quantum correlations, from $C_{qc}$, the set of commuting operator…
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Improved Local Leakage Resilience of Shamir Secret Sharing and Worst-Case Optimal Polynomial Intersection
arXiv quant-ph
arXiv:2610.12357v1 Announce Type: new Abstract: We study two problems: Local Leakage Resilience (LLR) for Shamir secret sharing, and worst-case Optimal Polynomial Intersection (OPI). Both problems concern polynomials $Q(X)$ of degree less…
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A quasiparticle-protected superconducting qubit
arXiv quant-ph
arXiv:2610.12227v1 Announce Type: new Abstract: Superconducting quantum circuits underpin large-scale quantum processors and are increasingly interfaced with optical systems, yet they are vulnerable to quasiparticle poisoning from…
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Gap Sensitivity and Bottleneck Migration in Sparse Constraint-Preserving Quantum Annealing
arXiv quant-ph
arXiv:2610.11262v1 Announce Type: new Abstract: Constraint-preserving exchange drivers allow many coupling graphs that preserve the same feasible sector, but exhibit different minimum gaps along an annealing path. We derive an…
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Maximal-velocity deficit under a finite-support constraint in a hard-wall half-line continuous-time quantum walk
arXiv quant-ph
arXiv:2609.01970v3 Announce Type: replace Abstract: Continuous-time quantum walks on a lattice spread ballistically and converge to a limiting distribution for the rescaled position. On the hard-wall half line the boundary reflects the…
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Helicity decoupling ultrastrong Rabi splitting from quantum vacuum dressing
arXiv quant-ph
arXiv:2610.10944v1 Announce Type: new Abstract: Polaritons and quantum vacuum dressing are usually regarded as intertwined consequences of ultrastrong light-matter coupling. Here we show that they can be controlled independently through…
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Quantum Simulation of a Hyperbolically Driven Quantum System with Superconducting Circuits
arXiv quant-ph
arXiv:2610.11081v1 Announce Type: new Abstract: Hyperbolic geometry hosts a plethora of exotic quantum phenomena ranging from holographic duality to novel topological phases. However, investigating these effects experimentally remains…
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Non-Absoluteness, Tracking, and Intersubjectivity in Perspectival Interpretations of Quantum Mechanics: A Conceptual and Formal Analysis
arXiv quant-ph
arXiv:2606.01349v3 Announce Type: replace Abstract: This paper offers a conceptual and formal analysis of non-absoluteness in perspectival interpretations of quantum mechanics. Extended Wigner-type experiments reveal a fundamental tension…
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Parameter-Dependent Noise Resilience in the Quantum Approximate Optimization Algorithm
arXiv quant-ph
arXiv:2610.11710v1 Announce Type: new Abstract: The Quantum Approximate Optimization Algorithm (QAOA) is a variational quantum algorithm used for solving combinatorial optimization problems, which is thought to be a promising application…
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Remote nonreciprocal magnon magnon entanglement via the Barnett effect with coherent feedback
arXiv quant-ph
arXiv:2610.11607v1 Announce Type: new Abstract: We propose a scheme for generating and controlling remote nonreciprocal magnon--magnon entanglement in a cavity magnonic system with coherent feedback.The two microwave cavities are driven by…
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Exact criteria for ground-state overlap dominance and dynamical quantum phase transitions
arXiv quant-ph
arXiv:2604.11420v3 Announce Type: replace-cross Abstract: It was recently conjectured and verified for the transverse-field Ising model [Phys. Rev. B 113, 165102 (2026)] that, after a sudden quench within the same equilibrium phase, the…
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Quantum Networking at the Speed of Quantum Computation: Kilohertz Entanglement in a Heterogeneous Quantum System
arXiv quant-ph
arXiv:2610.10705v1 Announce Type: new Abstract: Distributed quantum computing requires rapid, high-fidelity entanglement between qubits in separate processor modules. Photonic links between single-atom qubits provide switchable, long-range…
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Quantum jumps of sound
arXiv quant-ph
arXiv:2610.10714v1 Announce Type: new Abstract: Quantum mechanics predicts that a vibrating object's energy comes in discrete packets, yet no measurement of its position reveals this discreteness. Resolving individual energy levels…
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Nonlinear Feedback in Josephson Circuit Optimization: Application to a Kerr-Reversal JTWPA
arXiv quant-ph
arXiv:2610.10715v1 Announce Type: new Abstract: Optimizing Josephson-based nonlinear microwave devices is computationally demanding because the straightforward approach requires exploring broad circuit parameter spaces through expensive…
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Fast entanglement generation via cavity-mediated nematic tensor dynamics
arXiv quant-ph
arXiv:2610.11018v1 Announce Type: new Abstract: Many-body entanglement in atomic ensembles offers the potential for enhanced sensing devices. Entanglement can be generated by interfacing atoms with a cavity. Traditional methods use…
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Demonstration of subspace-search variational quantum eigensolver using photonic orbital angular momentum qudits
arXiv quant-ph
arXiv:2610.11026v1 Announce Type: new Abstract: Accurate excited state energies are essential for interpreting fluorescence and photochemical processes, yet variational quantum eigensolvers (VQEs) on noisy intermediate-scale quantum (NISQ)…
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Analog quantum simulation of $\phi^4$ field theory with a superconducting transmission line
arXiv quant-ph
arXiv:2610.11071v1 Announce Type: new Abstract: Understanding the dynamics of interacting quantum fields remains a fundamental challenge. We propose a superconducting transmission line for analog quantum simulation of $(1+1)$-dimensional…
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Retromorphic Testing of Quantum Compiler Passes
arXiv quant-ph
arXiv:2610.11195v1 Announce Type: new Abstract: Quantum compilers play a critical role in transforming high-level quantum programs into optimized, hardware-compatible circuits. However, verifying the correctness of compiler passes remains…
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Exact polariton-condensate states via nonlinear Stark coupling
arXiv quant-ph
arXiv:2610.11234v1 Announce Type: new Abstract: We study a hybrid system of coupled cavities, with or without two-level atoms doped inside. By employing a building-block construction facilitated by nonlinear Stark coupling, we identify a…
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Minimal Scenarios Witnessing Genuine Multipartite Nonlocality Possibilistically
arXiv quant-ph
arXiv:2610.11377v1 Announce Type: new Abstract: We study a strong form of genuine multipartite nonlocality (GMNL), where an $n$-partite scenario admits a quantum strategy generating outcomes belonging to a restricted set with certainty…
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A Power-Liouville Hermite Orbit: Common Spectral Quantization of the Singular Sextic Oscillator and Fractional-Power Potentials
arXiv quant-ph
arXiv:2610.11533v1 Announce Type: new Abstract: A singular sextic oscillator in the finite-Hermite biconfluent-Heun hierarchy generates an exact four-member power-Liouville Hermite orbit. Power coordinate transformations with the Liouville…
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Extended Results on Absorbing Boundary Conditions as Limits of Complex Potentials
arXiv quant-ph
arXiv:2610.11865v1 Announce Type: new Abstract: In quantum mechanics, among the proposals for how to compute the probability distribution of detection time and place along a given spatial surface or in a given volume, two leading…
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Unitary-accessible coherence-erasure distance: Exact qubit solution and a tight qutrit bound
arXiv quant-ph
arXiv:2610.11995v1 Announce Type: new Abstract: We introduce the unitary-accessible coherence-erasure distance, which measures the minimum unitary-control cost required to transform a quantum state into an incoherent state without changing…
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On the separability of Bell-diagonal states with absolutely positive partial transposition
arXiv quant-ph
arXiv:2610.12000v1 Announce Type: new Abstract: Absolutely positive partial transpose (APPT) states, which remain PPT under every global unitary, provide a spectral relaxation of absolutely separable states, which remain separable under…
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Exact value and rigidity of the $2\times3$ magic rectangle
arXiv quant-ph
arXiv:2610.12001v1 Announce Type: new Abstract: The $2\times3$ magic rectangle is a nonlocal game in which two players match entries subject to incompatible parity constraints. We prove that its quantum value is $(1+\sqrt{2/3})/2$ and…
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Who can sample forever? Shot noise effects in quantum linear regression
arXiv quant-ph
arXiv:2610.12015v1 Announce Type: new Abstract: Quantum fidelity kernels and quantum extreme learning machines share the same basic architecture: a fixed quantum device generates features that are combined through a classically trained…
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Mutually unbiased bases: common states, completion, and extension obstructions
arXiv quant-ph
arXiv:2610.12180v1 Announce Type: new Abstract: Which pure states give uniform outcomes in several mutually unbiased measurements, and when can they form another measurement basis? We distinguish common unbiased states, their orthonormal…
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Toward Joint Optimization of Circuit Depth and Training Data Size in Adaptively Grown Quantum Classifiers
arXiv quant-ph
arXiv:2610.12428v1 Announce Type: new Abstract: Building a quantum model involves a tradeoff: how complex the circuit should be, and how much training data it needs. Caro et al. show that models with fewer trainable gates need less…
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Spin Chain with Continuous Exponential Symmetry: Topological Phase and Beyond
arXiv quant-ph
arXiv:2610.10682v1 Announce Type: cross Abstract: We study symmetric gapped ground states of one-dimensional spin $S$ chains with a continuous exponential symmetry $U(1)\rtimes\mathbb Z_2$ with integer base $q$, where the U(1) charge has a…
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Millisecond phonon lifetimes in piezoelectric nanomechanical resonators
arXiv quant-ph
arXiv:2610.10700v1 Announce Type: cross Abstract: Piezoelectric nanomechanical resonators operating at gigahertz frequencies are a promising platform for quantum information processing and precision sensing, but phonon lifetimes have been…
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Energy-constrained two-way capacities of the pure-loss channel
arXiv quant-ph
arXiv:2610.12365v1 Announce Type: new Abstract: We determine the two-way quantum and secret-key capacities of the pure-loss channel under an average input photon-number constraint. For transmissivity $\eta$ and photon budget $N$, both…
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Magnonic cavity-enhanced quantum magnetometry with nitrogen-vacancy centre ensembles
arXiv quant-ph
arXiv:2610.11350v1 Announce Type: cross Abstract: Nitrogen-vacancy (NV) centre ensembles are leading room-temperature magnetometers, but their sensitivity is usually extracted from a single resonance and relies on external microwave and…
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Dielectric constant of holographic insulator from quantum geometry
arXiv quant-ph
arXiv:2610.11635v1 Announce Type: cross Abstract: We study dielectric properties of holographic insulators from the quantum geometry of the ground state. We realize the insulating state by the pseudoscalar interaction of holographic…
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Mass quench in interacting finite-size quantum field system
arXiv quant-ph
arXiv:2610.12045v1 Announce Type: cross Abstract: In this work, we theoretically investigate the non-equilibrium evolution of the correlation functions of a quantum scalar field following a mass quantum quench in a finite-size system. The…
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Large-Scale Benchmarking of Quantum Neural Network Configurations for Financial Time Series Forecasting
arXiv quant-ph
arXiv:2610.12148v1 Announce Type: cross Abstract: Quantum machine learning, and quantum neural networks (QNNs) in particular, are advancing fields with growing potential. Although systematic comparisons of QNN configurations have been…
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A Gauge-Invariant Clustering Coefficient for Complex-Weighted Bipartite Networks
arXiv quant-ph
arXiv:2610.11929v1 Announce Type: cross Abstract: Structural measures such as the clustering coefficient and the average shortest-path length characterise how a network is organised. These measures are typically formulated for real…
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Continuous-variable designs and design-based shadow tomography from random lattices
arXiv quant-ph
arXiv:2412.17909v4 Announce Type: replace Abstract: We investigate state designs for continuous-variable quantum systems using the aid of lattice-like quantum states. These are code states of Gottesman-Kitaev-Preskill (GKP) codes. We show…
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Cavity-mediated cross-cross-resonance gate
arXiv quant-ph
arXiv:2506.03239v2 Announce Type: replace Abstract: We propose a cavity-mediated gate between two transmon qubits or other nonlinear superconducting elements. The gate is realized by driving both qubits at a frequency that is near-resonant…
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Does Data Complexity Predict Quantum Advantage? A framework, a pre-specified test, and an attribution of the measured edge
arXiv quant-ph
arXiv:2509.16410v2 Announce Type: replace Abstract: Quantum machine learning (QML) holds promise for pattern recognition, optimization, and data analysis, but the conditions under which it can outperform classical methods remain unclear…
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Burau representation, Squier's form, and non-Abelian anyons
arXiv quant-ph
arXiv:2510.18186v5 Announce Type: replace Abstract: We study a phase-tunable coherent device that reproduces the matrix-valued braid statistics associated with non-Abelian anyons without assuming pre-existing anyonic quasiparticles. The…
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Unconditional and exponentially large violation of classicality
arXiv quant-ph
arXiv:2511.11008v2 Announce Type: replace Abstract: Testing the predictions of quantum mechanics has been one of the main experimental endeavors for decades. Recent advancements in technology led to a number of demonstrations which test…
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Quditto: Emulating and Orchestrating Distributed QKD Network Deployments
arXiv quant-ph
arXiv:2512.15408v2 Announce Type: replace Abstract: Quantum Key Distribution (QKD) offers information-theoretic security by leveraging quantum mechanics, yet the cost and complexity of dedicated hardware and fiber infrastructure have so…
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Tailoring Quantum Chaos With Continuous Quantum Measurements
arXiv quant-ph
arXiv:2602.02663v2 Announce Type: replace Abstract: We investigate the role of quantum monitoring in the dynamical manifestations of Hamiltonian quantum chaos. Specifically, we analyze the generalized spectral form factor, defined as the…
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Merged amplitude encoding for Chebyshev quantum Kolmogorov-Arnold networks
arXiv quant-ph
arXiv:2603.02818v4 Announce Type: replace Abstract: Quantum Kolmogorov--Arnold networks evaluate each edge activation function as a quantum inner product, creating a trade-off between qubit count and the number of circuit executions per…
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Comment on "Quantum theory based on real numbers cannot be experimentally falsified": On the compatibility of physical principles with information theory for fermions
arXiv quant-ph
arXiv:2604.07425v2 Announce Type: replace Abstract: The manuscript [arXiv:2603.19208] proposes a physically motivated postulate to select the appropriate formulation of quantum theory over real Hilbert spaces, ruling out the theory…
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On Constructing and Decoding Quantum Triorthogonal Codes
arXiv quant-ph
arXiv:2605.24519v2 Announce Type: replace Abstract: Triorthogonal codes are a basic ingredient in magic-state distillation, as they enable transversal implementation of logical $\mat{T}$ gates. As a non-Clifford operation, the $\mat{T}$…
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Robustness of Entanglement Manipulation for almost i.i.d. sources
arXiv quant-ph
arXiv:2606.06392v2 Announce Type: replace Abstract: We study the robustness of asymptotic entanglement manipulation for Mazzola--Sutter--Renner (MSR) almost-iid sources, which allow a sublinear number of deviations from tensor-power…
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Complex frequency-dependent quadrature squeezing in semiconductor lasers
arXiv quant-ph
arXiv:2606.26266v2 Announce Type: replace Abstract: We present a comprehensive study of quadrature squeezing in a quantum well laser based on a fully quantum Langevin approach. We compute the frequency-resolved squeezing map of the laser…
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A new class of pure non-Gaussian quantum states
arXiv quant-ph
arXiv:2607.11774v2 Announce Type: replace Abstract: We discuss a new class of pure non-Gaussian quantum states of light characterized by trigonal symmetry on the phase plane. We propose the term ``trigonal states'' for them and show that…
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Moment Optimization in the Navascu\'es-Pironio-Ac\'in Hierarchy
arXiv quant-ph
arXiv:2607.14755v2 Announce Type: replace Abstract: The Navascu\'es-Pironio-Ac\'in (NPA) hierarchy provides a convergent sequence of semidefinite programming (SDP) relaxations for noncommutative polynomial optimisation, ubiquitous in…
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Mentor-Initiated Asymmetric Bidirectional Quantum Teleportation Protocol for Arbitrary Qubit States
arXiv quant-ph
arXiv:2610.01684v2 Announce Type: replace Abstract: In this paper, a mentor-initiated bidirectional asymmetric quantum teleportation protocol is proposed. Unlike existing schemes that restrict the two-qubit state transmitted from Bob to…
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Optimized discrete Wigner representations and non-stabilizerness in qubit systems
arXiv quant-ph
arXiv:2610.10471v2 Announce Type: replace Abstract: The apparent absence of a stabilizer-specific phase-space description for qubit systems is not fundamental, but arises from fixing a state-independent discrete Wigner map. Allowing the…
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Quantum Information as a New Lens for Precision Neutrino Physics
arXiv quant-ph
arXiv:2606.31996v3 Announce Type: replace-cross Abstract: We present a quantum-information-theoretic study of three-flavor neutrino oscillations in long-baseline experiments by mapping flavor states to qubit-like representations and…
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Deterministic generation of large-scale photonic GHZ states utilizing spin echo in a solid-state quantum light source
arXiv quant-ph
arXiv:2610.11445v1 Announce Type: new Abstract: Quantum technologies witness rapid contemporary developments transitioning from abstract scientific ideas and fundamental demonstrations, into systems of sufficient quality and scale…
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An Energetic Constraint for Qubit-Qubit Entanglement
arXiv quant-ph
arXiv:2603.16225v4 Announce Type: replace Abstract: We analyze qubit-qubit entanglement from an energetic perspective and reveal an energetic trade-off between quantum coherence and entanglement. We decompose each qubit internal energy…
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From Majorana to Bloch: two ways to generalize the Bloch sphere representation
arXiv quant-ph
arXiv:2610.11868v1 Announce Type: new Abstract: While the Bloch sphere provides a canonical geometric representation for qubits, its generalization to pure qudit states ($d>2$) is not unique. This representation can be extended following…
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Spatial delocalization of cold oscillators in hollow-core fibers
arXiv quant-ph
arXiv:2610.06209v2 Announce Type: replace-cross Abstract: Trapped particles in hollow-core fibers enable long-range sensing, though advanced control of their in-fiber motion, such as multimodal cooling and squeezing, remains challenging…
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Topological Superradiant Universality Classes in Cavity-Mediated Spin Chains
arXiv quant-ph
arXiv:2610.11495v1 Announce Type: new Abstract: Superradiant phase transitions are fundamental phenomena in light-matter coupled systems. Here, we uncover a novel class of superradiant criticality that is topologically distinct from…
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Photonic Chips for Universal Quantum Computing: Retrospective and Prospective
arXiv quant-ph
arXiv:2610.11321v1 Announce Type: new Abstract: Integrated photonic quantum chips have emerged as a promising platform for realizing fault-tolerant photonic quantum computers. Compared with bulk-optics systems, integrated photonics offer…
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Quantum-Enhanced Inference of Conditional Future Probabilities with Reduced Memory Cost
arXiv quant-ph
arXiv:2610.10756v1 Announce Type: new Abstract: Many potential future events have devastating consequences, from the onset of earthquakes to financial black swan events. Accurate predictions of their probability of occurrence are vital…
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Theory of the CH$_\text{S}^-$ Defect in MoS$_2$ Confirming the Origin of the Quantum Emission
arXiv quant-ph
arXiv:2610.12283v1 Announce Type: new Abstract: Establishing the microscopic origin of localized emission in two-dimensional materials through consistent agreement between experiment and theory remains challenging. Recent STM/STS-STML…
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Secure Quantum Handshakes: Quantum Network Verification Via Simon's Algorithm
arXiv quant-ph
arXiv:2610.12209v1 Announce Type: new Abstract: Quantum networking represents the future of secure communication, enabling fundamentally new capabilities through quantum information exchange. However, these networks require secure…
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The Imaginary Component of the Weak Momentum: Spectral Vanishing and Gauge Invariance
arXiv quant-ph
arXiv:2610.12112v1 Announce Type: new Abstract: We establish a rigorous functional-analytic framework for the imaginary component $p_I$ of the complex weak momentum $p_Q = p_R + ip_I = \frac{\hbar}{i}\nabla\ln\psi$. For every wavefunction…
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Beyond QAOA: A Review of AI and Quantum Computing for Adaptive Combinatorial Optimization
arXiv quant-ph
arXiv:2610.11759v1 Announce Type: new Abstract: Near-term quantum approaches to combinatorial optimization are limited by qubit counts, circuit fidelity, sampling cost, and the difficulty of encoding constraints, while machine learning is…
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When Does Interference Help Learning? Kernel Geometry as a Pre-Experimental Test for Photonic Reservoir Computing
arXiv quant-ph
arXiv:2610.11360v1 Announce Type: new Abstract: Multi-photon interference is the resource most native to photonic quantum machine learning, yet experiments on photonic reservoirs have reported advantages, null results, and train-only…
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2 Fast 2 Surgery: Fast surgery on QLDPC codes with $\tilde{O}(n(k + d))$ space overhead
arXiv quant-ph
arXiv:2610.11079v1 Announce Type: new Abstract: We show that the fast surgery framework of Baspin-Berent-Cohen can be instantiated using at most $\tilde{O}(n(k + d))$ ancilla qubits, improving on the previously achievable $O(n\cdot k \cdot…
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A lower bound on the overhead of surgery on sparse stabiliser codes
arXiv quant-ph
arXiv:2610.11097v1 Announce Type: new Abstract: We show that performing lattice surgery on sparse stabiliser codes with sparse ancillas requires $\tilde{\Omega}(k^2)$ ancillary qubits in the worst case. As a result, for codes with large…
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Quantum Co-Design of Inhomogeneous Many-Body Neutrino Fast Flavor Transformation
arXiv quant-ph
arXiv:2610.12334v1 Announce Type: new Abstract: Dense-neutrino flavor evolution is a quantum many-body problem whose fully correlated treatment becomes rapidly more expensive with increasing particle number and spatial structure. We…
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Quantum Feature Amplification Network (QFAN) as An Autoregressive Quantum Generative Model
arXiv quant-ph
arXiv:2605.16044v5 Announce Type: replace Abstract: Gate-based quantum generative models have been limited to small images, because their quantum resources grow with the size of the data. The Quantum Feature Amplification Network (QFAN)…
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Clifford and Haar scramblers yield equal mean fidelity but unequal fluctuations in black hole-inspired teleportation
arXiv quant-ph
arXiv:2606.19180v3 Announce Type: replace Abstract: Quantum information transfer between entangled black holes has inspired many-body teleportation protocols. We study such a protocol without assuming a gravitational dual and ask whether…
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Susceptibility of qudit-qudit entanglement to quantum noise: insights from the negativity rank
arXiv quant-ph
arXiv:2610.10820v1 Announce Type: new Abstract: One aspect of complexity for quantum many-body systems resides in their ability to exhibit entanglement, uniquely quantum correlations central to quantum computation. To quantitatively…
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A Flash-Based Relativistic Collapse Model for Quantum Fields
arXiv quant-ph
arXiv:2610.10980v1 Announce Type: new Abstract: Spontaneous collapse models provide a possible, testable solution to the quantum measurement problem, but constructing a relativistic version applicable to quantum field theory remains an…
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From Solid-State Spin Defects to Fluorescent Proteins: A Perspective on Quantum Optical Sensing Platforms for Biomedical Applications
arXiv quant-ph
arXiv:2610.11644v1 Announce Type: new Abstract: Quantum optical sensing has evolved from isolated solid state spin defect platforms to increasingly bio-integrated systems designed for biomedical applications. This review presents a…
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Emergent SSH physics and localization in a cavity--atom system beyond the rotating-wave approximation
arXiv quant-ph
arXiv:2610.11897v1 Announce Type: new Abstract: We investigate a cavity--atom system beyond the rotating-wave approximation and recast its dynamics as an effective tight-binding problem in the excitation-number basis. The same…
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Residual-Guided Global-Drive Design in Trapped-Ion Quantum Simulators
arXiv quant-ph
arXiv:2610.12314v1 Announce Type: new Abstract: Trapped-ion quantum simulators are powerful platforms for exploring many-body physics, yet engineering of arbitrary interaction graphs remains a central challenge. To leverage the intrinsic…
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From Effective Temperature to Non-Boltzmann State Selection in Driven-Dissipative Quantum Criticality
arXiv quant-ph
arXiv:2609.25242v2 Announce Type: replace-cross Abstract: Whether a nonequilibrium quantum-critical steady state can be described by an effective temperature remains an open question. We address it in a voltage-biased electronic…
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Combining Error Verification and Privacy Amplification in Quantum Key Distribution
arXiv quant-ph
arXiv:2610.10702v1 Announce Type: new Abstract: Quantum Key Distribution (QKD) protocols typically involve two separate steps of error-verification and privacy amplification. Both steps involve the application of a hash function sampled…
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Experimental Measurement-Device-Independent Quantum Key distribution with Flawed State-Preparation over 300 km
arXiv quant-ph
arXiv:2610.11428v1 Announce Type: new Abstract: Quantum key distribution (QKD) promises theoretically secure communication. However, it encounters challenges in implementation security and performance due to inevitable device…
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High-Rate Concatenated Quantum Error-Correcting Codes for Qudits
arXiv quant-ph
arXiv:2610.11225v1 Announce Type: new Abstract: Qudits provide a larger local Hilbert space than qubits and have recently attracted interest as building blocks for efficient fault-tolerant quantum computation (FTQC). In this work, we…
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Tensors, entanglement, separability, and their complexity
arXiv quant-ph
arXiv:2509.21639v3 Announce Type: replace Abstract: The aim of this paper is to show how to characterize the entanglement and separability of d-partite states, and to obtain both known and new results using the modern theory of tensors…
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Comparing quantum and classical finite state generators
arXiv quant-ph
arXiv:2604.10315v2 Announce Type: replace Abstract: Bell-CHSH-like inequalities have been very successful in benchmarking {\it spatial} quantum correlations. However, as this paper illustrates, they are in general not sufficient for…
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Quantum Cut Sparsifiers
arXiv quant-ph
arXiv:2606.09728v2 Announce Type: replace Abstract: In this paper, we continue a line of research initiated by Basu, Brakensiek, and Putterman [2026] studying the sparsifiability of Hamiltonians. We focus particularly on the…
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Localized Decoherence as a Constructive Tool: An Optical Simulation of Matter-Wave Interference
arXiv quant-ph
arXiv:2609.25227v3 Announce Type: replace Abstract: Decoherence is conventionally regarded as a detrimental process that suppresses quantum coherence and limits the performance of quantum technologies. Contrary to this view, we show that…
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Complexity study of the Hartle-Hawking state in JT gravity
arXiv quant-ph
arXiv:2610.00844v2 Announce Type: replace-cross Abstract: The Wigner function, in general, takes on negative values, and the amount of negativity in the Wigner function gives an operationally meaningful measure of the complexity of…
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Measure Now, Mitigate Later: Virtual Error Cancellation for Logical Quantum Circuits
arXiv quant-ph
arXiv:2610.12400v1 Announce Type: new Abstract: Early fault-tolerant quantum algorithms are a key step in scalable quantum computing, but are ultimately constrained by residual, uncorrectable logical errors. Logical quantum error…
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Magnetic localization and spectral asymmetry of a charged particle at a screw dislocation
arXiv quant-ph
arXiv:2610.10555v1 Announce Type: cross Abstract: We study a charged particle moving outside a spiral (screw) dislocation in a uniform magnetic field. Although the geometry is locally Euclidean, its global screw identification couples the…
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Q-Capsule: A Localized Capsule-Based Quantum Neural Architecture for Barren Plateau Mitigation
arXiv quant-ph
arXiv:2610.11261v1 Announce Type: new Abstract: Variational quantum algorithms are often limited by barren plateaus: gradients vanish as circuit size and depth increase, making quantum neural networks difficult to train. We propose…
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The coupler Eve did not monitor: a black-box cavity cheat
arXiv quant-ph
arXiv:2610.09103v2 Announce Type: replace Abstract: Eve receives two average photon counts, while a monitor watching for external leakage may register nothing. Can she conclude that Alice and Bob's opaque cavity devices did not…
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Entanglement entropy and magic of ZX-diagrams
arXiv quant-ph
arXiv:2610.12447v1 Announce Type: new Abstract: Entanglement and non-stabilizerness are complementary resources underlying the complexity of quantum states, yet extracting either quantity from large quantum circuits generally requires…
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Single-shot magic state factories for quantum LDPC codes
arXiv quant-ph
arXiv:2610.10731v1 Announce Type: new Abstract: Quantum low-density parity-check (qLDPC) codes can substantially reduce the qubit overhead of fault-tolerant quantum computation, but any useful architecture based on such codes also requires…
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Witnessing Quantum Bayesian Inference beyond Classical Learning
arXiv quant-ph
arXiv:2610.09293v2 Announce Type: replace Abstract: Can an agent's predictions reveal whether its reasoning is based on a classical or a quantum model? Using known results on matrix factorizations, here we show that quantum Bayesian…
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Engineering Quantum Interactions: From Effective Models to Validated Physical Predictions
arXiv quant-ph
arXiv:2610.10763v1 Announce Type: new Abstract: Effective models make complex quantum dynamics tractable by retaining only the states, processes, and timescales relevant to a given physical question. Their predictive power, however…
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Coherence-assisted quantum state preparation and thermal control through repeated interactions
arXiv quant-ph
arXiv:2610.10794v1 Announce Type: new Abstract: We investigate the relaxation dynamics and steady state of a qubit interacting with a coherent environment through an energy-conserving flip-flop interaction within the Markovian…
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Uncertainty Quantification for Quantum Fidelity Estimation
arXiv quant-ph
arXiv:2610.10885v1 Announce Type: new Abstract: Quantum fidelity estimation is a fundamental task in quantum information and computing to benchmark the quality of quantum states, and hence of quantum processes, on noisy quantum hardware…
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Local polarization control of optical tweezer arrays
arXiv quant-ph
arXiv:2610.12406v1 Announce Type: cross Abstract: Optical tweezer arrays trapping ultracold atoms and molecules are a versatile quantum science platform with broad impact in quantum simulation, quantum computation, and quantum metrology…
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Scalable Fluxonium-Transmon Architecture for Error Corrected Quantum Processors
arXiv quant-ph
arXiv:2508.09267v2 Announce Type: replace Abstract: We propose a hybrid quantum computing architecture composed of alternating fluxonium and transmon qubits, that are coupled via transmon tunable couplers. We show that this system offers…
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Geometry-optimized hyperbolic codes for modular fault-tolerant quantum architectures
arXiv quant-ph
arXiv:2610.10948v1 Announce Type: new Abstract: Quantum fault tolerance is a prerequisite to harness the full potential of quantum computers. However, achieving fault tolerance remains a major challenge since it requires optimizing…
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Quantum simulation of material-specific Hubbard models with alkaline-earth atoms
arXiv quant-ph
arXiv:2610.10713v1 Announce Type: cross Abstract: A long-term goal of quantum simulation is to faithfully reproduce the low-energy Hamiltonians of correlated quantum materials, establishing a direct connection between solid-state…
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Quantum annealing of the random transverse-field Ising model in one, two, and three dimensions
arXiv quant-ph
arXiv:2610.11411v1 Announce Type: cross Abstract: Quantum annealing must be sufficiently slow to prevent defect formation. We study this problem in the random transverse-field Ising model via the adiabatic theorem to obtain the limiting…
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Many-Body Effects in Dark-State Laser Cooling
arXiv quant-ph
arXiv:2601.09180v2 Announce Type: replace Abstract: We develop a unified many-body theory of two-photon dark-state laser cooling, the workhorse for preparing trapped ions close to their motional quantum ground state. For ions with a…
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Parallelizing the Variational Quantum Eigensolver: From JIT Compilation to Multi-GPU Scaling
arXiv quant-ph
arXiv:2601.09951v2 Announce Type: replace Abstract: The Variational Quantum Eigensolver (VQE) is a hybrid quantum-classical algorithm for ground-state energies of molecular systems. We compute the potential energy surface of the hydrogen…
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Error-Corrected Memory and Logic on a Heavy-Hex Superconducting-Qubit Processor
arXiv quant-ph
arXiv:2610.11658v1 Announce Type: new Abstract: Large quantum computations require high-fidelity error-corrected memory and fault-tolerant logical operations. To achieve these with superconducting circuits, quantum processors will need…
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Quantum Optimization of the Color-of-Money Problem on IBM Quantum Hardware: A Proof-of-Concept Study
arXiv quant-ph
arXiv:2610.09798v2 Announce Type: replace Abstract: The Color-of-Money (CoM) problem is a financial optimization challenge in which enterprises must determine how to allocate and route funds across multiple accounts, currencies, and time…
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Sufficient quantum provenance: retained fields and certified recording precision
arXiv quant-ph
arXiv:2610.09931v2 Announce Type: replace Abstract: Which execution details must a quantum computation retain, and to what precision, to support a declared comparison? We define a sufficient record by the largest Hellinger distance between…