Quantum Computing
Quantum Computing news — Thursday 05 November 2026
150 stories from 2 sources, every one in English. Each links to its publisher.
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Quantinuum Raises Revenue Outlook After Landing Its Largest Cloud Agreement
The Quantum Insider
Insider Brief Quantinuum reported third-quarter revenue of $9.1 million, up 233% from a year earlier, and raised its full-year revenue forecast to between $31 million and $34 million. The company secured its largest cloud agreement…
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IonQ Raises Revenue Forecast as Quarterly Sales Climb to $173.8 Million
The Quantum Insider
Insider Brief IonQ reported third-quarter revenue of $173.8 million, up 336% from a year earlier, and raised its full-year revenue forecast to between $505 million and $515 million. IonQ advanced to Stage C of DARPA’s Quantum Benchmarking…
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MTSU Hosts Interstate Hackathon to Expand Quantum Computing Education
The Quantum Insider
Insider Brief Middle Tennessee State University (MTSU) led the three-day Interstate Quantum Hackathon, bringing together 250 registrants from 14 U.S. states and 29 countries to explore quantum computing. More than 40% of registrants…
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SEALSQ and Eco Wave Power Demonstrate Digital Energy Transactions for AI Data Centers
The Quantum Insider
Insider Brief SEALSQ , WISeQey, SEALCOIN and Eco Wave Power have signed a three-year MoU to explore secure digital systems connecting renewable-energy production with potential energy buyers, including AI data centers. The companies…
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Majorana qubits explained: The Quantum Kid goes inside Microsoft’s quantum lab
The Quantum Insider
Insider brief The Quantum Kid, produced by Tesseract Quantum, has released a new episode filmed inside Microsoft’s quantum lab in Lyngby, Denmark, produced in collaboration with Microsoft. Lauri Sainiemi, Vice President of Fabrication at…
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Horizon Quantum Plans to Acquire Entropica Labs for $27 Million
The Quantum Insider
Insider Brief Horizon Quantum has signed a non-binding letter of intent to acquire Singapore-based quantum software company Entropica Labs in a proposed transaction valued at approximately $27 million. The proposed consideration would…
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Oak Ridge National Laboratory, IBM And AMD Launch New Co-Design Platform for Quantum Error Correction
The Quantum Insider
Insider Brief IBM, Oak Ridge National Laboratory’s Quantum Science Center and AMD unveiled a joint platform integrating quantum and high-performance computing to advance quantum error correction. The initial deployment pairs IBM quantum…
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Quantinuum Maps Nexus Expansion Ahead of Planned 2029 Fault-Tolerant Computer
The Quantum Insider
Insider Brief Quantinuum unveiled a roadmap to expand Nexus into a platform for developing fault-tolerant quantum applications, aligned with hardware releases through its planned Apollo computer in 2029. Planned upgrades will automate…
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FCA to Test Quantum Machine Learning for Fraud and Money Laundering Detection
The Quantum Insider
Insider Brief The UK Financial Conduct Authority (FCA) will launch a Quantum Experimentation Group in the first quarter of 2027 to examine potential applications of quantum computing in financial services. The group will initially explore…
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Orange Joins Acceleronix and IDEMIA’s Quantum-Safe eSIM Provisioning Program
The Quantum Insider
Insider Brief Orange has joined the In-Factory Profile Provisioning (IFPP) program launched by Acceleronix and IDEMIA Secure Transactions, which enables manufacturers to provision eSIM operator profiles on production lines using…
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Bitcoin Cash Proposal Seeks Path to Quantum-Resistant Transactions
The Quantum Insider
Insider Brief Bitcoin Cash developers are reviewing a proposal to support post-quantum and hybrid signatures, with potential lock-in on Nov. 15, 2026, and activation targeted for May 15, 2027. The proposed OP_SIGHASH opcode would simplify…
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IQM Books €42.2 Million in Orders as Quarterly Revenue Rises 51% in Q3 2026
The Quantum Insider
Insider Brief IQM reported 51% revenue growth to €8.9 million and €42.2 million in new orders in the third quarter, led by a €33 million contract for its Halocene quantum computing platform. Outstanding customer orders reached €102.5…
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Marginal-constrained entropy accumulation theorem
arXiv quant-ph
arXiv:2502.02563v5 Announce Type: replace Abstract: We derive a novel chain rule for a family of channel conditional entropies, covering von Neumann and sandwiched R\'{e}nyi entropies. In the process, we show that these channel conditional…
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A Counterexample to the Weak Gibbs and Regularity Conjectures
arXiv quant-ph
arXiv:2611.06617v1 Announce Type: cross Abstract: We provide a counterexample to the weak Gibbs and regularity conjectures. The example is a spin-one system on the square lattice with a translation-invariant nearest-neighbor interaction…
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Dynamical Signatures of Selective Gap Closing in Multi-Dimensional Monotone Quasiperiodic Operators
arXiv quant-ph
arXiv:2611.05686v1 Announce Type: cross Abstract: We translate the spectral gap-closing criterion for multi-dimensional monotone quasiperiodic Schr\"odinger operators into a concrete dynamical protocol and verify it by large-scale…
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A Fully Polynomial Approximation Algorithm for the Sherrington-Kirkpatrick Model
arXiv quant-ph
arXiv:2611.05446v1 Announce Type: cross Abstract: Montanari's incremental approximate message passing (IAMP) algorithm [FOCS 2019; SIAM J. Comput., 2025] and the zero-temperature formulation of El Alaoui, Montanari and Sellke (AMS) [Ann…
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Finite-temperature transition-window weights on a fault-tolerant quantum computer: duplex filtering on a thermal purification
arXiv quant-ph
arXiv:2611.06809v1 Announce Type: new Abstract: The excite-filter-readout framework of Kharazi et al. computes zero-temperature response windows on a fault-tolerant quantum computer from a pure ground state. We extend it to Gibbs states…
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Entanglement Entropy in Non Relativistic Collisions
arXiv quant-ph
arXiv:2611.06774v1 Announce Type: new Abstract: We study numerically the build-up of entanglement entropy between two colliding, non relativistic particles, that are driven by the plain Schr\"odinger equation containing local, finite range…
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Phase-Locked Quantum Battery Charging via Dissipative Mode Selection
arXiv quant-ph
arXiv:2611.06712v1 Announce Type: new Abstract: We investigate how dynamical instability and reservoir engineering can be harnessed to enhance the quality of quantum-battery charging in a bosonic two-mode system. We show that…
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QASPA-MaxCut on Unweighted Graphs: Edge Encoding and QAOA Restarts
arXiv quant-ph
arXiv:2611.06698v1 Announce Type: new Abstract: Max-Cut is a common testbed for near-term quantum optimization because it has a simple Ising Hamiltonian, established classical baselines, and a parameterized quantum circuit whose…
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Flux Crosstalk Calibration from Zero Knowledge to High Precision in Fully Tunable Superconducting Circuits
arXiv quant-ph
arXiv:2611.06656v1 Announce Type: new Abstract: Precise and independent flux control is essential for scalable superconducting processors built from frequency-tunable qubits and couplers, but flux crosstalk undermines it. Conventional…
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Precision Limits and Non-Gaussian Advantage in Optical Phase Estimation under Preparation Constraints
arXiv quant-ph
arXiv:2611.06645v1 Announce Type: new Abstract: In optical quantum metrology, the scaling of the quantum Fisher information (QFI) with the mean photon number is a standard benchmark for relating precision to probe resources. For phase…
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Compatibility of Pauli Observables
arXiv quant-ph
arXiv:2611.06592v1 Announce Type: new Abstract: Given an arbitrary finite family of Pauli observables, how sharply can they be approximated by a single measurement? We derive an exact state-space correspondence that characterises the…
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Equivalence of Correlated Catalytic and Marginal Asymptotic Transformations in Quantum Resource Theories
arXiv quant-ph
arXiv:2611.06573v1 Announce Type: new Abstract: We prove that correlated-catalytic state conversion is possible if and only if the marginal asymptotic conversion rate is at least one. Under general operational assumptions, this equivalence…
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Parrondo's paradox for three discrete-time quantum walks with distinct shift operators
arXiv quant-ph
arXiv:2611.06568v1 Announce Type: new Abstract: Parrondo's paradox describes a surprising phenomenon in which certain combinations of biased quantum walks result in an unexpected reversal of their bias direction. To date, research on this…
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A Variational Quantum Algorithm for Multi-Skill Project Scheduling
arXiv quant-ph
arXiv:2611.06502v1 Announce Type: new Abstract: Job scheduling is an NP-hard optimization problem with clear industrial relevance. In practice, distributing work across a team is not only about meeting deadlines or improving productivity…
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Quantum Advantage needs Multiple Perspectives
arXiv quant-ph
arXiv:2611.06497v1 Announce Type: new Abstract: The origin of the quantum speedup is a topic of ongoing research. We propose a logical criterion for the possibility of a speedup within the continuous-variable and odd-prime qudit settings…
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Beyond the Gap: What Imaginary-Time Evolution Reveals About the Edge of the Continuum
arXiv quant-ph
arXiv:2611.06454v1 Announce Type: new Abstract: The spectral gap, the energy separating the ground state from the first excitation, governs many quantum phenomena, yet it is far harder to compute than the ground state. We propose a…
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Improved Exact and Approximate Quantum Fourier Transforms from Multiplication
arXiv quant-ph
arXiv:2611.06341v1 Announce Type: new Abstract: In the world of quantum computing, quantum Fourier transform (QFT) has been one of the most important subroutines for quantum algorithms, as exemplified by Shor's factoring algorithms and…
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Semi-Device-Independent Certification of multi-qubit Entangled Basis Measurement
arXiv quant-ph
arXiv:2611.06337v1 Announce Type: new Abstract: The entangled basis measurement plays a pivotal role in fundamental information-processing tasks, such as dense coding, quantum teleportation, and entanglement swapping. Consequently…
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Spatial Path Superposition: A No-Cloning Perspective on MIMO-Inspired Spatial Diversity
arXiv quant-ph
arXiv:2611.06306v1 Announce Type: new Abstract: Spatial diversity is a key mechanism in classical Multi-Input Multi-Output (MIMO) communications, where multiple propagation alternatives provide redundant observations that improve…
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Connection of surface code patches based on entanglement distillation without postselection
arXiv quant-ph
arXiv:2611.06260v1 Announce Type: new Abstract: Distributed quantum computing is a promising approach for overcoming the scalability limitations of fault-tolerant quantum computing. Entanglement distillation, a process that extracts…
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Resetting a Superconducting Qubit with a Compact Colder Resistive Dissipator below the Qubit Frequency
arXiv quant-ph
arXiv:2611.06216v1 Announce Type: new Abstract: Efficient qubit reset has become a key requirement for large-scale superconducting quantum processors, as initialization fidelity increasingly lags behind gate performance and quantum error…
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Spatial Cost of Recovering a Fusion Qubit in a Critical Spin Chain
arXiv quant-ph
arXiv:2611.06215v1 Announce Type: new Abstract: Vanishing-error recovery of a fusion qubit from a fixed-sector ground doublet of four Kramers--Wannier defects in a critical Ising chain requires at least the shorter three-defect span of…
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Robust Geometric Gates for QCCD Architecture
arXiv quant-ph
arXiv:2611.06136v1 Announce Type: new Abstract: The trapped-ion quantum charge-coupled device (QCCD) is a promising route toward scalable quantum computing. However, the frequency offset during shuttling operations introduce significant…
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Shadow bootstrapping: Nearly minimal-setting pure-state tomography with shallow Clifford measurements
arXiv quant-ph
arXiv:2611.06073v1 Announce Type: new Abstract: We present a pure-state tomography algorithm that uses a nearly minimal number of measurement settings while achieving optimal sample complexity with nonadaptive single-copy shallow Clifford…
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Sample-based Quantum Diagonalization via Density Matrix Renormalization Group
arXiv quant-ph
arXiv:2611.05975v1 Announce Type: new Abstract: We introduce SqDMRG, which combines sample-based quantum diagonalization (SQD) with the density matrix renormalization group (DMRG). SqDMRG expands the sampled determinant space into a…
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The Structure of Shared Classical Facts in Quantum Systems
arXiv quant-ph
arXiv:2611.05955v1 Announce Type: new Abstract: Perfectly matching local outcomes need not constitute a nondisturbing shared classical record. For finite-dimensional multipartite states, we prove that nontrivial exact records are…
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Algorithmic Wave-Particle Duality: Pathfinding in Welded Trees is Hard
arXiv quant-ph
arXiv:2611.05912v1 Announce Type: new Abstract: In the welded trees problem, an algorithm navigates a randomly labeled graph formed from two binary trees joined at their leaves through a "weld" of connecting edges. A quantum walk can…
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Hardware Demonstration of Neural-Surrogated Quantum-Enhanced MCMC for Large-Scale Constrained Boltzmann Sampling
arXiv quant-ph
arXiv:2611.05883v1 Announce Type: new Abstract: Neural-surrogated quantum-enhanced Markov chain Monte Carlo (QeMCMC) uses neural networks trained on samples from the quantum approximate optimization algorithm (QAOA) to accelerate Boltzmann…
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Quantum Advantage in Sensing and Imaging through Coherent Nuisance Suppression
arXiv quant-ph
arXiv:2611.05868v1 Announce Type: new Abstract: Many sensing and imaging problems must contend with unknown nuisance parameters such as aberrations, background fields, and drift, and the cost of removing these noise sources can dominate…
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Efficiently tracking errors and outcomes in universal quantum circuits
arXiv quant-ph
arXiv:2611.05867v1 Announce Type: new Abstract: We present a method for efficient simulation of error propagation and decoding in universal fault-tolerant quantum circuits under stochastic Pauli noise, requiring only that the circuit has a…
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Classical records and Bell correlations in a dynamically formed quantum body
arXiv quant-ph
arXiv:2611.05826v1 Announce Type: new Abstract: Competing quantum contacts can create a boundary that was absent from the specification of a subsystem. We construct approximately isolated bodies from bare field vacuum and zero-centred…
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Structural Lower Bounds for Quantum Property Estimation with Persistent Memory
arXiv quant-ph
arXiv:2611.05792v1 Announce Type: new Abstract: In quantum property estimation, an experimenter estimates $\operatorname{Tr}(O\rho)$ for a family of observables from independent copies of an unknown state $\rho$ simultaneously to additive…
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Tensor-network simulation of strongly coupled multi-fluxonium circuits
arXiv quant-ph
arXiv:2611.05627v1 Announce Type: new Abstract: Designing a superconducting quantum processor rests on predicting the low-lying spectrum of its coupled circuit. The Hilbert-space dimension of the circuit's lumped-element model grows…
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Quantum resource trade-offs of mixed sparse single and double factorization for qubitization-based phase estimation
arXiv quant-ph
arXiv:2611.05603v1 Announce Type: new Abstract: We study a mixed block encoding of quantum-chemistry Hamiltonians for quantum phase estimation (QPE) on fault-tolerant quantum computers. Following a Cholesky decomposition of the electron…
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Multipartite entanglement swapping with homodyne and single photon detection
arXiv quant-ph
arXiv:2611.05597v1 Announce Type: new Abstract: Establishing multipartite entanglement across lossy optical networks remains a central challenge for distributed quantum information processing. Here, we consider a non-Gaussian…
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Higher-order quantum information inequalities and error-correction of non-Markovian noise
arXiv quant-ph
arXiv:2611.05541v1 Announce Type: new Abstract: Defining entropy of a quantum channel has become a challenge with potential candidates recently reported in literature. In this Article, it is taken under consideration the entropy of a…
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Quantum error correcting codes from quiver moduli: Grassmannians, cyclic monodromy, and argyle collision divisors
arXiv quant-ph
arXiv:2611.05526v1 Announce Type: new Abstract: Building on aspects of a recent diagrammatic field-theory programme for quantum error correction put forward by the first-named author (arXiv:2607.08911), we construct exact…
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Raychaudhuri-Ehlers Kinematics on Quantum State-Space: Caustics and Extrinsic Quantum Geometry
arXiv quant-ph
arXiv:2611.05499v1 Announce Type: new Abstract: Quantum mechanics is inherently geometric in that the pure states form a curved complex manifold and the Schr\"odinger evolution defines a Hamiltonian flow on this space. Geometry identifies…
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Boosted Entanglement Swapping
arXiv quant-ph
arXiv:2611.05497v1 Announce Type: new Abstract: Entanglement swapping entangles photons that never interacted directly. When implemented with linear optics, its success probability is upper bounded by $50\%$, due to the limited efficiency…
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Krylov meets Fock: Complementary lenses on quantum dynamics
arXiv quant-ph
arXiv:2611.05495v1 Announce Type: new Abstract: Quantum dynamics in Krylov space can be represented by a particle hopping on a chain whose sites are the Krylov basis vectors. The goal of this work is to extend this idea to the Fock basis…
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Zero noise extrapolation of transport coefficients
arXiv quant-ph
arXiv:2611.05481v1 Announce Type: new Abstract: NISQ devices routinely estimate properties of the noiseless system from measurements at varying noise strengths $\gamma$. These zero-noise extrapolation (ZNE) schemes fail to estimate…
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Noise-Induced Topology in Chiral Quantum Walks
arXiv quant-ph
arXiv:2611.05471v1 Announce Type: new Abstract: Noise typically destroys quantum coherence and washes out transport phenomena that rely on interference. Chiral quantum walks are a case in point: a particle hopping on a lattice threaded by…
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Toward a Quantum Information Foundation for Neutron Scattering
arXiv quant-ph
arXiv:2611.05466v1 Announce Type: new Abstract: Neutron scattering is a central probe of quantum materials, yet what quantum information can, in principle, be extracted from a scattering experiment remains unclear. Here we formulate…
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Spectral measures and sharpness of quantum speed limits
arXiv quant-ph
arXiv:2611.05462v1 Announce Type: new Abstract: Quantum speed limits bound the time required for a given state to evolve into a given subspace of the Hilbert space under specific energy constraints. We prove that for several standard…
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Three-dimensional QCA that are not stably circuits
arXiv quant-ph
arXiv:2610.40235v2 Announce Type: replace-cross Abstract: We prove that the three-dimensional chiral $\Z_p$ Clifford quantum cellular automata of Haah and of Sun--Yang--Wang--Tantivasadakarn--Chen are, for every odd prime $p$, not…
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Quantum estimates for classical polynomial optimization
arXiv quant-ph
arXiv:2607.25445v3 Announce Type: replace-cross Abstract: The problem of finding lower and upper bounds on multivariate homogeneous polynomials is both difficult and important given its applications to questions ranging from dynamical…
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Complexity of tensor network simulation for noisy quantum circuits
arXiv quant-ph
arXiv:2606.00474v2 Announce Type: replace-cross Abstract: We aim to rigorously address how local noise affects the classical simulability of quantum dynamics benchmarked by tensor-network methods. Using operator entanglement entropy (OEE)…
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Hidden weak-pairing superconductivity of non-interacting anyons obeying 1/3 statistics
arXiv quant-ph
arXiv:2605.19036v2 Announce Type: replace-cross Abstract: We show that a non-interacting gas of charge-$e/3$ anyons with exchange statistics $\theta=-\pi/3$ can superconduct through a hidden weak-pairing mechanism. Such an anyon gas arises…
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Quantum-Inspired Tensor Network Autoencoders for Anomaly Detection: A MERA-Based Approach
arXiv quant-ph
arXiv:2604.06541v2 Announce Type: replace-cross Abstract: We investigate whether a multiscale tensor-network architecture provides a useful inductive bias for reconstruction-based anomaly detection in collider jets. Jets are produced by a…
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Emergent thermal fluctuations and non-Hermitian phase transitions in open photon condensates
arXiv quant-ph
arXiv:2603.21927v2 Announce Type: replace-cross Abstract: Driven-dissipative Bose-Einstein condensates of photons in optical resonators have been shown theoretically to exist as a long-lived, yet metastable state stabilized by a ghost…
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Second law of thermodynamics in closed quantum many-body systems
arXiv quant-ph
arXiv:2602.06657v3 Announce Type: replace-cross Abstract: The second law of thermodynamics for adiabatic operations -- constraints on state transitions in closed systems under external control -- is one of the fundamental principles of…
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Quantum Noise Spectroscopy of Criticality in an Atomically Thin Magnet
arXiv quant-ph
arXiv:2407.05614v3 Announce Type: replace-cross Abstract: The universality class of a phase transition dictates the behavior of low-frequency and long-wavelength critical fluctuations in a material. Studying these dynamics in thin magnetic…
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Dynamical-mean-field cluster-correlation expansion of NV$^-$ spin-echo decoherence in a realistic substitutional-nitrogen bath
arXiv quant-ph
arXiv:2611.02528v2 Announce Type: replace Abstract: The Hahn-echo time $T_2$ of nitrogen-vacancy (NV$^-$) ensembles in nitrogen-rich diamond follows the empirical relation $T_2\cdot$[N] = 160 $\mu$s ppm, and this relation does not depend…
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Pump-scheme dependence of few-emitter lasers: exact multilevel correlations and photon statistics
arXiv quant-ph
arXiv:2611.01205v2 Announce Type: replace Abstract: Few-emitter laser models usually replace the excitation cycle of the gain medium by a single Markovian pump jump of a two-level emitter. We test this replacement with the cavity and…
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Implications of the PXP ground-state sign structure for neural-network variational Monte Carlo
arXiv quant-ph
arXiv:2611.00603v2 Announce Type: replace Abstract: Positive-definite neural-network quantum states cannot directly represent the ground state of the PXP Hamiltonian, since the ground-state wavefunction carries a nontrivial relative-sign…
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Toric codes all the way down: decoupling translation-invariant topological CSS codes in higher dimensions
arXiv quant-ph
arXiv:2610.40592v2 Announce Type: replace Abstract: Topological Calderbank-Shor-Steane (CSS) codes in more than two spatial dimensions offer features useful for fault-tolerant quantum computation, such as transversal non-Clifford gates and…
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On the Quantum Chromatic Gap II
arXiv quant-ph
arXiv:2610.40571v2 Announce Type: replace Abstract: We confirm a conjecture of the first author [SODA'26] on a strong form of pseudo-telepathy for Khot's $d$-to-$1$ games: for every $d\geq 4$, every $\epsilon>0$, and every $k\in\mathbb N$…
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Coherent Optical Control of a Single Donor Electron Spin
arXiv quant-ph
arXiv:2610.36423v2 Announce Type: replace Abstract: Coherent spin--photon interfaces for scalable quantum networks require bright optical transitions, long-lived spin coherence, and complete coherent spin control. Donor spins in…
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A classical oracle separation between QMA and QMA(2)
arXiv quant-ph
arXiv:2610.06760v2 Announce Type: replace Abstract: We exhibit a classical oracle relative to which QMA \neq QMA(2). The separation is based on a separable Hamiltonian problem defined by signed edge constraints on a graph. The YES…
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Quantum Leakage from Shamir Sharing with Correlated Resources
arXiv quant-ph
arXiv:2610.06350v2 Announce Type: replace Abstract: We bound local quantum leakage from Shamir sharing uniformly over prime fields and permitted share-dependent channels. The adversary receives all outputs and a reference to a resource…
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Energy-filtered readout preserves gap-enhanced sensing in interacting quantum dots
arXiv quant-ph
arXiv:2610.04063v2 Announce Type: replace Abstract: A small excitation gap makes a quantum dot a sensitive probe of a weak electric field, but the charge detector reading it can also excite it. We calculate how much of this enhancement…
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Quantum Magnonics: Quantum States Generation and Applications
arXiv quant-ph
arXiv:2607.27771v2 Announce Type: replace Abstract: Hybrid systems based on magnons in ferromagnetic materials, such as yttrium iron garnet, have achieved remarkable development in the last decade. These include the coupling of magnons to…
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Phase Retrievability of Super Operators and Measurements
arXiv quant-ph
arXiv:2607.26474v3 Announce Type: replace Abstract: We continue the study of Phase Retrieval in the Quantum Information setting in the style of \cite{liu2023phase}, in a manner which is more general in two primary ways: (a) Instead of only…
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Attosecond delay metrology beyond the photon coherence time with spectrally resolved Hong-Ou-Mandel interferometry
arXiv quant-ph
arXiv:2607.16849v2 Announce Type: replace Abstract: Hong-Ou-Mandel (HOM) interferometry enables delay estimation at the quantum precision limit but is traditionally constrained to path differences within the coherence time of the…
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Quantum stochastic thermodynamics of macroscopic systems: an algebraic approach
arXiv quant-ph
arXiv:2607.09242v2 Announce Type: replace Abstract: We build a framework for the thermodynamics of macroscopic quantum systems. In contrast with approaches requiring access to the full density matrix, our framework relies on a…
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Working With Measurement-Based Computations on Qudits
arXiv quant-ph
arXiv:2606.30525v2 Announce Type: replace Abstract: Measurement-based quantum computing is a universal model of quantum computation in which successive product measurements of an entangled resource state drive the computation. The…
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All-optical Implementation of Generalized Quantum Teleportation
arXiv quant-ph
arXiv:2606.22736v3 Announce Type: replace Abstract: Measurement-based continuous-variable optical quantum computing inherently offers high-speed, large-scale operations, yet its practical performance remains constrained by the processing…
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Quadratic speed-up of quantum adiabatic evolution with engineered dissipation
arXiv quant-ph
arXiv:2606.05815v2 Announce Type: replace Abstract: Quantum adiabatic evolution is often slowed by nonadiabatic leakage near small spectral gaps. We propose an engineered dissipative protocol that continuously relaxes these excitations…
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Hybrid Clifford Codes via Operator Algebra Quantum Error Correction and Projective Representation Theory
arXiv quant-ph
arXiv:2606.02531v2 Announce Type: replace Abstract: Clifford codes are a natural generalization of quantum stabilizer codes based primarily on representation theory. This class of codes has previously been extended to the setting of…
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Detecting bipartite entanglement with PnCP maps and non-negative polynomials
arXiv quant-ph
arXiv:2605.30426v2 Announce Type: replace Abstract: Positive non-Completely Positive (PnCP) maps are an essential tool to detect entanglement since their characterization is a dual aspect of the separability problem. A recent algorithm…
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Sharp Bounds on the Eigenvalues of Kikuchi Graphs and Applications to Quantum Max Cut
arXiv quant-ph
arXiv:2605.14994v2 Announce Type: replace Abstract: We prove that the maximum eigenvalue of the (both signed and unsigned) Laplacian of level $k$ Kikuchi graph of any graph $G$ with $m$ edges is at most $m+k$. This confirms four recent…
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Squeezing Enhancement Through Resonant Interference in Multi-ring Resonators
arXiv quant-ph
arXiv:2605.10731v2 Announce Type: replace Abstract: We develop a non-perturbative description of squeezed light generation in an arbitrary lossy structure consisting of multiple coupled microring resonators. This is applied to two ring…
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Evaluating quantum circuits in the reservoir computing paradigm
arXiv quant-ph
arXiv:2605.01253v3 Announce Type: replace Abstract: Reservoir computing is a framework for learning temporal correlations in time series data by leveraging the intrinsic dynamics of an underlying physical system. In quantum…
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Demonstrating Record Fidelity for the Quantum Fourier Transform
arXiv quant-ph
arXiv:2604.12465v3 Announce Type: replace Abstract: We demonstrate the Parity Architecture on quantum hardware, using the quantum Fourier transform (QFT) as a benchmark. As a result, a record performance in both fidelity and qubit count is…
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Unlocking a fast adiabatic CZ gate and exact residual $ZZ$ cancellation between fixed-frequency transmons using a floating tunable coupler
arXiv quant-ph
arXiv:2604.05048v2 Announce Type: replace Abstract: Tunable couplers in superconducting qubit architectures enable strong qubit-qubit interactions for two-qubit gates while suppressing unwanted coupling during single-qubit operations…
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Decoherence and the Reemergence of Coherence From a Superconducting "Horizon"
arXiv quant-ph
arXiv:2603.16765v3 Announce Type: replace Abstract: In a recent paper [arXiv:2205.06279], Danielson et al. demonstrated that the mere presence of a black hole causes universal decoherence of quantum superpositions (dubbed the DSW…
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Generalized Inverses of Quantum Channels: a categorical perspective
arXiv quant-ph
arXiv:2603.13946v2 Announce Type: replace Abstract: A quantum channel is defined as being completely positive (CP) and trace preserving (TP). While not every quantum channel is invertible or reversible, every quantum channel admits various…
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Efficient Classical Simulation of Low-Rank-Width Quantum Circuits Using ZX-Calculus
arXiv quant-ph
arXiv:2603.06764v2 Announce Type: replace Abstract: In this paper, we introduce an algorithm for contracting (i.e. numerically evaluating) ZX-diagrams whose computational complexity is governed by rank-width, a structural graph parameter…
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Completeness for Prime-Dimensional Phase-Affine Circuits
arXiv quant-ph
arXiv:2603.06466v4 Announce Type: replace Abstract: Equational reasoning about circuits underpins quantum-circuit optimisation and verification. In the qubit CNOT-dihedral fragment, phase polynomials and layered normal forms support a…
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Quantum Advantage for Sensing Properties of Classical Fields
arXiv quant-ph
arXiv:2602.17591v2 Announce Type: replace Abstract: Modern precision experiments often probe unknown classical fields with bosonic sensors in quantum-noise-limited regimes where vacuum fluctuations limit conventional readout. We introduce…
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Entropic Barriers and the Kinetic Suppression of Topological Defects
arXiv quant-ph
arXiv:2602.16777v4 Announce Type: replace Abstract: Many quantum phases, from topological orders to superfluids, are destabilized at finite temperature by the proliferation and motion of topological defects such as anyons or vortices…
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Bidirectional teleportation using scrambling dynamics: a practical protocol
arXiv quant-ph
arXiv:2601.15536v2 Announce Type: replace Abstract: We show that quantum information scrambling can enable a generic SWAP gate between collective degrees of freedom in systems without universal local control. Our protocol combines a…
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Cost scaling of MPS and TTNS simulations for 2D and 3D systems with area-law entanglement
arXiv quant-ph
arXiv:2601.08132v2 Announce Type: replace Abstract: Tensor network states are an indispensable tool for the simulation of strongly correlated quantum many-body systems. In recent years, tree tensor network states (TTNS) have been…
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Tree tensor network states represent low-energy states faithfully
arXiv quant-ph
arXiv:2512.20215v2 Announce Type: replace Abstract: Extending corresponding results for matrix product states [Verstraete and Cirac, PRB 73, 094423 (2006); Schuch et al. PRL 100, 030504 (2008)], it is shown how the approximation error of…
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Single-Photon Scattering in a Waveguide Coupled to a Giant Atom with Loss or Gain
arXiv quant-ph
arXiv:2512.17456v2 Announce Type: replace Abstract: This work investigates single-photon scattering in a one-dimensional coupled-resonator waveguide interacting with a giant atom with a complex on-site energy. Within the generalized…
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Quantum-elevated Chiral Discrimination for Bio-molecules
arXiv quant-ph
arXiv:2511.03412v3 Announce Type: replace Abstract: Chiral discrimination of enantiomeric biomolecules is vital in chemistry, biology, and medicine. Conventional methods, relying on circularly polarized light, face weak chiroptical signals…
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Quantum Information Transmission Over Quantum Relay Channels
arXiv quant-ph
arXiv:2507.06770v3 Announce Type: replace Abstract: Quantum relays are central to both quantum communication and distributed quantum computing, enabling long-distance transmission and modular architectures. Unlike classical repeaters…
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Entangled quantum trajectories in relativistic systems
arXiv quant-ph
arXiv:2410.05995v2 Announce Type: replace Abstract: Quantum entanglement is a key resource for quantum technologies, including emerging ground-to-satellite quantum communication. In such a scenario, an important challenge to be overcome is…
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Approaching the Landauer Bound without Slowing Down
arXiv quant-ph
arXiv:2407.03096v2 Announce Type: replace Abstract: Finite-time memory erasure is conventionally understood to incur an additional energy cost beyond the Landauer bound. Whether this bound can be approached without taking the infinite-time…
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Quantum power iterations via tensor networks
arXiv quant-ph
arXiv:2404.15048v2 Announce Type: replace Abstract: In optimization, one of the well-known classical algorithms is power iterations, which recovers the dominant eigenvector of a diagonalizable matrix. Since numerous optimization problems…
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3D Printed Monolithic Optomechanical Chassis for an Unbalanced Field-Widened Interferometer
arXiv quant-ph
arXiv:2611.06898v1 Announce Type: cross Abstract: Additive manufacturing is increasingly being explored as an approach for producing complex structures for optical hardware. In this work, we present a fully monolithic optomechanical…
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Cryogenic suppression of correlated loss in Rydberg atom arrays
arXiv quant-ph
arXiv:2611.06613v1 Announce Type: cross Abstract: Blackbody radiation (BBR) poses a central challenge for quantum science with Rydberg atoms. By driving transitions to nearby opposite-parity states, BBR shortens Rydberg lifetimes and has…
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Thermodynamics-Informed Learning Captures Hierarchical Hydrogen-Bond Networks in Deep Eutectic Solvents
arXiv quant-ph
arXiv:2611.06590v1 Announce Type: cross Abstract: Deep eutectic solvents (DESs) offer a tunable platform for lignocellulose refining, but their solvation behavior depends on multicomponent hydrogen-bond networks rather than individual…
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Spectral properties of twisted soft waveguides
arXiv quant-ph
arXiv:2611.06558v1 Announce Type: cross Abstract: We discuss a model of a soft waveguide described by Schr\"{o}dinger operator whose potential is a twisted straight channel of non-circular profile. We show that a compactly supported twist…
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A Tensor-Network Chebyshev--Galerkin Method for Boundary-Value Problems in Computational Mechanics
arXiv quant-ph
arXiv:2611.06552v1 Announce Type: cross Abstract: Quantum-inspired numerical methods for partial differential equations represent discretized fields and operators as quantics tensor trains (QTT), so that their cost depends on how…
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Stability of energy gap of macroscopic quantum matter
arXiv quant-ph
arXiv:2611.06528v1 Announce Type: cross Abstract: In quantum many-body physics and quantum field theory, it is often assumed that gapped systems remain gapped under sufficiently weak local perturbations. However, to what extent this…
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Quasi-Normal Modes and thermalization in integrable Quantum Field Theories from the Thermodynamic Bethe Ansatz
arXiv quant-ph
arXiv:2611.06473v1 Announce Type: cross Abstract: We propose a Thermodynamic Bethe Ansatz (TBA) approach for describing thermalization in integrable quantum field theories. The exponential damping and oscillations when approaching thermal…
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Constraining Lorentz Invariance Violation via Precision Atomic Spectroscopy
arXiv quant-ph
arXiv:2611.06392v1 Announce Type: cross Abstract: This paper investigates Lorentz violation arising from quantum gravity effects in electronic and muonic hydrogen atoms. The violation is modeled through a modified dispersion relation…
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Kardar--Parisi--Zhang density hydrodynamics in a coherent XXZ--ASEP Lindbladian
arXiv quant-ph
arXiv:2611.06369v1 Announce Type: cross Abstract: Coherent interactions can generate quantum correlations without changing a stationary density current. Whether that current still determines long-wavelength transport is a dynamical…
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Hyperbolic Nanocavities for Single-Molecule Vibrational Strong Coupling
arXiv quant-ph
arXiv:2611.06240v1 Announce Type: cross Abstract: Hyperbolic phonon polaritons (HPhPs) in low-loss anisotropic materials such as hexagonal boron nitride (hBN) provide extreme sub-diffractional field confinement in the mid-infrared, making…
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Statistical mechanics and hierarchy of learnability in quantum codes: From generalized symmetries to non-Abelian topological orders
arXiv quant-ph
arXiv:2611.06154v1 Announce Type: cross Abstract: Local weak measurements provide noisy information about observables encoded in a quantum code. We formulate the corresponding Bayesian inference problem for a broad class of topological…
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Quantum Computing for Entanglement Asymmetry and the Quantum Mpemba Effect in Field Theory
arXiv quant-ph
arXiv:2611.05987v1 Announce Type: cross Abstract: We construct a quantum measurement protocol for estimating the R\'enyi entanglement asymmetry, which quantifies symmetry breaking at the level of a subsystem and provides a probe of the…
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Magnetic Bloch eigenvalue problems in nonuniform periodic magnetic fields: a Fourier-finite difference approach
arXiv quant-ph
arXiv:2611.05950v1 Announce Type: cross Abstract: We study magnetic Bloch eigenvalue problems for two-dimensional magnetic Schr\"odinger operators with nonuniform periodic magnetic fields and periodic scalar potentials, and develop a…
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Analytic two-body density-matrix spectrum of the Fermionic Tonks-Girardeau gas
arXiv quant-ph
arXiv:2611.05820v1 Announce Type: cross Abstract: The two-body density matrix (TBDM) of a quantum many-body system provides information about particle correlations, e.g., pairing. In this work, we derive the complete spectrum of the TBDM…
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Emergent Incompressibility in Polariton Condensates for Scalable XY Spin Simulation
arXiv quant-ph
arXiv:2611.05782v1 Announce Type: cross Abstract: Driven-dissipative polariton networks offer a powerful analog platform for simulating continuous-spin Hamiltonians. However, their practical scalability is fundamentally limited by…
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Coherence Spreading Law in Quenched Homogeneous Bose Gases
arXiv quant-ph
arXiv:2611.05775v1 Announce Type: cross Abstract: We investigate nonequilibrium coherence spreading in quenched homogeneous bosonic gases both analytically and numerically. Our ensemble-averaged Gross-Pitaevskii trajectory approach and…
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Exact teleportation bounds for fermionic Hawking thermality beyond the single-mode approximation
arXiv quant-ph
arXiv:2611.05773v1 Announce Type: cross Abstract: Fermionic teleportation near a Schwarzschild horizon involves two physically distinct ingredients that are often varied together: Hawking thermal mixing and the relative composition of the…
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Static and dynamical Casimir effects in a wedge within the worldline formulation
arXiv quant-ph
arXiv:2611.05768v1 Announce Type: cross Abstract: We study a real massless scalar field in $d+1$ dimensions confined to a wedge of opening angle $\alpha$, in the presence of a semitransparent circular arc that may oscillate radially…
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Exact Mirror-Parity Selection Rule for Electron-Phonon Coupling in Two-Dimensional Crystals
arXiv quant-ph
arXiv:2611.05710v1 Announce Type: cross Abstract: The electron--phonon (e-ph) interaction underlies conventional superconductivity and plays a central role in transport and other many-body phenomena in solids. Here, we derive a symmetry…
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Quantum computing for high energy nuclear physics
arXiv quant-ph
arXiv:2611.05491v1 Announce Type: cross Abstract: Quantum information science (QIS) offers a new set of conceptual and computational tools ideally suited to exploring the many-body, out-of-equilibrium, and real-time properties of strongly…
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Stabiliser codes over prime fields as weighted graphs and as quantum sets of lines
arXiv quant-ph
arXiv:2611.05489v1 Announce Type: cross Abstract: We further develop the theory of quantum stabiliser codes and its links with graph theory and finite geometry. We prove that an [[n,k,d]]_p stabiliser code over a finite field with p…
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Shapiro spikes in driven quantum fluids
arXiv quant-ph
arXiv:2611.05477v1 Announce Type: cross Abstract: Periodic driving of a Josephson junction produces resonant transport signatures known as Shapiro spikes, conventionally described by effective circuit models. Here, we demonstrate Shapiro…
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Superconducting Qubits as Quantum Targets for Direct Particle Scattering
arXiv quant-ph
arXiv:2611.05469v1 Announce Type: cross Abstract: We introduce a novel approach to particle detection in which a superconducting qubit itself serves as the scattering target and a resolved transition between circuit eigenstates constitutes…
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Photon-Counting Readout via Electro-Optic Microwave-to-Optical Transduction for Axion Haloscopes
arXiv quant-ph
arXiv:2611.05444v1 Announce Type: cross Abstract: Axion dark matter searches require highly sensitive detection schemes with high scan rate to efficiently explore the parameter space. Building upon the conventional Sikivie haloscope, where…
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Estimating the generator of matrix exponential time-series
arXiv quant-ph
arXiv:2611.04521v1 Announce Type: cross Abstract: The achievable precision in estimating the spectrum of a time-series signal that is promised to be sparse in Fourier space deteriorates rapidly as the spectral peaks get closer together, as…
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LaQX: A JAX Toolkit for Neural Quantum State Simulations of Lattice Quantum Many-Body Models
arXiv quant-ph
arXiv:2611.04333v1 Announce Type: cross Abstract: Neural quantum states provide accurate variational representations for interacting lattice fermions and spins. Turning a new ansatz into a reproducible calculation, however, requires…
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Cryptanalysis of Isogeny-Based Quantum Money with Rational Points
arXiv quant-ph
arXiv:2508.00351v2 Announce Type: cross Abstract: Quantum money is a representative application in cryptography that utilizes quantum technology to achieve security that is unattainable with classical systems. Since the theoretical…
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Using topology to reveal all mutually unbiased bases in dimension six
arXiv quant-ph
arXiv:2611.06917v1 Announce Type: new Abstract: Mutually unbiased bases (MUBs) describe complementary quantum measurements: certainty in one basis gives no information about the others. In dimension six, triples of MUBs are known, but…
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Arithmetic Depth, Minimal Gate Alphabets, and Exact Program-State Resources for Single-Qubit Dyadic Programs
arXiv quant-ph
arXiv:2611.06909v1 Announce Type: new Abstract: Resource analyses for quantum programs commonly provide safe upper bounds on qubits, gates, or non-Clifford operations. We study a single-qubit dyadic fragment in which the deepest exact…
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A hybrid quantum-classical neural network for learning to route
arXiv quant-ph
arXiv:2609.00489v2 Announce Type: replace-cross Abstract: This work studies hybrid quantum-classical neural networks for learning routing heuristics. Specifically, this paper asks whether small quantum neural networks can replace…
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Optimal Holding Times for Entanglement Swapping
arXiv quant-ph
arXiv:2611.06823v1 Announce Type: new Abstract: We revisit the optimization of entanglement holding times in memory-based quantum repeaters for maximizing entanglement swapping throughput under different fidelity constraints - strict…
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Quantum Algorithms for Molecular Response Functions: Resolvent Kernels, Time-Domain Sampling, Query Lower Bounds with Matched Single-Point Calibers, and a Six-Route Comparison
arXiv quant-ph
arXiv:2611.06821v1 Announce Type: new Abstract: Quantum algorithms for molecular response functions have mostly been studied one route at a time, most prominently the indicator-binning algorithm of Kharazi et al. We compare six routes…
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GFlowQEC: Generative Flow Networks that Learn to Sample Quantum LDPC Codes
arXiv quant-ph
arXiv:2611.06819v1 Announce Type: new Abstract: Choosing a quantum error-correcting code for a real device means scoring candidates with circuit-level simulations so slow that only a few hundred can be run. So every evaluation counts, and…
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Linear-time erasure recovery for quantum expander codes
arXiv quant-ph
arXiv:2611.06818v1 Announce Type: new Abstract: Erasures are used to model faults at a subset of known locations in various platforms used to construct fault-tolerant quantum computers. Beyond the utility in erasure recovery, efficient…
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Resource-efficient formulations of the Knapsack problem for quantum computing
arXiv quant-ph
arXiv:2611.06797v1 Announce Type: new Abstract: Quantum computing has emerged as a new tool for solving combinatorial optimization problems. Quantum optimization approaches usually operate on the subclass of Quadratic Unconstrained Binary…
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Non-compact Kogut-Susskind gauge theories: 1D lattice models with exact ${\rm SL}(2,\mathbb{R})$ gauge invariance
arXiv quant-ph
arXiv:2611.06771v1 Announce Type: new Abstract: The Kogut-Susskind (KS) formulation of gauge theories constructs quantum many-body Hamiltonians with gauge invariance under a compact Lie group exactly implemented on a spatial lattice. Here…
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Near-Quantum-Limited Readout for the Princeton Axion Search using a sub-GHz Kinetic Inductance Traveling Wave Parametric Amplifier
arXiv quant-ph
arXiv:2611.06761v1 Announce Type: new Abstract: Parametric amplifiers are a workhorse for near-quantum-limited measurements above 1 GHz. However, amplifier development has been more limited below 1 GHz. We present a kinetic inductance…
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A Quantum Lower Bound for Triangle Finding
arXiv quant-ph
arXiv:2611.06751v1 Announce Type: new Abstract: Triangle finding is a fundamental problem in graph theory that has played a central role in the development of quantum algorithmic techniques. For $N$-vertex graphs given by their adjacency…
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Solving a non-abelian hidden subgroup problem on a trapped-ion quantum computer: the power of the measurement basis
arXiv quant-ph
arXiv:2611.06716v1 Announce Type: new Abstract: The hidden subgroup problem (HSP) unifies many of the best-known quantum speed-ups. For abelian groups it is solved efficiently by weak Fourier sampling, but for non-abelian groups, which…
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Experimental activation of hidden metrological steerability in quantum channels via stochastic filtering
arXiv quant-ph
arXiv:2611.06668v1 Announce Type: new Abstract: Quantum steering-assisted metrology allows a trusted party (Bob) to improve local phase estimation by exploiting classical information communicated by an untrusted party (Alice). In realistic…
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Efficient quantum ultraspherical transform and a well-conditioned quantum spectral method
arXiv quant-ph
arXiv:2611.06651v1 Announce Type: new Abstract: Solving differential equations is a promising application of quantum computing. Spectral methods, where the solution is represented by coefficients in a basis, are particularly well suited to…
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Discovering correlated error mechanisms: data-driven augmentation of detector error models improving decoding
arXiv quant-ph
arXiv:2611.06605v1 Announce Type: new Abstract: Accurate decoder priors are essential for high-performance quantum error correction. Theoretical noise models inevitably omit physically relevant error mechanisms, most notably correlated…
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Universally Certifying Partially Self-Correcting Quantum Memories in 3D Translation-Invariant Stabilizer Codes
arXiv quant-ph
arXiv:2611.06469v1 Announce Type: new Abstract: Achieving passive protection of quantum information at finite temperature is a central problem at the intersection of quantum information and quantum many-body physics. Yet a general…
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Helium States in a CAS(2,2) Subspace Inspired by Quantum Photonics
arXiv quant-ph
arXiv:2611.06448v1 Announce Type: new Abstract: We present a four-mode Fock-state photonics implementation of the variational quantum deflation (VQD) algorithm to calculate the ground-state and excited-state energies for the neutral helium…
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Bridging Pulse and Circuit Levels: A Geometric Framework for Deterministic Error Suppression
arXiv quant-ph
arXiv:2611.06291v1 Announce Type: new Abstract: Quantum errors in noisy environments remain a major obstacle to advancing quantum information technology. Standard quantum error correction requires massive ancillary qubit overhead…
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Classical Clifford+T Sampling without Computing Marginals
arXiv quant-ph
arXiv:2611.06119v1 Announce Type: new Abstract: We introduce a new exact classical sampling algorithm for Clifford+T circuits, called T-by-T sampling. For a circuit with T-count t, it reduces sampling to evaluating 2t amplitudes of…
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Collectively pumped superradiant laser with coherence scaling beyond the standard quantum limit
arXiv quant-ph
arXiv:2611.05976v1 Announce Type: new Abstract: For more than half a century, the standard quantum limit (SQL) was thought to limit the laser coherence $\mathfrak{C}$ -- the number of photons emitted from the laser into the beam in one…
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Norm Bounds on Sums of Positive Operators with Applications to Monogamy Games and Quantum Key Distribution
arXiv quant-ph
arXiv:2611.05943v1 Announce Type: new Abstract: Bounding the acceptance probabilities of quantum measurements is a recurring task in quantum information theory. An acceptance probability averaged over a random measurement setting can be…