Quantum Computing
Quantum Computing news — Thursday 22 October 2026
134 stories from 3 sources, every one in English. Each links to its publisher.
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Symmatrics Appoints Andrew Hallman to Strategic Advisory Board
The Quantum Insider
Insider Brief Symmatrics has appointed Andrew Hallman, a former senior CIA and ODNI official who now works at Leidos, to its Strategic Advisory Board. Hallman brings more than 30 years of intelligence and security experience, including…
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Qblox Integrates NVIDIA DGX Spark With Quantum System Controller
The Quantum Insider
Insider Brief Qblox has integrated NVIDIA DGX Spark with its quantum system controller using NVIDIA NVQLink, reporting round-trip latency below 4.0 microseconds on NVIDIA RTX PRO 6000 Blackwell and below 7.2 microseconds on DGX Spark. The…
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ZuriQ and Rhonexum Partner on Cryogenic Electronics for Quantum Computing
The Quantum Insider
Insider Brief ZuriQ and Rhonexum have signed a multi-year commercial agreement under which Rhonexum will supply cryogenic integrated-circuit technologies and customization services for <a…
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Ericsson Canada and ÉTS Partner on Quantum Computing Research
The Quantum Insider
Insider Brief Ericsson Canada and École de technologie supérieure (ÉTS) have launched a Mitacs-supported research project to develop quantum computing methods for improving telecom network operations. The research team will investigate…
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Quantum Beach 2026 — Official Livestream
The Quantum Insider
Join us online on October 22 as Quantum Beach 2026 brings researchers, entrepreneurs, investors and industry leaders to the Palm Beach County Convention Center in West Palm Beach, Florida. Explore the ideas, investments and partnerships…
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IBM and Rutgers Control Quantum Chaos Across 100 Qubits on Heron Processor
Quantum Computing Report
IBM and Rutgers researchers have demonstrated real-time quantum feedback control across 100 qubits on an IBM Quantum Heron processor. Their study, published in Nature Physics, implemented adaptive quantum circuits to validate non-unitary…
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qBraid Unveils qBraid OS and Launches Hosted GH200 GPU Simulators at NVIDIA GTC Berlin
Quantum Computing Report
At NVIDIA GTC Berlin, qBraid unveiled qBraid OS, an agentic operating system for managing quantum processing units, and launched two hosted GPU-accelerated quantum simulators on NVIDIA GH200 Grace Hopper Superchips. The qBraid OS…
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SEEQC Combines Chip-Based Processing With NVIDIA AI to Improve Quantum Error Correction
The Quantum Insider
Insider Brief SEEQC reported simulation results showing that combining its chip-based pre-decoder with NVIDIA Ising reduced quantum error-correction decoding time and logical error rates by approximately 50% compared with using Ising…
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UK National Physical Laboratory Secures £230,000 ($307.5K USD) GOTT Grant to Scale Quantum Ion-Trap Manufacturing
Quantum Computing Report
The National Physical Laboratory (NPL) in the UK has received a £230,000 ($307.5K USD) grant from the Government Office for Technology Transfer (GOTT). This funding will be used to accelerate the commercial development and scalable…
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RhymeQ Emerges from Stealth with $2.2 Million Pre-Seed Round to Launch Python Abstraction Layer for Quantum Computing
Quantum Computing Report
Quantum software startup RhymeQ secured $2.2 million in pre-seed funding to develop Rhyme, a high-level quantum programming platform. Rhyme allows developers to program quantum software using Python, abstracting away low-level quantum…
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Palm Beach Colleges Connect as Florida Launches Quantum-Safe Network
The Quantum Insider
Insider Brief Florida’s first statewide quantum-safe network segment is operational, connecting Palm Beach State College and Florida Atlantic University in Boca Raton using IonQ quantum key distribution technology. Supported by a $1…
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UK and Singapore Discuss Quantum Security and Post-Quantum Cryptography
The Quantum Insider
Insider Brief The UK and Singapore held their 11th Financial Dialogue in Singapore, discussing cooperation in digital finance, AI, quantum technologies, capital markets and sustainable finance. On quantum technologies, both countries…
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Black Kite Adds Quantum Readiness Checks for Third-Party Vendors
The Quantum Insider
Insider Brief Black Kite has introduced Quantum Readiness controls within its Cyber Rating platform to assess observable signs of post-quantum cryptography readiness across an organization’s third-party vendors. The new controls examine…
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Sparrow Quantum Appoints Founder Peter Lodahl as CEO
The Quantum Insider
Insider Brief Sparrow Quantum has appointed founder Peter Lodahl as CEO, succeeding Kurt Stokbro, who will remain involved as an executive advisor and board member. The company plans to focus on integrating, controlling and connecting its…
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Transition between weak and strong measurements in the presence of post-selection
arXiv quant-ph
arXiv:2609.04812v2 Announce Type: replace Abstract: In the weak measurement regime, post-selection can result in the observation of anomalous weak values, seemingly contradicting the eigenvalue statistics observed when the measurement…
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Adaptive Entangled Neurons in the Brain and Natural Intelligence Simulations for Artificial General Intelligence
arXiv quant-ph
arXiv:2609.09226v2 Announce Type: replace-cross Abstract: Understanding the brain's mechanisms is crucial in neuroscience, particularly for simulating natural intelligence and advancing artificial general intelligence (AGI). Liu et al…
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Short qudit triorthogonal codes from doubling
arXiv quant-ph
arXiv:2610.29457v1 Announce Type: new Abstract: We construct short triorthogonal codes for qudits of odd prime dimension by generalizing doubling, which combines a triorthogonal code with a code admitting a transversal phase gate, and…
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Low-field dephasing time of an optically polarized NV$^-$ spin bath beyond the P1 limit in diamond: a cluster-correlation-expansion and exact spin-bath study
arXiv quant-ph
arXiv:2610.29279v1 Announce Type: new Abstract: Dense ensembles of nitrogen-vacancy (NV$^-$) centres in nitrogen-rich diamond dephase on the electron spins of the substitutional nitrogen (P1) centres. If the paramagnetic nitrogen is…
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Boundary exceptional point driven chiral switch of topological edge states
arXiv quant-ph
arXiv:2610.29316v1 Announce Type: new Abstract: We theoretically investigate the interplay of topology and localized non-Hermiticity in a finite Su-Schrieffer-Heeger chain characterized by non-Hermitian potentials at its boundaries. By…
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Geometry-controlled zeros of resonant Kelvin-wave conversion in four spatial dimensions
arXiv quant-ph
arXiv:2610.29218v1 Announce Type: cross Abstract: Kelvin waves carry energy along vortices, but their resonant interactions contain information that is absent from the linear spectrum. We identify a geometry that exposes this information…
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Classification of bipartite observables III: simplicity, mixtures and quantum error correction
arXiv quant-ph
arXiv:2610.22205v2 Announce Type: replace-cross Abstract: This is the third of a series of three papers that bring model theory to quantum information. The dividing lines of Shelah's classification theory, which separate the tame…
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Semiclassical molecular dynamics simulations of electromagnetically induced transparency cooling of 2D and 3D ion crystals in a Penning trap
arXiv quant-ph
arXiv:2610.29718v1 Announce Type: new Abstract: Motional modes of trapped-ion crystals in Penning traps can now be cooled to near their ground states via electromagnetically induced transparency (EIT) cooling. Numerical simulations are…
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Superconducting parametric amplifiers based on arrays of unequal Josephson junction elements
arXiv quant-ph
arXiv:2610.29901v1 Announce Type: new Abstract: Impedance matching is a crucial feature of an amplifier used to increase its instantaneous bandwidth and is typically achieved using static LC resonators. Here we show an approach to…
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Fast Template Matching for Quantum Circuits Using Hypergraph
arXiv quant-ph
arXiv:2610.29095v1 Announce Type: new Abstract: Quantum circuit optimization is a key step toward the efficient execution of quantum algorithms. Template matching has emerged as one of the dominant approaches for simplifying quantum…
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Readout Dependent Parameter Identifiability of Quantum Kernels
arXiv quant-ph
arXiv:2610.29186v1 Announce Type: new Abstract: A circuit parameter can change measured features without changing their projected Gaussian kernel. We characterize this lost dependence and distinguish recovery by metric design from…
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Inaccessibility of the Cosmological Singularity to Quantum Probes
arXiv quant-ph
arXiv:2610.30071v1 Announce Type: cross Abstract: We propose an operational resolution of the FLRW big bang singularity using quantum probes satisfying a curvature coupled Klein-Gordon equation. Applying the Madelung-Bohm decomposition of…
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Highly integrated quantum key distribution transmitter enabled by silicon photonics
arXiv quant-ph
arXiv:2607.23413v2 Announce Type: replace Abstract: Quantum key distribution (QKD) provides information-theoretic security independent of computational assumptions, yet the bulk and cost of current systems hinder large-scale deployment…
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Local Clifford equivalence to CSS codes: Polynomial-time classification and conversion
arXiv quant-ph
arXiv:2610.28737v1 Announce Type: new Abstract: Calderbank--Shor--Steane (CSS) codes support decoding and fault-tolerant logical operations through separate pure $X$ and pure $Z$ stabilizer checks. Generator choices and single-qubit…
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Edge universality in Floquet sideband spectra
arXiv quant-ph
arXiv:2604.05244v2 Announce Type: replace-cross Abstract: A monochromatic voltage drive redistributes noninteracting fermions over sidebands with Bessel amplitudes. A sharp Fermi step gives the discrete Bessel source kernel, whose large…
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Quantum mechanical Gaussian wavepackets of single relativistic particles
arXiv quant-ph
arXiv:2309.09429v3 Announce Type: replace Abstract: We study the evolutions of selected quasi-(1+1) dimensional wavepacket solutions to the Klein-Gordon equation for a relativistic charged particle in uniform motion or accelerated by a…
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Resource Analysis of Quantum Optimization Algorithms via Variational Methods
arXiv quant-ph
arXiv:2610.29919v1 Announce Type: new Abstract: Variational Quantum Algorithms (VQAs) are promising approaches for solving combinatorial optimization problems on near-term quantum devices. However, the role played by quantum resources such…
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Finite Classification of Transversal Diagonal Gates Beyond Stabilizer Codes
arXiv quant-ph
arXiv:2610.29955v1 Announce Type: new Abstract: We establish that transversal diagonal gates on exact qubit codes of distance at least two can be exhaustively classified within a finite search space. Although code-preserving physical gates…
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The L\'{e}vy wave packet and fractional uncertainty relations
arXiv quant-ph
arXiv:2610.29397v1 Announce Type: cross Abstract: This work revisits the debate on fractional uncertainty relations that arose a decade ago and tries to settle it. After a careful study of the position-momentum uncertainty product of the…
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A constructive solution to the $n$-representability problem
arXiv quant-ph
arXiv:2610.20737v2 Announce Type: replace Abstract: We present an instantiation of the constructive solution to the fermionic quantum marginal problem by building the complete family of two-body witnesses at each level of a weighted…
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Splitting Probability in Monitored Quantum Dynamics
arXiv quant-ph
arXiv:2610.29547v1 Announce Type: cross Abstract: We consider a continuous-time quantum walk stroboscopically subjected to projective measurements on two distinct targets with sampling time period $\tau$. We construct a general renewal…
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Tight Bounds on the Randomized Communication Complexity of Vector-in-Subspace
arXiv quant-ph
arXiv:2610.30052v1 Announce Type: cross Abstract: We prove that the randomized communication complexity of Vector-in-Subspace in $\mathbb R^n$ with error at most $1/3$ is $\Theta(\sqrt n)$. Alice holds a unit vector $u$ and Bob holds an…
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Phonon-assisted free-electron recoil control and mechanical sensing
arXiv quant-ph
arXiv:2610.30124v1 Announce Type: cross Abstract: Mechanical vibrations are fundamental to a wide range of physical phenomena and technologies, yet their ability to actively shape free-electron dynamics remains largely unexplored. Here we…
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Mutual transformations of arbitrary ternary qubit trees by Clifford gates
arXiv quant-ph
arXiv:2404.16693v3 Announce Type: replace Abstract: It is shown that ternary qubit trees with the same number of nodes can be transformed by the naturally defined sequence of Clifford gates into each other or into standard representation…
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Macroscopic quantum coherence and entanglement in mechanical systems
arXiv quant-ph
arXiv:2503.08324v2 Announce Type: replace Abstract: The notion of a macroscopic quantum state must be pinned down in order to assess how well experiments probe the large-scale limits of quantum mechanics. However, the issue of quantifying…
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Optimal phase estimation in the presence of correlated dephasing
arXiv quant-ph
arXiv:2511.07211v2 Announce Type: replace Abstract: We investigate optimal metrological protocols for phase estimation in the presence of correlated dephasing noise, including spin-squeezed state sensing strategies as well as parallel and…
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Universal Statistics of Measurement-Induced Entanglement in Tomonaga-Luttinger liquids
arXiv quant-ph
arXiv:2512.13809v3 Announce Type: replace Abstract: We study the statistics of measurement-induced entanglement (MIE) after partial measurement on a class of one-dimensional quantum critical states described by Tomonaga-Luttinger liquids…
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Evolutionary BP+OSD Decoding for Low-Latency Quantum Error Correction
arXiv quant-ph
arXiv:2512.18273v3 Announce Type: replace Abstract: Quantum error correction (QEC) for fault-tolerant quantum computing requires a balanced decoding solution that offers high performance, low complexity, and low latency. However, the de…
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Quantum Charge as a Particle/Antiparticle Label
arXiv quant-ph
arXiv:2610.29791v1 Announce Type: cross Abstract: We show that the concept of particles and antiparticles is related to the Weyl-Heisenberg group $W\!H_3$. Its generators are the position operators $\hat x^a$, the momentum operators $\hat…
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Measurement of quantum states and nonlocal correlations
arXiv quant-ph
arXiv:2605.21243v5 Announce Type: replace Abstract: One of the major remaining questions concerning foundations of the quantum mechanical theory is how superpositions are measured such that definite outcomes are obtained. Here a resolution…
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Exact minimum measurement dependence for faithful local deterministic models of multipartite GHZ-Mermin correlations
arXiv quant-ph
arXiv:2608.00124v3 Announce Type: replace Abstract: A local deterministic model can reproduce Bell-inequality violations only if the hidden state depends on the measurement settings. Hall found the minimum such dependence for the singlet…
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Exact quantum circuits for a lattice Boltzmann realization of the Dirac equation
arXiv quant-ph
arXiv:2608.06570v2 Announce Type: replace Abstract: The quantum lattice Boltzmann scheme of Succi and Dellar advances a four-component Dirac spinor on a lattice by a fixed sequence of local, exactly norm-preserving operations: a basis…
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Observation of Universal Quantum Chaos at Shallow Depths
arXiv quant-ph
arXiv:2609.28623v2 Announce Type: replace Abstract: Universal statistical laws are a hallmark of quantum chaos. A natural route to probing them in quantum circuits is offered by the statistics of output probabilities, which for…
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Hidden parabolic subgroups of $\mathrm{GL}_n$ over finite chain rings
arXiv quant-ph
arXiv:2610.28368v2 Announce Type: replace 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…
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Correlation of divergency: c_delta. Being different in a similar way or not
arXiv quant-ph
arXiv:2510.16717v3 Announce Type: replace-cross Abstract: Matched sets may have unlike mean scores and spreads yet share the same way in which some scores stand apart. Mean gaps and raw-score correlations do not answer this question…
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Electronic crystals and quasicrystals in semiconductor quantum wells: an AI-powered discovery
arXiv quant-ph
arXiv:2512.10909v2 Announce Type: replace-cross Abstract: The homogeneous electron gas is a cornerstone of quantum condensed matter physics, providing the foundation for developing density functional theory and understanding electronic…
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Evaluation of the quantum Fisher information for large systems via an ancilla
arXiv quant-ph
arXiv:2610.29146v1 Announce Type: new Abstract: Quantum Fisher information (QFI) is a fundamental quantity in quantum information and quantum mechanics, and evaluating it in various physical systems has become an important research topic…
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Microscopic study of topological phase transitions: Percolation point of view
arXiv quant-ph
arXiv:2607.26707v3 Announce Type: replace Abstract: We investigate microscopic mechanisms underlying decoherence-induced transitions between topologically ordered states. As a first case study, we analyze the color code using topological…
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Long-horizon autoformalization of a core theorem underlying MIP* = RE
arXiv quant-ph
arXiv:2609.19814v3 Announce Type: replace Abstract: Landmark mathematical formalizations have taken specialist teams years to complete. We present FormalFlow, a system that coordinates AI proving agents under human supervision to address…
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Comment on "InAs-Al hybrid devices passing the topological gap protocol", Microsoft Quantum, Phys. Rev. B 107, 245423 (2023)
arXiv quant-ph
arXiv:2502.19560v2 Announce Type: replace-cross Abstract: The topological gap protocol (TGP) is presented as "a series of stringent experimental tests" for the presence of topological superconductivity and associated Majorana zero modes…
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High Fidelity Single-NV Qubit Quantum State Tomography by Photoelectric Readout
arXiv quant-ph
arXiv:2603.16502v2 Announce Type: replace Abstract: The nitrogen-vacancy (NV) center in diamond is one of the advanced candidates for solid-state quantum computing at room temperature and has proven to be competitive in terms of gate…
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Pushing beyond the memory barrier in propagation algorithms with randomization
arXiv quant-ph
arXiv:2610.28845v1 Announce Type: new Abstract: Performant classical tools for simulating quantum circuits are important for benchmarking and supporting upcoming quantum devices. Pauli propagation offers promising capabilities, but deep…
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Tunable flat bands from a parent chiral Hamiltonian
arXiv quant-ph
arXiv:2610.28848v1 Announce Type: new Abstract: Systems with flat bands are interesting as they potentially host many exotic quantum phenomena that would be hard to observe in usual systems with dispersive bands. Multiple approaches were…
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Turning Quantum Compiler Configuration Selection Upside Down: A Top-Down Paradigm
arXiv quant-ph
arXiv:2610.29170v1 Announce Type: new Abstract: Selecting an effective quantum compiler configuration requires coordinated decisions over both hardware targets and compiler settings, with the ultimate goal of improving circuit execution…
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Bias-Preserving Entanglement of Kerr-Cat Qubits with an ATS Coupler
arXiv quant-ph
arXiv:2610.28749v1 Announce Type: new Abstract: Kerr-cat qubits offer a hardware-efficient route to fault-tolerant quantum computing by suppressing bit-flip errors exponentially, while phase-flip errors increase only linearly with the mean…
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Optimization versus fair sampling in quantum annealing: An exactly characterized frustrated Ising benchmark
arXiv quant-ph
arXiv:2610.29035v1 Announce Type: new Abstract: Reaching a degenerate ground-state manifold and sampling it uniformly are distinct properties of a quantum annealer. We quantify this distinction using an Ising ring with additional couplings…
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From Qubit Tensorization to Gaussian Optimizers in Bosonic Systems
arXiv quant-ph
arXiv:2610.28902v1 Announce Type: new Abstract: We develop a method for deriving Gaussian optimality results for bosonic quantum systems from inequalities for qubit systems. Inspired by Gross's derivation of the Gaussian logarithmic…
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Digital Quantum Simulation of Dynamics in Interacting Fields
arXiv quant-ph
arXiv:2610.28993v1 Announce Type: new Abstract: Matter under extreme conditions behaves as a non-equilibrium, strongly-interacting quantum system. Such systems are in the non-perturbative regime of quantum chromodynamics (QCD), where their…
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Quantum-Enhanced Matterwave Interferometry in a Ring Waveguide
arXiv quant-ph
arXiv:2610.29562v1 Announce Type: new Abstract: We propose a quantum-enhanced matter-wave interferometry protocol based on fractional-revival dynamics of a Bose-Einstein condensate in a ring, combined with a controlled interaction quench…
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Conservation in Every Quantum Measurement Outcome?
arXiv quant-ph
arXiv:2610.29804v1 Announce Type: new Abstract: In quantum mechanics, conservation laws are usually understood only statistically and only in the context of unitary evolution: during such evolution, if an observable commutes with the…
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Encoding a bosonic mode into qubits for simulating boson-matter interactions
arXiv quant-ph
arXiv:2610.29762v1 Announce Type: new Abstract: We explore the space-time cost of encoding of a bosonic mode into a set of qubits via various encodings, and their resilience to noise. In particular, we compare the performance of the unary…
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Engineering Low-Latency, High-Throughput Quantum Decoders on NVIDIA GPUs
arXiv quant-ph
arXiv:2610.28867v1 Announce Type: cross Abstract: We design and optimize a quantum error correction (QEC) decoder for NVIDIA GPUs, combining Relay belief propagation, a state-of-the-art message-passing algorithm, with order-zero ordered…
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Lieb-Robinson bounds via the Combes-Thomas estimate
arXiv quant-ph
arXiv:2610.28927v1 Announce Type: cross Abstract: This paper studies quantum spin systems: networks of spins coupled by local interactions. The Lieb-Robinson bound predicts that in these systems, information propagates at an essentially…
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Lamb shift of rotational energy levels in quantum gravity
arXiv quant-ph
arXiv:2610.28754v1 Announce Type: cross Abstract: One of the major challenges of modern foundational physics is the combination of quantum physics and general relativity into a theory of quantum gravity. A severe obstacle are the required…
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Methods for Deriving Nonlinear Kinetic Equations from the Dynamics of Quantum Systems
arXiv quant-ph
arXiv:2610.28846v1 Announce Type: cross Abstract: The article outlines key topics related to deriving kinetic equations and, in general, to the relationship between the evolution equations governing quantum many-particle systems. The main…
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Entanglement Dimensionality of Continuous Variable States From Phase-Space Quasi-Probabilities
arXiv quant-ph
arXiv:2509.02743v2 Announce Type: replace Abstract: The dimensionality of entanglement, quantified by the Schmidt number, is a core resource for quantum information processing. While its certification is well-established in…
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A parity obstruction to degree-optimal syndrome extraction in bivariate bicycle codes
arXiv quant-ph
arXiv:2509.26494v4 Announce Type: replace Abstract: Syndrome extraction for a CSS code has depth at least the Tanner-graph degree $\Delta$, attained by edge colouring if gate order is ignored; correctness adds a parity constraint. We prove…
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Generalized Fidelity, the Data Processing Inequality, and Convexity
arXiv quant-ph
arXiv:2609.09753v3 Announce Type: replace Abstract: In this paper, we show that the generalized Bures--Wasserstein distance induced by the generalized fidelity fails the data processing inequality (DPI) in every dimension $n\geq2$. In…
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Energetic Costs of Subspace Quantum Error Correction
arXiv quant-ph
arXiv:2609.03825v2 Announce Type: replace Abstract: Quantum error correction acts as an entropy pump, transferring noise-induced uncertainty from a protected quantum system into syndrome information stored in an auxiliary memory. Repeated…
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Fast Evaluation of the Sixth-Order Time-Convolutionless (TCL6) Master-Equation Generator
arXiv quant-ph
arXiv:2609.18806v2 Announce Type: replace Abstract: Higher-order time-convolutionless (TCL) master equations provide systematic corrections for non-Markovian dynamics in open quantum systems, but their time-ordered integrals become…
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Gap-Priced $|T\rangle$-States: Dynamic $|T\rangle$ Post-Selection and Budget-Aware Factory Provisioning
arXiv quant-ph
arXiv:2610.19299v2 Announce Type: replace Abstract: Magic $|T\rangle$-state preparation dominates the cost of fault-tolerant quantum computation on surface codes, yet cultivation and distillation are typically provisioned statically…
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Decoupling ultrastrong Rabi splitting from quantum vacuum dressing in a chiral cavity
arXiv quant-ph
arXiv:2610.10944v2 Announce Type: replace Abstract: Polariton formation and quantum vacuum dressing are usually regarded as intertwined consequences of ultrastrong light--matter coupling. Here we show that they can be selectively…
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Classification of bipartite observables II: NIP observables and the Todorcevic trichotomy
arXiv quant-ph
arXiv:2610.12908v4 Announce Type: replace Abstract: This is the second of a series of three papers that bring model theory to quantum information. The dividing lines of Shelah's classification theory, which separate the tame first-order…
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Accurate Wichmann-Kroll vacuum polarization calculations with Gaussian basis set
arXiv quant-ph
arXiv:2610.29603v1 Announce Type: cross Abstract: We apply a large Gaussian basis set of size up to $N = 500$ to calculate the all-order Wichmann-Kroll vacuum polarization correction in highly-charged ion. For a hydrogen-like system, this…
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Pure dephasing destroys two-photon amplitude, not nonlinear phase
arXiv quant-ph
arXiv:2610.30098v1 Announce Type: new Abstract: A two-level emitter chirally coupled to a waveguide imprints a $\pi$ conditional phase on a two-photon pulse, a key component assumed in quantum photonic neural network architectures, but…
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Algebraic criteria for complete relaxation in autonomous and periodically driven open quantum systems
arXiv quant-ph
arXiv:2610.29084v1 Announce Type: cross Abstract: We derive sufficient criteria that guarantee convergence of open quantum system dynamics to a unique long-time state independent of the initial conditions. We refer to this behavior as…
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Mamba Quantum Eigensolver (MQE): A Selective State Space Model for Scalable Ground State Simulations in Quantum Chemistry
arXiv quant-ph
arXiv:2610.29779v1 Announce Type: cross Abstract: Predicting molecular electronic structure using Quantum Computing approaches is a challenge in Computational Chemistry. Traditional Variational Quantum Eigensolvers (VQEs) are typically…
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Injection is all you need: parallel universal logic in high-rate concatenated self-dual codes
arXiv quant-ph
arXiv:2610.30087v1 Announce Type: new Abstract: We propose a quantum architecture that achieves addressable and parallel universal fault-tolerant logical in high-rate codes. The codes are obtained from the flexible concatenation of…
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A compact ultracold strontium experiment
arXiv quant-ph
arXiv:2610.29540v1 Announce Type: cross Abstract: We describe a compact and simplified experimental setup for the production of ultracold strontium atoms. Thanks to its low-power oven and coil-free Zeeman slower design, the vacuum system…
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Adapted Fr\"ohlich-Pizzo Model for Horizon-Induced Decoherence
arXiv quant-ph
arXiv:2610.29363v1 Announce Type: new Abstract: The Fr\"ohlich-Pizzo (FP) model is a quantum-mechanical model originally developed to describe the interaction between an atom and the electromagnetic field in the nonrelativistic limit…
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Quantum Simulation of Non-Markovian Open Quantum Systems via Low-Rank Kernel Compression and Coupling Dilution
arXiv quant-ph
arXiv:2610.29372v1 Announce Type: new Abstract: We present an error-controlled framework for the quantum simulation of non-Markovian open-system dynamics in Gaussian environments. For a system coupled linearly to a Gaussian environment…
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Convergence Analysis of the Quantum Blahut-Arimoto Algorithm and the Contraction Coefficient of Qubit Amplitude-Damping Channels
arXiv quant-ph
arXiv:2610.29373v1 Announce Type: new Abstract: In this work, we investigate the convergence rate of the quantum Blahut-Arimoto (BA) algorithm proposed for computing the coherent information of less noisy quantum channels. Previous work…
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Bounds on Attainable Rate Modulation in Fermi's Golden Rule
arXiv quant-ph
arXiv:2610.29404v1 Announce Type: new Abstract: Controlling transition rates is a central objective across quantum optics, condensed-matter physics, and chemical physics, encompassing processes such as spontaneous emission, energy and…
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From Traveling Waves to Synthetic Gauge Fields: A Field-Free Route to Superconducting Diode Effect
arXiv quant-ph
arXiv:2610.29865v1 Announce Type: cross Abstract: The superconducting diode effect requires the forward and reverse bias currents to differ, a scenario achieved via inversion and time-reversal symmetries broken together. The latter, and…
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Quantum Belief Characterization: A Multi-Shot Notion of Equivalence
arXiv quant-ph
arXiv:2610.29450v1 Announce Type: new Abstract: A recent formulation of quantum belief showed that quantum retrodiction depends not only on the reduced density operator of the system of interest, but also on correlations with a hidden…
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Local distinguishability of five quadripartite orthogonal product states
arXiv quant-ph
arXiv:2610.29622v1 Announce Type: new Abstract: The local distinguishability of five bipartite and tripartite orthogonal product states (OPSs) has been effectively resolved, while that of five quadripartite OPSs has not yet been…
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Quantum f-divergences from retrodiction: a unifying classical variational principle
arXiv quant-ph
arXiv:2610.29696v1 Announce Type: new Abstract: The same classical f-divergence admits inequivalent extensions to quantum states. The question is whether these extensions can be obtained from a common operational variational principle…
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International atomic clock comparison achieving $5\times 10^{-18}$ uncertainty
arXiv quant-ph
arXiv:2610.29980v1 Announce Type: cross Abstract: Two single-ion optical clocks, located in the United Kingdom and in Germany, are compared remotely via a 2220\,km long optical fiber link. Both clocks are based on the ${}^2S_{1/2}…
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High-fidelity and robust controlled-Z gates for superconducting transmon qubits. I. Intrinsic errors and decoherence
arXiv quant-ph
arXiv:2610.30056v1 Announce Type: new Abstract: Fault-tolerant quantum computing requires quantum gates that combine short duration, high fidelity, and robustness to noise. As quantum processors scale, robustness becomes increasingly…
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Spectral signatures of hidden order and hidden quantum critical points
arXiv quant-ph
arXiv:2610.27060v1 Announce Type: cross Abstract: Hidden-order phases elude the conventional Ginzburg-Landau framework: although they spontaneously break symmetry, their order remains invisible to standard local two-point correlators…
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Benchmarking the Quantum Leap: Auditing LLM Evaluation for Quantum Code Generation
arXiv quant-ph
arXiv:2610.28678v1 Announce Type: cross Abstract: Large language models (LLMs) can generate quantum programs, but reliable evaluation remains difficult because benchmarks differ in task composition, scoring, and failure handling. We…
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Single-step phase-engineered pulse for active readout cavity reset with a known qubit state
arXiv quant-ph
arXiv:2512.08393v3 Announce Type: replace Abstract: In a circuit QED architecture, we experimentally demonstrate a hardware-efficient and qubit-state-dependent Single-Step Phase-Engineered (SSPE) pulse scheme for actively depopulating a…
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Depth dependence of entanglement and circuit complexity in random linear optical networks
arXiv quant-ph
arXiv:2604.14277v2 Announce Type: replace Abstract: We study the growth of entanglement and circuit complexity in random passive linear optical networks as a function of the circuit depth. For entanglement dynamics, we start with an…
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Leveraging verifiable structure in quantum circuits to find more efficient compilations with agentic AI
arXiv quant-ph
arXiv:2610.23832v2 Announce Type: replace Abstract: We discuss an effective paradigm of utilizing AI agents to better compile quantum circuits when one can constrain bottleneck subroutines to have some form of classically verifiable…
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Discrete semiclassical theory of quantum-thermal escape
arXiv quant-ph
arXiv:2609.21625v2 Announce Type: replace Abstract: The dissipationless quantum-thermal escape rate from a metastable well is often written as a Boltzmann average of the Hill-Wheeler flux over a continuum of energies. This continuum…
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Finite-time quantum equilibration from local correlations
arXiv quant-ph
arXiv:2610.16351v2 Announce Type: replace Abstract: An isolated quantum system evolves reversibly, yet a small subsystem can lose nearly all information about its initial state. Conserved quantities may retain some of this information…
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Photon Correlations Control Quantum Fisher Information in Coherent Multidimensional Spectroscopy
arXiv quant-ph
arXiv:2610.29422v1 Announce Type: new Abstract: Coherent multidimensional spectroscopy probes interactions and dynamics of molecular systems through nonlinear optical signals. Quantum light excitation has been explored as a means of…
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Constructing and characterising anharmonic potentials in a harmonic oscillator
arXiv quant-ph
arXiv:2609.02405v2 Announce Type: replace Abstract: Continuous-variable quantum systems offer a natural platform for quantum information processing and analogue quantum simulation of real-world processes. Realising these applications…
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Teaching quantum mechanics in secondary schools: A qubit-first learning path to Bell's inequalities
arXiv quant-ph
arXiv:2610.29834v1 Announce Type: cross Abstract: Teaching quantum mechanics at the secondary school level remains a major educational challenge. Traditional historical approaches often present the theory as a sequence of disconnected…
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Classification of Kirkwood-Dirac positivity-preserving unitaries
arXiv quant-ph
arXiv:2502.11784v4 Announce Type: replace Abstract: Kirkwood-Dirac (KD) quasiprobability distributions are increasingly used across quantum information science, yet their computational significance remains unclear. We classify unitary…
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Demonstration of tripartite cat states in two distinct classes of entanglement
arXiv quant-ph
arXiv:2607.12317v2 Announce Type: replace Abstract: Entanglement is a cornerstone of quantum mechanics and an essential resource for quantum computation, communication, and metrology. While bipartite entanglement is extensively studied…
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The Quantum Channels of the Compton Scattering of an Entangled Pair of Photons
arXiv quant-ph
arXiv:2504.04077v2 Announce Type: replace Abstract: The Compton scattering of an entangled pair of photons is studied. Using the resulting reduced density matrix, we demonstrate how to derive the Kraus operators for the interaction from…
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Spin - resolved momentum distributions and vortex evolution in multiphoton pair production within a modified two-level model
arXiv quant-ph
arXiv:2610.29334v1 Announce Type: cross Abstract: We investigate spin-resolved momentum distributions and phase vortices in multiphoton electron-positron pair production within a modified two-level model. This model retains the diagonal…
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Alignment of the amplitudes of stored states for solving the associative memory problem using quantum annealing
arXiv quant-ph
arXiv:2610.29190v1 Announce Type: new Abstract: The solution of combinatorial optimization problems by means of quantum annealing is based on the preparation of an equally superposition state. Such superposition is crucial to the…
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CoDecoder: Make Quantum Decoders Up to 100x Faster and Even More Accurate
arXiv quant-ph
arXiv:2610.28748v1 Announce Type: new Abstract: Fault-tolerant quantum computers need fast and accurate error decoding. We present CoDecoder, a small neural frontend that composes with an existing decoder to improve accuracy and reduce…
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The Prevalence of Straight Shots in Control Space for Reaching Optimal Quantum Performance
arXiv quant-ph
arXiv:2610.28852v1 Announce Type: new Abstract: Gradient-based algorithms are often applied to identify an optimal control for maximizing a quantum objective functional by following a steepest ascent path to the top of the control…
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Spin Kerr-cat qubits
arXiv quant-ph
arXiv:2604.19687v2 Announce Type: replace Abstract: The use of noise-robust qubit encodings provides a way of extending the lifetime of quantum information at the hardware level. In this work, we introduce the spin Kerr-cat encoding, which…
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Interacting quantum reference frames
arXiv quant-ph
arXiv:2610.28732v1 Announce Type: new Abstract: We formulate quantum reference frames within the Dirac quantization of gauge theories, where physical states are obtained from a kinematical Hilbert space $\mathcal{H}_{\rm kin}$ by group…
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Learning Hamiltonians for $O(1)$ Oracle-Query Quantum State Preparation
arXiv quant-ph
arXiv:2512.19181v2 Announce Type: replace Abstract: We propose a Hamiltonian-based quantum state preparation method implemented via a shallow parametrized quantum circuit. The approach learns the parameters of a diagonal Hamiltonian…
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Separability does not certify zero-noise extrapolation: Factorial diagnostics in dynamic quantum circuits
arXiv quant-ph
arXiv:2610.28705v1 Announce Type: new Abstract: Separately amplifying gate, latency, and mid-circuit measurement errors can simplify zero-noise extrapolation, but a weak interaction between amplification knobs does not establish an…
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PQ-Vault: Provably Quantum-Safe Asset Custody for Unmodified Ethereum
arXiv quant-ph
arXiv:2610.29230v1 Announce Type: new Abstract: A quantum computer could recover the key of any Ethereum account whose public key appears on chain. We prove that no sidechain or bridge that leaves Ethereum's rules unchanged can protect…
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Variational quantum-neural hybrid imaginary time evolution
arXiv quant-ph
arXiv:2503.22570v3 Announce Type: replace Abstract: Numerous methodologies have been proposed to implement imaginary-time evolution (ITE) on quantum computers. Among these, variational ITE (VITE) methods for noisy intermediate-scale…
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Second quantization and compactness of induced Gaussian quantum Markov semigroups
arXiv quant-ph
arXiv:2610.13358v2 Announce Type: replace-cross Abstract: We characterize compactness of the Hilbert-Schmidt semigroups induced by finite-mode Gaussian quantum Markov semigroups with a faithful normal invariant state. A unitary…
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An entanglement band structure for general multiqubit states
arXiv quant-ph
arXiv:2610.30040v1 Announce Type: new Abstract: Majorana drew a symmetric multiqubit state as points on the Bloch sphere, antipodal to the zeros of its overlap with spin coherent states. Projecting only one qubit of a general state leaves…
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Spectral Analysis Beyond the Spectral Gap: Rapid Mixing of Quantum Gibbs Samplers in One Dimension
arXiv quant-ph
arXiv:2610.05848v2 Announce Type: replace Abstract: We prove rapid mixing of a quantum Gibbs sampler for general one-dimensional non-commuting local spin systems at every fixed positive temperature. In particular, for a system of $n$…
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Experimental subdiffraction source discrimination enabled by spatial demultiplexing and single-photon detectors
arXiv quant-ph
arXiv:2605.15929v2 Announce Type: replace Abstract: We experimentally demonstrate a universal, parameter-independent test for asymmetric source discrimination below the diffraction limit. The test exploits spatial-mode demultiplexing…
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Quantum-Inspired Optimization Process for Data Imputation
arXiv quant-ph
arXiv:2505.04841v3 Announce Type: replace Abstract: Data imputation is a critical preprocessing step, particularly in clinical datasets where missingness can bias downstream inference. We propose a quantum-inspired imputation framework and…
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Buffer-Qubit-Based Quantum Circuit Allocation Method Against Crosstalk Attacks
arXiv quant-ph
arXiv:2610.29050v1 Announce Type: new Abstract: Quantum Multi-Programming (QMP) enables the simultaneous execution of quantum circuits from multiple users on a single quantum chip in cloud quantum computing services. However, QMP is…
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Can Quantum Layers offer Performance and Security Advantages in Vision-Language Models?
arXiv quant-ph
arXiv:2610.28964v1 Announce Type: new Abstract: As quantum computing moves from the noisy intermediate-scale quantum (NISQ) era toward early fault-tolerant quantum computing (EFTQC), quantum-enhanced AI is shifting from a conceptual idea…
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The strengthened quantum Hamming bound of Yu, Lai, and Oh
arXiv quant-ph
arXiv:2610.30088v1 Announce Type: new Abstract: We prove a conjecture of Yu, Lai, and Oh: their rounded family of strengthened quantum Hamming bounds, which interpolates between Hamming-type bounds and the Singleton bound, holds for…
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Two particle interference: The Hanbury Brown Twiss and Hong Ou Mandel experiments
arXiv quant-ph
arXiv:2610.30002v1 Announce Type: new Abstract: I discuss two important quantum optics experiments which depend on two particle interference. In the years since their first demonstration many interesting and instructive variants have…
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Microscopic Parametric Correlations and Spectral Rigidity in the Non-Hermitian Threefold Way
arXiv quant-ph
arXiv:2609.13434v1 Announce Type: cross Abstract: We study microscopic spectral correlations between two nearby parameter values in the three non-Hermitian Gaussian bulk classes: $A$ (unconstrained), $AI^\dagger$ (complex symmetric), and…
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QUBO-Based Conformer Selection with Quantum-Classical Hybrid Optimization for Multiconformer Ligand Modeling
arXiv quant-ph
arXiv:2610.29058v1 Announce Type: new Abstract: A ligand can adopt multiple conformations within the same binding site, and these conformations can interact differently with the surrounding protein. Multiconformer modeling must therefore…
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Meter-scale quantum interconnects between large quantum processors
arXiv quant-ph
arXiv:2610.29986v1 Announce Type: new Abstract: Modular quantum architecture requires long-distance quantum interconnects to stitch together individual processor modules. Such interconnects, long-distance couplers or L-couplers, must…
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Hydrodynamic description of correlation matrix eigenvalues in a finite temperature expanding free fermionic gas
arXiv quant-ph
arXiv:2610.30062v1 Announce Type: new Abstract: A recent work considered the Page curve for entanglement entropy of a freely expanding one-dimensional Fermi gas starting from a finite box (the system) in a zero-temperature initial state…
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Graph-Theoretic Formulation of Hamiltonian and Ground-State Sign Structures in Heisenberg Antiferromagnets
arXiv quant-ph
arXiv:2602.04943v5 Announce Type: replace-cross Abstract: We study Heisenberg antiferromagnets through a graph-theoretic representation of their Hamiltonians. In the computational basis of a fixed-magnetization sector, the Heisenberg…
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Mixed-State Topology in One-Dimensional Open Floquet Systems
arXiv quant-ph
arXiv:2604.25248v3 Announce Type: replace-cross Abstract: We investigate the non-equilibrium topology of the steady state of a periodically driven, dissipative Su-Schrieffer-Heeger (SSH) chain using the ensemble geometric phase (EGP)…
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A random sampling method to test the weak Eigenstate Thermalization Hypothesis
arXiv quant-ph
arXiv:2610.30070v1 Announce Type: new Abstract: We introduce a random sampling method for testing the weak Eigenstate Thermalization Hypothesis (wETH) that is particularly useful for large, sparse Hamiltonians. We test the method on a…
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Continuity of certain quantum channel divergences
arXiv quant-ph
arXiv:2610.16270v2 Announce Type: replace Abstract: The geometric channel fidelity, the geometric R\'enyi divergences and the Belavkin--Staszewski relative entropy give converse bounds for capacities, discrimination and estimation…
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A group theoretic calculation of multi-invariants of some stabilizer states
arXiv quant-ph
arXiv:2610.27098v2 Announce Type: replace-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…