Quantum Computing
Quantum Computing news — Tuesday 27 October 2026
150 stories from 3 sources, every one in English. Each links to its publisher.
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QuantrolOx Raises €12 Million ($13.36 Million USD) Series A2 to Scale Automated Quantum Control Software and U.S. Operations
Quantum Computing Report
QuantrolOx has secured €12 million ($13.36 million USD) in Series A2 funding, bringing its total funding to approximately €28 million. The company, which specializes in automated quantum control software, will use the investment to expand…
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GQI Q3 2026 State of Play: Investment Consolidation, Accelerating Q-Day Horizons, and the Shift to Second-Generation Architectures
Quantum Computing Report
Global Quantum Intelligence's Q3 2026 report highlights a quantum technology market in transition, marked by significant capital consolidation and a shift towards second-generation, fault-tolerant hardware architectures. The report also…
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IBM Unveils Meter-Scale Superconducting L-Couplers: Connecting Dual 120-Qubit Processors with 99% State Transfer Fidelity
Quantum Computing Report
IBM Quantum has achieved a significant milestone in quantum computing with the development of meter-scale superconducting L-couplers. These couplers successfully connect two 120-qubit processors with 99% quantum state transfer fidelity…
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IonQ Secures $7.5 Million Phase 2 AFRL Allocation to Expand Rome, NY Quantum Network with Free-Space Optics and Frequency Conversion
Quantum Computing Report
IonQ has received a $7.5 million Phase 2 allocation from the Air Force Research Laboratory (AFRL) to expand its quantum networking in Rome, New York. This phase will focus on connecting different quantum computers using both fiber optics…
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NIST Report Provides Guidelines for Transition to Post-Quantum Cryptography Standards
The Quantum Insider
Insider Brief NIST has released a road map outlining how organizations should replace quantum-vulnerable cryptography with post-quantum standards, including transition timelines and planning considerations. Federal migration targets…
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QuantrolOx Raises €12 Million in Series A2
The Quantum Insider
Insider Brief QuantrolOx raised €12 million in a Series A2 round led by IW Capital, with EIC Fund co-investment, to expand its quantum hardware automation and training business internationally. The company’s three products support quantum…
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Guest Post: The Next Threat to Encryption May Not Need a Quantum Computer
The Quantum Insider
Guest Post by Ofir Joseph, Quantum Communication Researcher, University of Haifa, and Head of the Cybersecurity Program, Academic College of Tel Aviv–Yaffo , Prof. Irit Hadar, Dean, Faculty of Computer and Information Science & Director…
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Quantinuum and GE Vernova Collaborate to Advance High-Temperature Superconductivity Research
The Quantum Insider
Insider Brief Quantinuum and GE Vernova’s Advanced Research Center are collaborating to use quantum computing to study electron behavior associated with high-temperature superconductivity and explore potential energy applications. The…
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Beyond Binary Quantum Computing: Exploring Higher-Dimensional Qudits
The Quantum Insider
Quantum computing is often talked about in terms of qubits, the quantum equivalent of a classical binary bit. But what if the most efficient way to process quantum information is not always binary? At the University of Rochester, Associate…
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OpenAI Computing Claim Faces Review, Raising Questions About Quantum Advantage
The Quantum Insider
Insider Brief OpenAI has enlisted outside researchers to examine an AI-generated proof that it says overturns a longstanding assumption about the difficulty of certain computing problems. The claim could affect some assumptions used to…
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IBM Connects Two 120-Qubit Processors With 99% State-Transfer Fidelity
The Quantum Insider
Insider Brief IBM researchers linked two 120-qubit quantum processors with four superconducting cables, demonstrating connections that could support larger modular quantum computers. The links achieved average quantum state-transfer…
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Higher Order OTOCs in Chaotic Quantum Maps: Ruelle-Pollicott Resonances and Asymptotic Freeness
arXiv quant-ph
arXiv:2610.34615v1 Announce Type: cross Abstract: Out-of-time-ordered correlators (OTOCs) measure the scrambling of information and are a powerful diagnostic of chaos. In chaotic quantum systems with a classical analog, their relaxation…
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QPredSGG: Hybrid Quantum Predicate Learning for Long-Tailed Scene Graph Generation
arXiv quant-ph
arXiv:2606.04689v2 Announce Type: replace Abstract: Scene Graph Generation (SGG) requires relational reasoning over objects and their interactions, but performance is constrained by long-tail predicate imbalance. Classical SGG models rely…
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Quantum Imaging via Kurtosis-Difference Weighted Covariance on 2D Camera
arXiv quant-ph
arXiv:2606.31005v2 Announce Type: replace Abstract: Camera-based quantum imaging detects spatially correlated photon pairs from spontaneous parametric down-conversion (SPDC). Conventional covariance methods typically require tens of…
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Twirled Perfect Tensor Networks: Computationally covariant holographic tensor networks
arXiv quant-ph
arXiv:2605.23670v3 Announce Type: replace-cross Abstract: We define a novel class of tensor networks motivated by the Python's Lunch Conjecture (PLC) in local tensor network models of the black hole interior. We start from the observation…
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The Cost of a Real Grover Oracle: Minecraft Seed Search from Software to Quantum Hardware
arXiv quant-ph
arXiv:2610.33139v1 Announce Type: new Abstract: We present the resource estimation of how known-constant arithmetic changes the cost of a Grover oracle for Minecraft 1.13.1 seed recovery, an application of quantum search to procedural…
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Theory and interpretability of Quantum Extreme Learning Machines: a Pauli transfer matrix approach
arXiv quant-ph
arXiv:2602.18377v4 Announce Type: replace Abstract: Quantum reservoir computers (QRCs) have emerged as a promising approach to quantum machine learning, since they utilize the natural dynamics of quantum systems for data processing and are…
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Semiclassical dynamics of higher-order squeezing: self-adjoint extensions and coherent returns
arXiv quant-ph
arXiv:2610.33378v1 Announce Type: new Abstract: Higher-order squeezing Hamiltonians have several self-adjoint realizations, while their classical trajectories reach infinity in finite time. We relate these extension problems through…
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Measurement-dependent reduction of open dynamics in the quantum phase estimation algorithm: the visible subspace and the damped Fej\'er kernel
arXiv quant-ph
arXiv:2610.35332v1 Announce Type: cross Abstract: For the quantum phase estimation (QPE) algorithm we study the minimal space of observables that is sufficient to predict the entire output distribution under open dynamics of the counting…
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Classical Analog Emulation of Quantum Circuits via Time-Averaged Dynamic States
arXiv quant-ph
arXiv:2601.02977v3 Announce Type: replace Abstract: Between the digital and quantum paradigms lies the emerging field of quantum-inspired analog computing, in which classical waves emulate quantum circuits. We introduce wavebits …
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Topological zero-reflection points in multi-terminal quantum wire junctions
arXiv quant-ph
arXiv:2606.31586v4 Announce Type: replace-cross Abstract: We study scattering in noninteracting multi-terminal quantum wire junctions and show that junctions with dihedral symmetry can exhibit exact zero-reflection points for $N \ge 4$…
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Post-Quantum Perfect Zero-Knowledge Arguments for NP From Any One-Way Permutation
arXiv quant-ph
arXiv:2610.33185v1 Announce Type: new Abstract: In this paper, we show for the first time that post-quantum one-way permutations are sufficient for perfect zero-knowledge classical arguments for all of NP with security guaranteed against…
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Rigorous Lower Bounds for Atomic and Ionic Ground-State Energies
arXiv quant-ph
arXiv:2610.34480v1 Announce Type: cross Abstract: We establish a new iterative method for computing rigorous lower bounds for the ground-state energies of all atoms and ions. The accuracy of the resulting bounds depends on two ingredients…
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Quantum digital simulations of time-domain semiconductor spectroscopy in the semi-classical approximation
arXiv quant-ph
arXiv:2606.04295v2 Announce Type: replace Abstract: We present a digital quantum simulation framework for ultrafast optical spectroscopy of semiconductor materials. The framework is based on Brillouin-zone discretization and is designed as…
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Ramsey Atom Interferometry with Transverse Optical Modes
arXiv quant-ph
arXiv:2606.04430v4 Announce Type: replace-cross Abstract: We experimentally demonstrate atom interferometry using the transverse phase profile of an optical mode. As proof-of-principle, we use the helical phase windings of Hypergeometric…
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Multinomial shot sampling for quantum circuits
arXiv quant-ph
arXiv:2610.35119v1 Announce Type: new Abstract: In classical simulations of quantum circuits, sampling shots (measurement outcomes) from the final state is a routine but costly step. In widely used software, including Qiskit and PennyLane…
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Web of Non-invertible Dualities for (2+1) Dimensional Models with Subsystem Symmetries
arXiv quant-ph
arXiv:2511.18969v2 Announce Type: replace-cross Abstract: We extend non-invertible duality concepts from one-dimensional systems to two spatial dimensions by constructing a web of non-invertible dualities for lattice models with subsystem…
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Frequency-matching quantum key distribution
arXiv quant-ph
arXiv:2512.05496v3 Announce Type: replace Abstract: Quantum key distribution (QKD) enables information-theoretically secure communication against eavesdropping. However, phase instability remains a challenge across many QKD applications…
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Operational boundaries, threshold conditions, and self-quenching in single-emitter microcavity lasers
arXiv quant-ph
arXiv:2606.31239v2 Announce Type: replace Abstract: We theoretically examine the emission dynamics of a three-level cascade single-emitter microcavity laser using the open-system Lindblad master equation. In our numerical simulations, we…
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Initial-State Preparation for Strongly Correlated Molecules from Matrix Product States: Benchmarking and Environment-Aware Divide-and-Conquer Compilation
arXiv quant-ph
arXiv:2610.33834v1 Announce Type: new Abstract: Compiling classically optimized matrix product states (MPSs) into quantum circuits is a promising route to initial-state preparation for strongly correlated molecules, but the accuracy, gate…
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Minimal ancilla for boosting type-I photonic fusion
arXiv quant-ph
arXiv:2610.34257v1 Announce Type: new Abstract: Fusion gates enable the creation of large entangled photonic states for linear-optical quantum computing and communication protocols. However, their success probability is limited to $1/2$…
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Neural Information Causality: A Random-Access Capacity Law for Representation Learning
arXiv quant-ph
arXiv:2605.09316v2 Announce Type: replace Abstract: How can a learned representation remain useful when the question it must answer is chosen only after encoding? Preserving information is essential, but does not by itself ensure access to…
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Colloquium: Nuclear clocks
arXiv quant-ph
arXiv:2606.11048v2 Announce Type: replace-cross Abstract: The Th-229 nuclear isomeric state has the lowest energy of all known nuclear excited states, placing it within the reach of current table-top laser technology. This extraordinary…
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Bounding the entanglement of a state from its spectrum
arXiv quant-ph
arXiv:2604.02420v3 Announce Type: replace Abstract: We introduce a framework to upper bound the entanglement content of a bipartite quantum state from its spectrum alone. Using linear maps and their inverses, we derive rigorous constraints…
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Homomorphic Quantum Error Correction
arXiv quant-ph
arXiv:2605.25692v2 Announce Type: replace Abstract: We study the algebraic compatibility between quantum homomorphic encryption and stabilizer quantum error correction in an honest-but-curious model, restricting the encryption to the…
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A new analytical finding for the Born-Infeld integral potential
arXiv quant-ph
arXiv:2610.33326v1 Announce Type: new Abstract: A new finding regarding the Born-Infeld potential for short range distances from the charge revealed that its integral form can be almost exact written as the difference between a…
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Path integral control in the complex plane
arXiv quant-ph
arXiv:2610.34483v1 Announce Type: new Abstract: Path integral control is a stochastic optimal control framework that computes optimal policies as weighted averages over state trajectories. It was recently shown that, combined with…
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Path-Distinguishability Gaps at Fixed Visibility in Noisy Qubit Interferometers
arXiv quant-ph
arXiv:2610.33632v1 Announce Type: new Abstract: The wave--particle duality relation bounds visibility and path distinguishability but does not determine their attainable values in a fixed noisy interferometer. We characterize the complete…
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New bound on $S_{1}\times S_{2}$-setting Bell locality of a nonseparable Werner state
arXiv quant-ph
arXiv:2607.18050v3 Announce Type: replace Abstract: In many quantum applications it is important to know whether or not a Bell nonlocal two-qudit state exhibits its nonlocality under correlation scenarios with some given numbers…
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Conditional Motional Squeezing of an Optomechanical Oscillator Approaching the Quantum Regime
arXiv quant-ph
arXiv:2410.09208v3 Announce Type: replace Abstract: Squeezed mechanical states are a highly coveted resource for quantum-enhanced sensing and serve as a compelling platform for probing the interplay between gravity and quantum mechanics…
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Competing coherence geometries in positive maps: positivity hierarchies, atomicity, and optimal entanglement witnesses
arXiv quant-ph
arXiv:2610.35758v1 Announce Type: new Abstract: We introduce a family of positive maps on qudits whose Choi operators combine two competing coherence patterns: independent exchange couplings and a collective set of diagonal couplings. For…
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Large Language Models for Quantum Code Translation: An Exploratory Study
arXiv quant-ph
arXiv:2610.34841v1 Announce Type: cross Abstract: Quantum software development is challenged by quantum-mechanical semantics and fragmented software development kits (SDKs), which complicate cross-SDK code translation and execution. In…
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A general quantum circuit framework for Extended Wigner's Friend Scenarios: logically and causally consistent reasoning without absolute measurement events
arXiv quant-ph
arXiv:2209.09281v3 Announce Type: replace Abstract: Extended Wigner's Friend Scenarios (EWFSs) model agents themselves as unitarily evolving quantum systems, going beyond the standard use of quantum theory where agents are treated…
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Universal two-excitation scattering in two-dimensional subwavelength atomic arrays
arXiv quant-ph
arXiv:2509.17085v2 Announce Type: replace Abstract: Subwavelength atomic arrays are a leading platform for engineering strong light-matter interactions, presenting exciting opportunities for quantum science. However, a full understanding…
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Accuracy, Decision Risk, and Sampling Cost in Quantum Error Mitigation
arXiv quant-ph
arXiv:2607.02888v2 Announce Type: replace Abstract: Quantum error mitigation estimates expectation values that are often used to select or rank candidates. We study how estimation accuracy, decision risk and sampling cost are related in…
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Quantum circuit synthesis for fermionic excitations in coupled cluster theory
arXiv quant-ph
arXiv:2601.07890v4 Announce Type: replace Abstract: This work provides a step-by-step quantum computing derivation of the unitary coupled cluster singles and doubles ansatz. We show how the structure of the ansatz emerges from fermionic…
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When is a bosonic operator a Hamiltonian?
arXiv quant-ph
arXiv:2610.33545v1 Announce Type: new Abstract: Hermitian polynomials in the quadrature operators $x$ and $p$ are the basic ingredients of continuous-variable quantum information, and increasingly exotic ones are now routinely engineered…
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A semi-classical analysis of the coupling strength $\gamma$ between motional quantum states of spatially distant trapped ions interacting via a conducting wire
arXiv quant-ph
arXiv:2111.14957v2 Announce Type: replace Abstract: Interfacing ion qubits in separate traps is among the challenges towards scaling up trapped ion quantum computing. This theoretical study focuses on using a conducting wire to couple the…
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Quantum measurement retrodiction and entropic uncertainty relations
arXiv quant-ph
arXiv:2511.20281v3 Announce Type: replace Abstract: We study quantum measurement retrodiction using the principle of minimum change. For quantum-to-classical measurement channels, we show that all standard quantum divergences select the…
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PPT-assisted capacities of bosonic Gaussian channels
arXiv quant-ph
arXiv:2610.26783v2 Announce Type: replace Abstract: We determine the exact quantum communication and entanglement-distribution capacities of three fundamental bosonic channels, namely thermal loss, thermal amplification and additive…
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Quantum-Relativistic Anomalous Proper Time
arXiv quant-ph
arXiv:2610.33220v1 Announce Type: new Abstract: We investigate surprising consequences of the hypothesis that gravity and proper time obey the quantum superposition principle. We show that, for a massive body prepared in a superposition of…
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Multimode continuous-variable quantum key distribution with CMOS-compatible photonic-electronic integration
arXiv quant-ph
arXiv:2610.35410v1 Announce Type: new Abstract: Multiplexing and photonic-electronic integration offer a route to scalable and high-throughput quantum key distribution (QKD) networks through parallel transmission and compact hardware…
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Robustness Evaluation of Hybrid Quantum Neural Networks under Noise Models via System-Level Error Mitigation
arXiv quant-ph
arXiv:2604.17515v3 Announce Type: replace Abstract: Quantum Neural Networks (QNNs) represent a promising direction within Quantum Machine Learning (QML), yet their realization on noisy intermediate-scale quantum (NISQ) devices remains…
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Krylov geometry and optimal recovery under uncertain coherent noise
arXiv quant-ph
arXiv:2610.33607v1 Announce Type: new Abstract: Recovery from a coherent rotation with an unobserved angle depends on both the encoding and what calibration reveals about the noise. We determine their combined limit for a known…
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Exact operator bounds on Leggett-Garg violations
arXiv quant-ph
arXiv:2610.33429v1 Announce Type: new Abstract: Leggett-Garg (LG) inequalities test whether correlations measured at different times admit a positive joint probability distribution over histories. A violation requires negative values in…
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Quantum Heuristic Separation of Comb Inequalities for the Travelling Salesman Problem
arXiv quant-ph
arXiv:2610.33188v1 Announce Type: new Abstract: Comb inequalities are essential cutting planes for the travelling salesman problem, yet their separation remains computationally challenging. We propose a quantum heuristic separation…
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Charge-Coupled Device-Based Arbitrary Waveform Generation for Qubit Control
arXiv quant-ph
arXiv:2610.34988v1 Announce Type: new Abstract: We propose an arbitrary waveform generation architecture based on charge-coupled devices (CCDs) for qubit control. Waveform samples are stored as charge packets in CCD channels and…
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Dephasing-powered open quantum-dot battery
arXiv quant-ph
arXiv:2610.33408v1 Announce Type: cross Abstract: We propose a simple realization of an open quantum battery powered by local dephasing. The setup consists of a triple-quantum-dot chain coupled at one end to a thermal reservoir, with the…
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Admissible Subspaces for the Collective Haar Twirl: Schur-Weyl Classification and Heredity under Tensor-Factor Reduction
arXiv quant-ph
arXiv:2610.33553v1 Announce Type: cross Abstract: Quantum private broadcasting (\textsf{QPB}) asks whether a quantum message can be encrypted once, broadcast to several recipients, and decrypted locally while the joint ciphertext reveals…
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Nonclassicality of a Macroscopic Qubit-Ensemble via Parity Measurement Induced Disturbance
arXiv quant-ph
arXiv:2511.15880v2 Announce Type: replace Abstract: We propose an experimental scheme to test the nonclassicality of a macroscopic ensemble of qubits, through the violation of the classical notion of macrorealism (MR) via the fundamental…
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Two exact quantum queries use at most six variables
arXiv quant-ph
arXiv:2610.34079v1 Announce Type: new Abstract: We give a direct analytic proof that every total Boolean function computable exactly with at most two quantum queries depends on at most six input variables. This bound is sharp. A previous…
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Parity-selected charging and noise-correlated work retention in a coupled Si/SiGe double quantum dot battery: theory and experimentally parameterized modeling
arXiv quant-ph
arXiv:2606.28082v2 Announce Type: replace-cross Abstract: We investigate extractable work storage in a capacitively coupled double quantum dot (DQD) quantum battery (QB) subjected to experimentally motivated detuning charge noise. The…
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PauLIB: HPC Strategies for Pauli-Arithmetic-Based Quantum Computing Workloads and Simulations
arXiv quant-ph
arXiv:2605.25974v2 Announce Type: replace Abstract: As quantum devices become accelerators within classical HPC deployments, the efficiency of the classical partition becomes critical. Workloads such as Hamiltonian manipulation, observable…
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Did the Gran Sasso Experiment Rule Out the Di\'osi-Penrose Theory? Musing on the 2021 Result and the Present Experimental Status
arXiv quant-ph
arXiv:2610.35608v1 Announce Type: new Abstract: In 2021, a low-background experiment at the Gran Sasso National Laboratory searched for spontaneous radiation predicted by the standard Markovian Di\'osi-Penrose (DP) dynamics and obtained…
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Proofs of Quantum Memory
arXiv quant-ph
arXiv:2510.04159v2 Announce Type: replace Abstract: In this paper, we introduce a new concept, proofs of quantum memory (PoQM). A PoQM is an interactive protocol between a classical verifier and a quantum prover over a classical channel…
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A Control Line Multiplexing Framework for Scalable Quantum Computing
arXiv quant-ph
arXiv:2610.35227v1 Announce Type: new Abstract: Universal fault-tolerant superconducting quantum computers are expected to require millions of physical qubits; yet extending the prevailing dedicated-control-line paradigm to this scale…
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Boundary-condition independence of infinite-chain ground states in the $S=1$ $J$-$D$ antiferromagnetic chain
arXiv quant-ph
arXiv:2610.34330v1 Announce Type: cross Abstract: Extending the analytic machinery and using the numerical inputs from OpenAI's proofs of the Haldane gap, we study infinite-chain ground states of the $S=1$ $J$-$D$ antiferromagnetic model…
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A Simple Necessary and Sufficient Condition for Yang--Baxter Integrability
arXiv quant-ph
arXiv:2607.29660v2 Announce Type: replace-cross Abstract: Quantum integrability is a cornerstone of the exact theory of interacting quantum spin chains. In its standard formulation, however, one starts from R-matrices satisfying the…
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Network nonlocality with tripartite entangled sources
arXiv quant-ph
arXiv:2610.35838v1 Announce Type: new Abstract: Quantum networks are built from independent sources, and their nonlocality has mostly been studied with sources that emit bipartite entangled states. A source of three entangled qubits is…
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Compressing multivariate functions with tree tensor networks
arXiv quant-ph
arXiv:2410.03572v5 Announce Type: replace Abstract: Tensor networks are a compressed format for multi-dimensional data. One dimensional tensor networks -- often referred to as tensor trains (TT) or matrix product states (MPS) -- are…
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Randomized Subsystem Descent for Fermion-to-Qubit Mapping
arXiv quant-ph
arXiv:2604.17630v2 Announce Type: replace Abstract: We propose a versatile and efficient algorithmic framework for optimizing fermion-to-qubit mappings by generalizing the idea of randomized block coordinate descent. Our greedy approach…
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Feasibility of Distributed Fault-Tolerant Quantum Computing: From Quantum Links to Algorithms
arXiv quant-ph
arXiv:2610.34143v1 Announce Type: new Abstract: Practical fault-tolerant quantum computation requires a large number of physical qubits, posing a major challenge for scaling up individual quantum processors. Distributed architectures offer…
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Benchmarking quantum-annealing-based approaches for factory layout planning
arXiv quant-ph
arXiv:2610.35478v1 Announce Type: new Abstract: The earlystage of factory layout planning has a direct effect on the operating costs, efficiency, and productivity of manufacturing systems. Conventional automated planning approaches often…
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Real-Space Interference from Quantum Metric
arXiv quant-ph
arXiv:2610.14048v2 Announce Type: replace-cross Abstract: Real-space interference of wave packets is governed by their central momentum separation and momentum width, which set the oscillation wavelength and spatial envelope, respectively…
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Quantifying entanglement in quantum thermodynamics via separability constraints
arXiv quant-ph
arXiv:2603.17078v3 Announce Type: replace Abstract: The role of quantum entanglement in thermodynamical systems remains elusive. Does entanglement result in thermodynamic advantages or does it impose fundamental limitations? Here, we…
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Decoherence of a quantum magneto-oscillator: Effect of field-bath interaction
arXiv quant-ph
arXiv:2607.11137v2 Announce Type: replace Abstract: We investigate the quantum dissipative dynamics of a charged magneto-oscillator(CMO) coupled to a heat bath of harmonic oscillators in the presence of an additional field-bath…
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Inherent interpretability provides inherent value in quantum machine learning
arXiv quant-ph
arXiv:2607.13827v4 Announce Type: replace Abstract: The field of quantum machine learning (QML) evolved to value models believed to most directly rival those providing utility in classical ML, namely large-scale neural networks. This…
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Rabi oscillations induced by nonresonant gyrating drive
arXiv quant-ph
arXiv:2602.11979v2 Announce Type: replace-cross Abstract: Coherent control of two-level quantum systems is typically achieved using resonant driving fields, forming the basis for qubit operations. Here, we report a mechanism for inducing…
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Experimental probe of quantum coherence in top-quark pair production at the LHC
arXiv quant-ph
arXiv:2602.21069v3 Announce Type: replace-cross Abstract: We investigate quantum coherence in the spin degrees of freedom of top--antitop pairs produced at the LHC using the $l_1$-norm of coherence in the helicity basis. Combining Standard…
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Quantum Reference Fields Transformations in Linearized Quantum Gravity
arXiv quant-ph
arXiv:2606.09344v2 Announce Type: replace-cross Abstract: Diffeomorphism invariance is a central feature of general relativity. Without external reference structures, matter and geometry must be specified relationally, with respect to…
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Decision-aware validation of zero-noise extrapolation in QAOA optimization landscapes
arXiv quant-ph
arXiv:2610.33386v1 Announce Type: new Abstract: Zero-noise extrapolation (ZNE) is usually validated by the accuracy of mitigated observables, yet variational quantum optimization uses those observables to select parameters. We ask whether…
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The Coherent State Projection Eigenvalue Theorem
arXiv quant-ph
arXiv:2610.33613v1 Announce Type: new Abstract: Recent papers have developed a cyclic symmetry projected extension for coherent state representations of bosonic Hilbert space. This extension can greatly reduce sampling errors in…
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QQLink: A Declarative Framework for Multi-QPU Quantum Workflow Orchestration
arXiv quant-ph
arXiv:2610.34486v1 Announce Type: new Abstract: Distributed quantum protocols require measurement outcomes produced at one node to control operations at another. We present QQLink, a programming and orchestration layer that expresses these…
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Quantum Anomaly Detection in network traffic using Variational Quantum Classifiers
arXiv quant-ph
arXiv:2610.34635v1 Announce Type: new Abstract: The increasingly complex cybersecurity landscape requires more advanced network anomaly detection systems. Although, classical machine learning models are known to be effective, they reach…
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Comparing classical and quantum QUBO solvers: optimality, trajectory diagnostics, and limits of solver selection
arXiv quant-ph
arXiv:2610.35126v1 Announce Type: new Abstract: Comparing solvers for quadratic unconstrained binary optimization (QUBO) requires distinguishing solution quality from optimality certification. We compare classical, tensor-network, and…
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Quantum-Classical Framework for the Joint Optimization of Bidirectional EV Charging and Trip Assignment
arXiv quant-ph
arXiv:2610.35300v1 Announce Type: new Abstract: The integration of bidirectional (V2G) charging allows electric vehicle (EV) fleets to operate as distributed energy assets. However, the joint optimization of charging schedules and trip…
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Bell-pair distillation under imperfect operations
arXiv quant-ph
arXiv:2610.35699v1 Announce Type: new Abstract: We recently proposed an entanglement distillation protocol based on local operations and classical communication that probabilistically and universally distills a maximally entangled Bell…
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On the Increase of Boltzmann Entropy in Closed Macroscopic Quantum Systems
arXiv quant-ph
arXiv:2610.18553v2 Announce Type: replace Abstract: We consider a closed macroscopic quantum system in a pure state $\psi$ evolving unitarily with Hamiltonian $H$ in a finite-dimensional Hilbert space $\mathscr{H}$. Following von Neumann…
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Landscape of scattering universality with general dispersion relations
arXiv quant-ph
arXiv:2509.01782v3 Announce Type: replace-cross Abstract: Universality in physics describes how disparate systems can exhibit identical low-energy behavior. Here, we reveal a rich landscape of new universal scattering phenomena governed by…
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AlphaCNOT: Learning CNOT Minimization with Model-Based Planning
arXiv quant-ph
arXiv:2604.13812v2 Announce Type: replace-cross Abstract: Quantum circuit optimization is a central task in quantum computing, as current NISQ devices suffer from error propagation that often scales with the number of operations. Among…
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A New Non-Affine Family in the Karlsson-Szollosi Intersection
arXiv quant-ph
arXiv:2610.33207v1 Announce Type: new Abstract: We show that $K_6^{(2)} \cap X_6^{(2)} = D_6^{(1)} \cup C_6^{(1)}$ up to standard Hadamard equivalence, where $C_6^{(1)}$ is a new non-affine one-parameter family of complex Hadamard…
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Naive Quantum Gravity
arXiv quant-ph
arXiv:1502.02058v4 Announce Type: replace-cross Abstract: A possible alternative route to a quantum theory of gravity is described. The usual path quantises the gravitational field in order to introduce the statistical structure…
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A Reduction Bound for Entanglement Detection by Positive Free Maps
arXiv quant-ph
arXiv:2610.34338v1 Announce Type: new Abstract: Collins, Hayden, and Nechita used free probability to construct families of $k$-positive but not $(k+1)$-positive maps and applied them to entanglement detection. We prove that positive free…
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Distributed quantum approximate counting algorithm
arXiv quant-ph
arXiv:2511.04945v2 Announce Type: replace Abstract: In this article, we propose a distributed quantum algorithm for solving counting problem using Grover operator and a classical post-processing procedure. We apply the proposed algorithm…
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Explicit complex time integrators for stiff problems
arXiv quant-ph
arXiv:2601.07730v2 Announce Type: replace-cross Abstract: Most numerical methods for time integration use real-valued time steps. Complex time steps, however, can provide an additional degree of freedom, as we can select the magnitude of…
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Twirled and swirled worlds: a compositional approach
arXiv quant-ph
arXiv:2610.33294v1 Announce Type: new Abstract: Twirled and swirled worlds describe generalised probabilistic theories (GPTs) restricted by symmetry-imposed superselection rules. We extend these constructions to a fully compositional…
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Bosonic Loss Codes with Bounded Occupation
arXiv quant-ph
arXiv:2610.34411v1 Announce Type: new Abstract: We study Fock-state codes on $q$ bosonic modes, with total excitation $N$ and at most $B$ excitations per mode, that exactly correct every pattern of at most $\delta N$ photon losses, for $q$…
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Self-Correcting 3D Surface Code with Growing Local Dimension
arXiv quant-ph
arXiv:2610.35099v1 Announce Type: new Abstract: We construct self-correcting 3D surface codes over $\mathbb Z_q$ with local dimension $q$ growing with system size. The model preserves the local geometry and stabilizer support of the…
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Distillable entanglement is continuous
arXiv quant-ph
arXiv:2610.35722v1 Announce Type: new Abstract: We prove continuity of distillable entanglement, the optimal asymptotic rate at which copies of a bipartite state can be converted into maximally entangled pairs by local operations and…
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Zeptojoule Microwave Calorimetry with Nanosecond Recovery in Graphene
arXiv quant-ph
arXiv:2610.33414v1 Announce Type: cross Abstract: Graphene calorimeters are predicted to combine extreme energy sensitivity with rapid thermal recovery, yet experiments remain far from ideal estimates. Here, we directly calibrate a…
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Symmetry-resolved quasilocal entanglement as a key to Mott and pseudogap physics in plaquette CDMFT
arXiv quant-ph
arXiv:2610.34470v1 Announce Type: cross Abstract: In order to identify intrinsic quantum resources in strongly interacting fermionic systems, we introduce a symmetry resolution of the parity-superselected two-site entanglement, as measured…
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One-sided Witnesses for the Quantumness of Gravitational Dynamics
arXiv quant-ph
arXiv:2507.15588v2 Announce Type: replace Abstract: Quantum information concepts and quantum technologies have opened the prospect of probing the quantum nature of gravity in table-top experiments. Most proposals rely on detecting…
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Tensor Decomposition for Non-Clifford Gate Minimization
arXiv quant-ph
arXiv:2602.15285v2 Announce Type: replace Abstract: Fault-tolerant quantum computation requires substantial resources for non-Clifford gates. Their count also enters exponentially into the runtime of several classical simulation methods…
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Two-qubit binegativity can increase under local amplitude damping
arXiv quant-ph
arXiv:2610.34322v1 Announce Type: new Abstract: It has been conjectured that the binegativity of two-qubit states is an entanglement monotone. We present a full-rank state as a counterexample: applying amplitude damping to only one of the…
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Real-Time Correlation of Relaxation, Dephasing, and Two-level System Dynamics in Transmon Qubits
arXiv quant-ph
arXiv:2610.34485v1 Announce Type: new Abstract: Materials improvements in transmon qubits have yielded remarkable advances in qubit lifetimes (T1)and coherence times (T2). However, state-of-the-art superconducting qubits experience…
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Complete characterization of internal-external entanglement trade-offs in two-mode Gaussian states
arXiv quant-ph
arXiv:2610.35183v1 Announce Type: new Abstract: We characterize the exact trade-off between internal and external entanglement in asymmetric two-mode Gaussian states at fixed local symplectic eigenvalues. Internal entanglement is…
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Multistability and Critical Frustrated Superradiance in Open Anisotropic Quantum Rabi Trimer
arXiv quant-ph
arXiv:2610.35445v1 Announce Type: new Abstract: We study the nonequilibrium steady states of an open anisotropic quantum Rabi trimer. Combining semiclassical and quantum mechanical treatments, we map out the system's phase diagram and…
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On the Energy Minimizing Problem in Plasma Dynamics
arXiv quant-ph
arXiv:2610.33040v1 Announce Type: cross Abstract: A fundamental question in plasma physics and its applications to fusion theory is to find minimum energy stares of plasma.. Hong Qin has suggested the use of what he calls "Gromov ground…
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Photometric Redshift Estimation with Hybrid Quantum Neural Network
arXiv quant-ph
arXiv:2610.35196v1 Announce Type: cross Abstract: A Hybrid Quantum Neural Network (HQNN) is applied to recover the photometric redshift of a galaxy dataset built using data from two astronomical surveys, the Kilo-Degree Survey (KIDS) and…
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Simon's Period Finding on a Quantum Annealer
arXiv quant-ph
arXiv:2504.10771v2 Announce Type: replace Abstract: Dating to 1994, Simon's period-finding algorithm is among the earliest and most fragile of quantum algorithms. The algorithm's fragility arises from the requirement that, to solve an n…
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Control of Multipartite Entanglement through Anisotropy against Thermal Noise
arXiv quant-ph
arXiv:2602.22815v3 Announce Type: replace Abstract: Preserving multipartite entanglement in open many-body quantum systems is fundamentally limited by unavoidable environmental noise. We study the open-system dynamics of multipartite…
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Low Depth Distributed Quantum Algorithms for Unordered Database Search
arXiv quant-ph
arXiv:2604.14081v2 Announce Type: replace Abstract: Grover's algorithm accelerates unstructured database search quadratically compared to classical algorithms. In the NISQ era, distributed quantum computing can decrease circuit depth and…
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Hidden Fisher Information in Many-Body Quantum Sensors
arXiv quant-ph
arXiv:2610.33893v1 Announce Type: new Abstract: Quantum Fisher information (QFI) determines the ultimate precision of a quantum sensor after optimization over all allowed measurements, but it does not quantify how difficult the optimal…
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Quantum neuroplastic learning for time-series processing
arXiv quant-ph
arXiv:2610.34055v1 Announce Type: new Abstract: Quantum machine learning uses quantum states and dynamics to represent and process data. In quantum reservoir computing, the physical system is typically fixed and a classical readout is…
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Pauli-ball discrepancy and stability of quantum codes
arXiv quant-ph
arXiv:2610.34399v1 Announce Type: new Abstract: The Pauli-ball discrepancy, a quadratic discrepancy summed over all error radii, measures how uniformly the Pauli error images of a $K$-dimensional quantum code cover the $d$-dimensional…
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Quantum ordinal selection with two comparisons
arXiv quant-ph
arXiv:2610.34762v1 Announce Type: new Abstract: We study the optimal probability of selecting an object within a prescribed rank threshold using at most two noiseless coherent pairwise comparisons of an unknown strict order. Polynomial…
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Quantum state revivals, time quasicrystals, and entanglement steering in a Fibonacci-driven central-spin model
arXiv quant-ph
arXiv:2610.35555v1 Announce Type: new Abstract: Motivated by the search for non-equilibrium phases of matter beyond the Floquet paradigm, we propose a route to realize perfect revivals and time quasicrystals (TQCs) in a Fibonacci-driven…
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How Retrocausality Helps
arXiv quant-ph
arXiv:1706.02290v2 Announce Type: replace Abstract: It has become increasingly apparent that a number of perplexing issues associated with the interpretation of quantum mechanics are more easily resolved once the notion of retrocausality…
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Induced Bell-CHSH observables in the Fewster-Verch measurement scheme
arXiv quant-ph
arXiv:2610.33773v1 Announce Type: new Abstract: The Summers-Werner theorem shows that the vacuum of a relativistic quantum field theory violates the Bell-CHSH inequality maximally on complementary wedges, but it is an existence statement…
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Basis-set error bounds for first-quantised quantum simulation of chemistry
arXiv quant-ph
arXiv:2610.35205v1 Announce Type: new Abstract: In quantum simulation of electronic structure it is often expected that the estimate of the ground energy converges to the continuum basis limit at a rate of $\mathcal O(N^{-1})$ for a basis…
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The $\varepsilon$-smoothed Entanglement of Formation and its relation to the Moreau-Yosida approximation
arXiv quant-ph
arXiv:2610.35797v1 Announce Type: new Abstract: We describe a family of convex continuous functions $E_{F,\varepsilon}$, $\varepsilon\in(0,1]$, on the set of states of a bipartite quantum system (consisting of finite-dimensional or…
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Complete entropy contraction from conditional hyperboundedness
arXiv quant-ph
arXiv:2610.35863v1 Announce Type: new Abstract: For finite-dimensional quantum channels compatible with a faithful conditional expectation, we show that conditional hyperboundedness and strict GNS contraction together yield a relative…
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Banach-Cesaro positive operator-valued measure
arXiv quant-ph
arXiv:2610.33821v1 Announce Type: cross Abstract: We construct a family of bounded, finitely additive, covariant positive operator-valued measures (POVMs) on the real line by applying generalised Banach-Cesaro asymptotic averaging to…
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Bargmann-invariant witness of the graviton commutator
arXiv quant-ph
arXiv:2610.35253v1 Announce Type: cross Abstract: We identify the phase of a Bargmann invariant of two matter-wave interferometers as a quantum gravity signature that cannot be reproduced by any branchwise-definite classical gravitational…
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Geometric Complexity of Quantum Channels via Unitary Dilations
arXiv quant-ph
arXiv:2601.00735v2 Announce Type: replace Abstract: Nielsen's geometric approach to quantum circuit complexity provides a Riemannian framework for quantifying the cost of implementing unitary closed-system dynamics. For open evolutions…
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Measurements on the separated subsystems of an entangled state
arXiv quant-ph
arXiv:2609.04178v3 Announce Type: replace Abstract: The entangled states of composite quantum systems are well studied. The particle-like nature of these systems also means that, while entangled, they can be physically separated and…
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Breakdown of thermalization in quantum spin systems with long-range interactions
arXiv quant-ph
arXiv:2610.15530v2 Announce Type: replace Abstract: Quantum thermalization of closed systems -- i.e. the relaxation of local properties to their thermodynamic value along the Hamiltonian evolution -- is generically expected in…
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Ancilla-free optimal quantum adder
arXiv quant-ph
arXiv:2610.34446v1 Announce Type: new Abstract: We construct an exact $n$-bit quantum adder with $O(n)$ gates and $O(\log n)$ depth that requires no ancillary qubits. The circuit uses only $X$, CNOT, and Toffoli gates under all-to-all…
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Model-Uncertainty-Aware Digital Twins for Non-Markovian Quantum Repeater Memories
arXiv quant-ph
arXiv:2610.34506v1 Announce Type: new Abstract: Quantum-repeater controllers need reliable estimates of stored entanglement as adjacent links are generated. Fixed exponential lifetimes miss non-Markovian revivals, while complex surrogates…
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Emergent Recursive Kernels in Quantum Reservoir Computing
arXiv quant-ph
arXiv:2610.34430v1 Announce Type: new Abstract: Learning with a quantum reservoir can be far simpler than simulating its dynamics. We show that a quantum reservoir governed by a fixed evolution, consisting of an input coupling followed by…
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Fast and accurate rare-event simulation by Markov chain Monte Carlo for general quantum codes
arXiv quant-ph
arXiv:2610.35498v1 Announce Type: new Abstract: The splitting method estimates logical error rates of quantum error-correcting codes deep in the rare-event regime, where direct Monte Carlo sampling is prohibitively expensive. It relies on…
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Quantum computation of energy level degeneracy and thermodynamical properties of spin systems
arXiv quant-ph
arXiv:2610.35660v1 Announce Type: new Abstract: We propose a hybrid quantum-classical method for reconstructing energy-level degeneracies and thermodynamic properties of spin systems. A single ancilla qubit is used to measure the partition…
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Parametrically Enhanced Ergotropy and Charging Power in a Three-Mode Bosonic Quantum Battery
arXiv quant-ph
arXiv:2610.35734v1 Announce Type: new Abstract: Quantum batteries are quantum systems that potentially serve as fuel for other quantum devices by receiving and supplying energy. In this work, we propose a theoretical scheme to enhance…
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Twist-controlled imaginary-time Mpemba effect in quantum spin systems
arXiv quant-ph
arXiv:2610.35784v1 Announce Type: new Abstract: We construct a controllable imaginary-time Mpemba effect in quantum spin systems using spatially modulated local rotations without changing initial bipartite entanglement spectra and…
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Deep-Microscopic Photonic Bandstructure of a Two-Dimensional Honeycomb Lattice
arXiv quant-ph
arXiv:2610.33709v1 Announce Type: cross Abstract: Conventional descriptions of light in materials rely on macroscopic models that average the optical response over the microscopic lattice structures. These models are deployed in the…
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Subsystem self-correction of the GKP qubit
arXiv quant-ph
arXiv:2609.07702v2 Announce Type: replace Abstract: Passive quantum error correction, also known as self-correction, is a holy grail in quantum information science. Recent theoretical advances suggest that the Gottesman-Kitaev-Preskill…
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Fully quantum training of parametric circuits with Quantum Hamiltonian Descent
arXiv quant-ph
arXiv:2610.33144v1 Announce Type: new Abstract: Parametric quantum circuits are usually trained by classical, local optimizers, which use the quantum computer only to evaluate the cost function, or its gradient, one point at a time…
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Observation of measurement-induced localization phenomena in a solid-state spin system
arXiv quant-ph
arXiv:2610.34262v1 Announce Type: new Abstract: Quantum measurement can profoundly impact the dynamics of many-body systems, for instance, inducing phase transitions from volume-law chaotic phases to area-law localized phases. While…
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Target Detection with Asymmetric Gaussian Classical Correlation
arXiv quant-ph
arXiv:2610.34698v1 Announce Type: new Abstract: We study the characteristics of two-mode classical correlation in Gaussian regime, which is produced by impinging a thermal state into a beam splitter. It is explicitly investigated how a…
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Quantum-enhanced metrology with classical shadows
arXiv quant-ph
arXiv:2610.35632v1 Announce Type: new Abstract: Quantum metrology relies on observables that maximize information about the parameter of interest, but are often hard to access. We develop a protocol that combines Pauli moments estimated…
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Controlling transport with structured long-range hopping
arXiv quant-ph
arXiv:2610.33393v1 Announce Type: cross Abstract: The combined effects of disorder and long-range hopping play an important role in determining localization and transport in low-dimensional quantum systems. We study transport in a…
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Certified bounds on optimization problems in quantum theory
arXiv quant-ph
arXiv:2512.17713v2 Announce Type: replace Abstract: Semidefinite relaxations of polynomial optimization have become a central tool for addressing the non-convex optimization problems over non-commutative operators that are ubiquitous in…
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On the Redfield and Lindblad master equations
arXiv quant-ph
arXiv:2602.13429v2 Announce Type: replace Abstract: In a previous work we developed a field theoretical approach to open quantum systems using condensed matter methods. In the Born approximation we derived the Redfield equation on the…
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Unveiling Topological Fusion in Quantum Hall Systems from Microscopic Principles
arXiv quant-ph
arXiv:2604.16525v3 Announce Type: replace-cross Abstract: Establishing the fusion rules of anyonic quasiparticles in fractional quantum Hall fluids is essential for understanding their underlying topological order. Building on the…
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Measure of set coherence
arXiv quant-ph
arXiv:2610.34784v1 Announce Type: new Abstract: Set coherence is a quantum resource for a set of states that characterizes whether a collection of quantum states contains coherence, namely whether these states fail to be simultaneously…
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Heisenberg-Scaling Quantum Metrology of Electron-Photon Coupling via Multi-Electron PINEM
arXiv quant-ph
arXiv:2610.34919v1 Announce Type: new Abstract: Free-electron quantum optics has recently emerged as a promising platform for coherent electron-light interactions, yet its potential for quantum-enhanced metrology remains largely…
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Decoding with alternating weighted graph sparsification for quantum low-density parity-check codes
arXiv quant-ph
arXiv:2610.35735v1 Announce Type: new Abstract: Real-time decoding is a fundamental necessity for building fault-tolerant quantum computers. In this work, we introduce decoding with alternating weighted graph sparsification (DAWG), an…
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Communication Complexity of Integer Matrix Singularity
arXiv quant-ph
arXiv:2610.33521v1 Announce Type: cross Abstract: Alice and Bob hold complementary halves of the columns of an $n\times n$ matrix of $k$-bit integers and decide whether it is singular over $\mathbb Q$. Up to constant-factor dimension…
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Helicity-Selective Electron-Phonon Coupling Between $PT$-Partner States in $2H$-bilayer MoS$_2$
arXiv quant-ph
arXiv:2610.34830v1 Announce Type: cross Abstract: Rotational symmetry ($C_n$) constrains chiral phonons, but how other symmetries affect their interactions remains largely unexplored. We perform a theoretical and computational study of…
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Designing Quantum Solutions to the Closest String Problem with the Non-Variational QWOA
arXiv quant-ph
arXiv:2610.33532v1 Announce Type: new Abstract: Quantum computing offers promising approaches to combinatorial optimization problems whose search spaces grow exponentially with problem size. The Closest String problem belongs to this…