Quantum Computing
Quantum Computing news — Friday 06 November 2026
150 stories from 3 sources, every one in English. Each links to its publisher.
-
NQCC Signs Enterprise Agreement with Phasecraft to Provide Quantum Software via SparQ Access
Quantum Computing Report
In November 2026, the NQCC and Phasecraft signed an agreement to provide UK organizations with access to Phasecraft's quantum software via SparQ Access. This partnership aims to lower the technical barrier for evaluating quantum advantage…
-
AI-Assisted Proof Settles Longstanding Question About Quantum Speedups
The Quantum Insider
Insider Brief A proof of the Aaronson-Ambainis conjecture establishes that exponential quantum advantages in input reads require structure when answering yes-or-no questions on most randomly generated inputs. PSI said its research system…
-
University of Cambridge Joins UK Quantum Commercialisation Initiative
The Quantum Insider
Insider Brief The University of Cambridge has joined the UK Quantum SuperConnector, a five-university initiative designed to help commercialise quantum research and support the growth of quantum businesses across the UK. Cambridge’s…
-
Pasqal Reports Third-Quarter Revenue Decline as QPU Services Revenue Grows
The Quantum Insider
Insider Brief Pasqal reported €3.3 million in third-quarter 2026 revenue, down from €5.7 million a year earlier, while QPU-related services revenue increased 53% to €3.1 million. The neutral-atom quantum computing company reported €69.8…
-
ITIC Develops Taiwan-UK Partnership to Support Deep Tech Businesses
The Quantum Insider
Insider Brief Taiwan’s Industrial Technology Investment Corporation (ITIC), led by President Karen Yu, is developing a Taiwan–UK deep tech innovation corridor to connect British research with Taiwan’s engineering, manufacturing and…
-
Quantum SuperConnector to Accelerate Commercial Success of UK quantum Research
The Quantum Insider
Insider Brief Five UK universities have launched the UK Quantum SuperConnector, a national programme designed to help researchers turn quantum research into commercial ventures. Funded by UKRI through its Quantum IS8 programme, the…
-
Study Maps 24 Problems Where Quantum Computers Could Gain an Edge
The Quantum Insider
Insider Brief Researchers identified 24 computational problems with potential for substantial quantum speedups and outlined the conditions needed to achieve them. The study covers areas including chemistry, optimization and data analysis…
-
UK Announces New Funding to Support Quantum Technology Commercialisation
The Quantum Insider
Insider Brief The UK government and UKRI have announced new funding and initiatives to accelerate quantum technology commercialisation, adoption and workforce development. The announcements include £138 million for quantum sensing…
-
Toshiba Secures UK Contract to Develop Quantum Networking Technologies
The Quantum Insider
Insider Brief Toshiba Europe has secured an Innovate UK contract to develop technologies that support the expansion of commercial quantum networks across the UK. The project will develop prototype subsystems for long-distance quantum links…
-
UK NQCC Partners With Phasecraft to Expand Access to Quantum Software
The Quantum Insider
Insider Brief The UK’s National Quantum Computing Centre (NQCC) has signed an enterprise licensing agreement with Phasecraft to give UK businesses and researchers access to its quantum software through the SparQ Access initiative. The…
-
QNu Labs Launches Corporate Training Programme on Quantum-Safe Security
The Quantum Insider
Insider Brief QNu Labs has introduced a corporate training programme through QNu Academy to help enterprise cybersecurity professionals assess quantum-related risks and prepare for migration to quantum-safe security. The 12-hour programme…
-
Guest Post — Commercial Diplomacy: Building The Quantum Ecosystem
The Quantum Insider
Guest Post by by Charlene B. Flick, Esq. “Demonstrating that logical qubits can maintain coherence, we are paving the way toward fault-tolerant systems that can eventually scale to millions of qubits!” The CEO paused, seemingly absorbing…
-
ZeroTier Partners With Redapt to Deliver Post-Quantum Networking
The Quantum Insider
Insider Brief ZeroTier has partnered with Redapt to integrate its ZeroTier Quantum networking platform into Redapt’s infrastructure, cloud and managed services offerings. The platform uses post-quantum cryptographic standards, including…
-
High-performance cellular automaton decoders for quantum repetition and toric code
arXiv quant-ph
arXiv:2604.21866v2 Announce Type: replace Abstract: Execution of quantum algorithms on large-scale quantum computers will require extremely low logical error rates and scalable decoding architectures. Local decoders are promising…
-
Quantum Kicked Top: A Paradigmatic Model
arXiv quant-ph
arXiv:2604.12345v2 Announce Type: replace Abstract: The quantum kicked top (QKT) is one of the most widely studied models in quantum chaos, providing a minimal yet powerful framework for exploring the relationship between classical…
-
Probes of chaos over the Clifford group and approach to Haar values
arXiv quant-ph
arXiv:2603.29695v5 Announce Type: replace Abstract: Chaotic behavior of quantum systems can be characterized by the adherence of the expectation values of given probes to moments of the Haar distribution. In this work, we analyze the…
-
SesQ: A Surface Electrostatic Simulator for Precise Energy Participation Ratio Simulation in Superconducting Qubits
arXiv quant-ph
arXiv:2603.28524v3 Announce Type: replace Abstract: An accurate and efficient numerical electromagnetic model for superconducting qubits is essential for characterizing and minimizing design-dependent dielectric losses. The energy…
-
Dequantization Barriers for Guided Stoquastic Hamiltonians
arXiv quant-ph
arXiv:2602.23183v2 Announce Type: replace Abstract: We construct a probability distribution, induced by the Perron--Frobenius eigenvector of an exponentially large graph, that cannot be efficiently sampled by any classical algorithm, even…
-
Optimal Distributed Similarity Estimation of Quantum Channels
arXiv quant-ph
arXiv:2512.10465v5 Announce Type: replace Abstract: We study the query complexity of estimating the similarity of two unknown quantum channels available at separated devices. For channels $\mathcal{E}$ and $\mathcal{F}$ on a…
-
Statistical properties of quantum jumps between macroscopic states of light: reading an operational coherence record
arXiv quant-ph
arXiv:2512.07754v3 Announce Type: replace Abstract: We propose an experimental apparatus to reveal the quantum coherence manifested in downward quantum jumps of amplitude bistability. The underlying coherent superposition of macroscopic…
-
Quantum Data Representation via Circuit Partitioning and Reintegration
arXiv quant-ph
arXiv:2511.05492v3 Announce Type: replace Abstract: Quantum data encoding (QDE) enables faster com-putations than classical algorithms through superposition and en-tanglement. Circuit cutting and knitting are effective techniques for…
-
Observation of hysteresis in an isolated quantum system of disordered Heisenberg spins
arXiv quant-ph
arXiv:2508.18197v2 Announce Type: replace Abstract: We find energy-dependent hysteresis in an isolated Heisenberg quantum spin system, similar to thermomagnetic hysteresis in canonical spin glasses in contact with a thermal reservoir…
-
New exact solutions of the 3D Schr\"odinger equation
arXiv quant-ph
arXiv:2506.04725v3 Announce Type: replace Abstract: Previously we found a unique quantum system with a positive gauge-invariant Weyl-Stratonovich quasi-probability density function which can be defined by the so-called…
-
Hardware-Efficient Entanglement Distillation Using Bosonic Systems
arXiv quant-ph
arXiv:2503.09700v3 Announce Type: replace Abstract: High-fidelity entanglement shared between distant quantum systems is an essential resource for quantum communication and computation. Entanglement distillation addresses this need by…
-
Optimizing the statistical power of negative-partial-transpose-based entanglement tests
arXiv quant-ph
arXiv:2502.19624v2 Announce Type: replace Abstract: A key requirement of any separable quantum state is that its density matrix has a non-negative partial transpose. For continuous bipartite quantum states, violation of this condition may…
-
Fully Passive Quantum Conference Key Agreement
arXiv quant-ph
arXiv:2407.15761v4 Announce Type: replace Abstract: Quantum Conference Key Agreement (CKA) provides a secure method for multi-party communication. A recently developed interference-based prepare-and-measure quantum CKA possesses the…
-
Principles of Quantum Communication Theory: A Modern Approach
arXiv quant-ph
arXiv:2011.04672v3 Announce Type: replace Abstract: This is a preliminary version of a book in progress on the theory of quantum communication. We adopt an information-theoretic perspective throughout and give a comprehensive account of…
-
Dynamical effects induced by synthetic SU(1,1) gauge fields
arXiv quant-ph
arXiv:2611.08447v1 Announce Type: cross Abstract: Compact gauge fields are powerful tools for controlling quantum dynamics and topological phases of matter. Non-compact gauge fields are particularly relevant for open systems, where…
-
Atomic Static Electric Quadrupole Polarizability from Relativistic Many-Body Theory With Application To Thulium $\left(6s^2\, 4f^{13}\right)$\, $^2F_{7/2}$ and $^2F_{5/2}$
arXiv quant-ph
arXiv:2611.08348v1 Announce Type: cross Abstract: In the present work a method for calculating atomic static electric rank-$n$ tensor quadrupole polarizabilities $\alpha_Q^{(n)}(J)$ for arbitrary atomic electronic structure is presented…
-
Quantum Fourier integration of decay rates at next-to-leading order
arXiv quant-ph
arXiv:2611.08204v1 Announce Type: cross Abstract: We discuss the use of quantum neural networks (QNNs) as a tool for integrating decay rates at next-to-leading order (NLO) in perturbation theory. Data-encoding quantum circuits admit a…
-
Primitive Quantum Gates for an $SU(3)$ Discrete Subgroup: $\Sigma(216\times3)$
arXiv quant-ph
arXiv:2611.08161v1 Announce Type: cross Abstract: We construct a primitive gate set for the digital quantum simulation of the $648$-element discrete subgroup of $SU(3)$, $\dsb$. The five algorithmic primitives are the inversion, group…
-
Quantum transport of vortex electrons in bending magnets and circular accelerators
arXiv quant-ph
arXiv:2611.08010v1 Announce Type: cross Abstract: Controlling the sizes and phase structure of single-particle wave packets in accelerators remains an experimental challenge and requires understanding how bending magnets transform these…
-
Majorana corner modes and tunable braiding in an altermagnet-superconductor heterostructure
arXiv quant-ph
arXiv:2611.07645v1 Announce Type: cross Abstract: Zeeman fields are usually required for realizing and manipulating Majorana corner modes at the cost of suppressed superconducting pairing. Altermagnetism offers a new route toward realizing…
-
Probing Non-Abelian Topology through Quench Dynamics
arXiv quant-ph
arXiv:2611.07456v1 Announce Type: cross Abstract: Quench dynamics offer valuable insights to topological matter, wherein the emergent topological phenomena serve as a dynamic probe to the topology of static Hamiltonians. While such a…
-
Observable-Based Learning of Effective Entanglement Hamiltonians
arXiv quant-ph
arXiv:2611.07353v1 Announce Type: cross Abstract: Determining the entanglement Hamiltonian (EH) of an interacting quantum many-body system remains a fundamental challenge beyond special analytically tractable cases. Here we develop an…
-
Asymptotic advantage of quantum one-way and SMP communication for total functions
arXiv quant-ph
arXiv:2611.07318v1 Announce Type: cross Abstract: We exhibit a total Boolean function on n input bits whose bounded-error quantum simultaneous-message (and hence one-way) communication complexity is in O(\sqrt n), whereas its randomised…
-
Nonequilibrium Spin-Glass Order in a Long-Range Quantum Ising Glass and Its Sensitivity to Noise
arXiv quant-ph
arXiv:2611.07115v1 Announce Type: cross Abstract: We study spin-glass order after a transverse-field quench in a long-range quantum Ising glass. The diagonal-ensemble Edwards-Anderson order coincides at the no-quench and zero-field…
-
Coherent detector responses to quantum-controlled spherical-shell geometries
arXiv quant-ph
arXiv:2611.07041v1 Announce Type: cross Abstract: A detector inside a static spherical shell samples globally matched field modes even though its local geometry is flat. We construct the response of a compactly switched Unruh-DeWitt…
-
Constraint Variance Identity and the Matter-Geometry Fluctuation Relation
arXiv quant-ph
arXiv:2611.07015v1 Announce Type: cross Abstract: The quantum Hamiltonian constraint vanishes for physical states. For separable Hamiltonians in minisuperspace, its vanishing variance yields a fundamental identity. Under the…
-
On Entanglement Dynamics in Holographic Theories
arXiv quant-ph
arXiv:2611.07010v1 Announce Type: cross Abstract: Entanglement entropy (EE) is central to modern theoretical physics, yet its calculation in interacting theories with nontrivial time dependence remains challenging. In this thesis, we…
-
Multipartite Entanglement, TQFT Partition Functions and PL Bordism
arXiv quant-ph
arXiv:2611.07000v1 Announce Type: cross Abstract: In a previous work we conjectured that the multi-invariants of the ground state of a gapped $(d-1)+1$-dimensional system, labeled by bipartite $(d+1)$-edge-colored graphs encoding closed…
-
Provable circuit-level thresholds for non-abelian topological phases
arXiv quant-ph
arXiv:2611.08488v1 Announce Type: new Abstract: We provide an explicit scheme to realize a quantum memory in any 2D non-chiral topological order. For this, we construct syndrome extraction circuits based on the Turaev-Viro path integral as…
-
Room-Temperature Quantum Emission from Boron Nitride Nanotubes
arXiv quant-ph
arXiv:2611.08460v1 Announce Type: new Abstract: Quantum information systems such as quantum key distribution and quantum communications require bright, high-purity, stable sources of single photons to act as carriers of quantum…
-
Polynomial-time classical simulation of boson and fermion sampling under thermal loss
arXiv quant-ph
arXiv:2611.08444v1 Announce Type: new Abstract: Sampling experiments are a leading approach to demonstrating quantum computational advantage, yet their robustness to experimental noise is not completely understood. We develop a common…
-
Quantum enhanced beam displacement estimation: sensitivity limits, optimal probes, and measurement schemes
arXiv quant-ph
arXiv:2611.08427v1 Announce Type: new Abstract: We investigate the ultimate sensitivity limits for measuring small transverse beam displacements and identify optimal strategies that attain them, using the framework of mode parameter…
-
Recalibration-Aware Optimization of ZEFOZ Operating Points in $^{167}\mathrm{Er}^{3+}:\mathrm{Y}_2\mathrm{SiO}_5$ for Quantum Memories
arXiv quant-ph
arXiv:2611.08396v1 Announce Type: new Abstract: Erbium-doped solids like $^{167}\mathrm{Er}^{3+}:\mathrm{Y}_2\mathrm{SiO}_5$ have properties that make them suitable for quantum-network memories, however, their unquenched effective…
-
Testing Gravitationally-Induced-Entanglement with Massive Particles and Quantum Clocks
arXiv quant-ph
arXiv:2611.08313v1 Announce Type: new Abstract: We present an experimental proposal to test whether gravity can entangle a levitated particle with an array of quantum clocks. By harnessing the collective interaction between a…
-
Recovery gates as a resource in repetition-code process tomography: exhaustive gate-optimal designs for three, five and seven qubits
arXiv quant-ph
arXiv:2611.08310v1 Announce Type: new Abstract: Process tomography built on stabilizer codes compares the logical channel of a repetition code with a reference channel, and the decoder that produces that channel is almost always fixed to…
-
Entropic measures of quantum information
arXiv quant-ph
arXiv:2611.08254v1 Announce Type: new Abstract: Entropy has played a pivotal role in physics ever since its inception by Clausius in the early industrial age. Shannon ushered the concept into the information age by using it to describe…
-
Finite-Time Thermodynamic Routing in an Anharmonic Collective Quantum Otto Engine
arXiv quant-ph
arXiv:2611.08242v1 Announce Type: new Abstract: The Gibbs state determined by a thermal reservoir does not determine how a working medium approaches it or how fluctuations accumulate over repeated cycles. We exploit this kinetic freedom in…
-
Optimal finite-copy readout of three-qubit entanglement with state retention
arXiv quant-ph
arXiv:2611.08233v1 Announce Type: new Abstract: For unknown three-qubit pure states, we characterize the optimal trade-off among GHZ-class certification, binary probability readout of the three-tangle, and conditional state retention. The…
-
Non-Unitary Quantum Butterfly Effect: Theory and Experiment
arXiv quant-ph
arXiv:2611.08152v1 Announce Type: new Abstract: We present a generalization of the out of time order correlator (OTOC) for non-unitary systems. For a Haar-random brickwork qudit-circuit, peppered with local, projective measurement, we…
-
Machine learning quantum data to accelerate quantum Monte Carlo
arXiv quant-ph
arXiv:2611.08151v1 Announce Type: new Abstract: Simulating strongly correlated electrons in molecules and materials remains a central goal for quantum computing. A promising strategy uses quantum processors to prepare trial wavefunctions…
-
Quantum trajectory of a spin oscillator, continuous retrodiction beyond the Heisenberg uncertainty relation
arXiv quant-ph
arXiv:2611.08104v1 Announce Type: new Abstract: The Heisenberg uncertainty relation in quantum mechanics limits the precision of predicting the outcome of measurements of any non-commuting observables. However, this restriction does not…
-
Nonuniform Time-bins for Making Raw QRNG Outputs Uniform
arXiv quant-ph
arXiv:2611.08096v1 Announce Type: new Abstract: Random numbers play a vital role in scientific simulations and cryptography. Both randomness and security are critical requirements for random number generators (RNGs). However, classical…
-
Exponential mixing time for the Davies dynamics of the quantum random energy model
arXiv quant-ph
arXiv:2611.08064v1 Announce Type: new Abstract: We prove exponentially slow thermalization for the quantum random energy model (QREM) under Davies dynamics. The QREM is the $n$-qubit Hamiltonian $H=\Gamma T+U$, where $U$ assigns…
-
Approaching quantum limits in sub-Rayleigh resolution using phase modulation optimization
arXiv quant-ph
arXiv:2611.08034v1 Announce Type: new Abstract: Spatial-mode demultiplexing (SPADE) has made significant progress in incoherent optical imaging and has been implemented through various experimental approaches. Holography-based SPADE is…
-
Quantum Relative Entropy and Information Flux Resolve Wavefunction Collapse in Spacelike-Separated QED Waveguides
arXiv quant-ph
arXiv:2611.08000v1 Announce Type: new Abstract: Resolving how first-order quantum coherence and definite measurement outcomes emerge from entangled vacuum fluctuations across spacelike-separated regions is unified here by the principle…
-
Crosstalk-Induced Row Hammer Attacks on Quantum Random Access Codes
arXiv quant-ph
arXiv:2611.07983v1 Announce Type: new Abstract: Quantum processors remain susceptible to crosstalk-induced effects despite the continuous evolution of their underlying hardware architectures. In this work, we experimentally investigate the…
-
Monopoles, Scattering and Generalized Symmetries on a Quantum Computer
arXiv quant-ph
arXiv:2611.07960v1 Announce Type: new Abstract: Quantum computers have advanced to the stage that interesting many-body quantum phenomena can be observed. A striking example is the magnetic monopole paradox, a problem that was only solved…
-
Negative non-linear differential dissipation in mechanical quartz resonators
arXiv quant-ph
arXiv:2611.07895v1 Announce Type: new Abstract: We observe negative non-linear differential dissipation in a low-frequency (32.7 kHz) miniature quartz tuning fork, representing a high-Q piezoelectric resonator, at temperatures below 0.3 K…
-
Continuous variable payload transmitter for the SPOQC mission
arXiv quant-ph
arXiv:2611.07861v1 Announce Type: new Abstract: The continuous variable (CV) quantum key distribution (QKD) scheme enables two parties to share a secret key separated by a certain distance. Here we propose, design, build, test and show…
-
Constrained Quantum Imaginary Time in Krylov Space
arXiv quant-ph
arXiv:2611.07800v1 Announce Type: new Abstract: We introduce constrained quantum imaginary time evolution (CQITE), extending quantum imaginary time evolution (QITE) to constrained-search dynamics for ground-state preparation with…
-
Development of time-resolved fluorescence spectroscopy using heralded emission spectroscopy for organic light-emitting materials
arXiv quant-ph
arXiv:2611.07770v1 Announce Type: new Abstract: Organic light-emitting materials are widely used in optoelectronics and bioimaging, but sometimes conventional fluorescence spectroscopy techniques can be limited by scattering, background…
-
Observation of Inter-Transition Interference
arXiv quant-ph
arXiv:2611.07768v1 Announce Type: new Abstract: Many well-known quantum interference phenomena are associated with coherent superpositions of quantum states. Recent theoretical work showed that dissipative coupling between transition…
-
Separability and lower bounds of concurrence via symmetric measurement correlations
arXiv quant-ph
arXiv:2611.07727v1 Announce Type: new Abstract: The detection and quantification of quantum entanglement is a central issue in quantum information science, particularly for unknown quantum states. Based on symmetric measurement correlation…
-
Optimal quantum metrology with restricted controls
arXiv quant-ph
arXiv:2611.07583v1 Announce Type: new Abstract: Quantum control can enhance sensing precision, but practical protocols are constrained by probe preparation and the available control resources. Optimizing the sensing protocol within these…
-
Bell Test and Quantum State-Space Geometry
arXiv quant-ph
arXiv:2611.07450v1 Announce Type: new Abstract: We explore a minimal phenomenological model of coupling between the geometry of the classical spacetime and the quantum state space. Assuming a simple structure of the combined manifold…
-
Information flow control in hybrid quantum networks
arXiv quant-ph
arXiv:2611.07440v1 Announce Type: new Abstract: Quantum resources can change the dynamical features and operational behaviors of conventional networks. Long-distance entanglement supports information transfer between nodes lacking a direct…
-
Weak Values in Postselected Quantum Trajectories
arXiv quant-ph
arXiv:2611.07404v1 Announce Type: new Abstract: Weak value (WV) describes the amplified response of a meter when the measured system undergoes postselection. While conventional WV theory mainly rests on a single system-meter interaction…
-
Higher-order topological quantum battery
arXiv quant-ph
arXiv:2611.07401v1 Announce Type: new Abstract: A quantum battery is a next-generation energy-storage device that exploits genuinely quantum properties such as superposition and coherence. We propose a second-order topological quantum…
-
Certifying the Rydberg-exposure limit of a globally driven controlled-Z gate
arXiv quant-ph
arXiv:2611.07388v1 Announce Type: new Abstract: Rydberg excitation enables entangling gates in neutral-atom quantum processors but also exposes them to spontaneous decay. Whether this exposure can be made arbitrarily small through pulse…
-
Fidelity Determines the Minimum Error of Quantum Recovery
arXiv quant-ph
arXiv:2611.07344v1 Announce Type: new Abstract: Even a recovery that maximizes worst-input entanglement fidelity can retain avoidable errors in subsequent measurements. Entanglement fidelity is the probability of passing a test of whether…
-
Quantum simulation of classical RCL circuits via complexification and Schr\"odingerization
arXiv quant-ph
arXiv:2611.07300v1 Announce Type: new Abstract: The decomplexification procedure establishes a mathematical equivalence between finite dimensional quantum dynamics and classical dynamics by mapping the complex quantum domain onto the real…
-
Unifying First-Order Coherence, Concurrence, and Bell Correlations in Three-Flavor Neutrino Oscillations
arXiv quant-ph
arXiv:2611.07285v1 Announce Type: new Abstract: Neutrino oscillations provide a natural setting for investigating the quantum character of flavor conversion and the distribution of quantum resources over macroscopic distances. Here, we…
-
Thermally-driven quantum reservoir computing
arXiv quant-ph
arXiv:2611.07187v1 Announce Type: new Abstract: Heat generation limits computation, classical and quantum, from single logic gates to entire data centers. However, an in principle limiting physical factor can sometimes be turned into a…
-
Scalable Transpilation for Overcoming Restricted Connectivity in Distributed Superconducting Quantum Architectures
arXiv quant-ph
arXiv:2611.07175v1 Announce Type: new Abstract: Distributed Quantum Computing (DQC) offers a promising pathway to scale superconducting quantum hardware, but restricted inter- and intra-module connectivity creates a major transpilation…
-
Improving Gravitationally Induced Entanglement in Interferometric Configurations
arXiv quant-ph
arXiv:2611.07153v1 Announce Type: new Abstract: Proposals to detect gravitationally induced entanglement between massive particles offer a promising pathway toward probing the quantum nature of gravity. We perform a systematic geometric…
-
Dithered Belief Propagation for Real-Time Quantum Memory Decoding
arXiv quant-ph
arXiv:2611.07144v1 Announce Type: new Abstract: We introduce dithered belief-propagation decoding for circuit-level quantum memory to mitigate the oscillations and trapping behavior that limit standard belief-propagation (BP) decoders for…
-
Particle-loss error correction using $2^l$-step states generated via particle-number-resolving measurement schemes
arXiv quant-ph
arXiv:2611.07101v1 Announce Type: new Abstract: We present an iterative scheme for generating finite superpositions of Fock states whose photon numbers differ by $2^l$ ($2^l$-step states). We derive an upper bound on the probability of…
-
Ground-State Dressing and Delayed Feedback of a Chiral Giant Atom in Ultrastrong Waveguide QED
arXiv quant-ph
arXiv:2611.07036v1 Announce Type: new Abstract: We study a chiral giant atom ultrastrongly coupled to a one-dimensional waveguide at two spatially separated points. At a relative coupling phase \pi/2, the total spectral density is…
-
Single-shot ground-state preparation via strongly coupled baths
arXiv quant-ph
arXiv:2611.07021v1 Announce Type: new Abstract: Preparing ground and thermal states of quantum many-body systems is a central task in quantum simulation. Dissipative protocols have emerged as a promising solution for both near-term and…
-
Threshold-Free Symmetry-Enriched Topological Quantum Memory
arXiv quant-ph
arXiv:2611.07017v1 Announce Type: new Abstract: We show that non-Abelian symmetry enrichment can protect a toric code memory against incoherent electric noise at any bond error probability $p\in[0,1]$. For a toric code on the honeycomb…
-
All Bell inequalities with a quantum advantage in the minimal scenario are self-testing
arXiv quant-ph
arXiv:2611.06997v1 Announce Type: new Abstract: In the minimal Bell scenario, all extremal quantum correlations are known, but the Tsirelson inequalities that delimit the quantum set remain poorly understood. We study which correlations…
-
FNO-Based Inverse Co-Design of Semiconducting Quantum-Dot Devices
arXiv quant-ph
arXiv:2611.06994v1 Announce Type: new Abstract: Gate-defined semiconductor quantum dots are promising building blocks for scalable spin-based quantum processors, however their operational properties depend on several fabrication and…
-
Physical regimes of quartic quantum advantage in elastic media simulation
arXiv quant-ph
arXiv:2611.06975v1 Announce Type: new Abstract: Quantum algorithms for elastic media simulation have been conjectured to offer up to a quartic quantum advantage over classical methods; however, the devil is always in the details. Here, we…
-
Topological metal-insulator transitions in one-dimensional non-Hermitian quasicrystals: beyond PT-symmetry
arXiv quant-ph
arXiv:2605.25072v2 Announce Type: replace-cross Abstract: One-dimensional non-Hermitian quasicrystals with parity and time-reversal (PT) symmetry can simultaneously exhibit localization-delocalization transition, topological phase…
-
Singlet-only always-on gapless exchange (SAGE) spin qubits: Charge noise effects and two-qubit gates
arXiv quant-ph
arXiv:2604.15419v2 Announce Type: replace-cross Abstract: Singlet-only always-on gapless exchange (SAGE) spin qubits are an alternative type of exchange-only (EO) qubits that encode a single qubit in the spins of four electrons located in…
-
eigenkit: A Provider-Neutral Quantum Computing Library
arXiv quant-ph
arXiv:2611.02979v2 Announce Type: replace Abstract: Quantum software ecosystems provide increasingly capable tools for simulation and hardware execution, but differences in programming models, supported features, and backend capabilities…
-
Optimal Quantum Junta Testing
arXiv quant-ph
arXiv:2609.37926v2 Announce Type: replace Abstract: We determine the quantum query complexity of testing $k$-juntas for Boolean functions, unitaries, and quantum channels. Let $n$ denote the number of input bits or qubits and $\varepsilon$…
-
Saturating the Bayesian Nagaoka-Hayashi bound within numerical precision for the depolarization SU(2) rotation channel
arXiv quant-ph
arXiv:2607.15398v2 Announce Type: replace Abstract: The Bayesian Nagaoka--Hayashi (NH) bound is a semidefinite lower bound on the Bayes risk of multiparameter estimation, tighter than the Bayesian symmetric logarithmic derivative (SLD)…
-
Quantum Channel Polynomial Processing
arXiv quant-ph
arXiv:2607.06557v3 Announce Type: replace Abstract: We introduce a quantum algorithmic framework based on probabilistic mixtures of unitary channels that, similar to the framework of quantum singular value transformations, enables the…
-
Computational and physical complexity of synthesizing random multi-qudit quantum states and unitary operators
arXiv quant-ph
arXiv:2605.07374v2 Announce Type: replace Abstract: We analyze the complexity of synthesizing random states and unitary operators in a multi-qudit system in two paradigms. In one case, we consider the situation in which we manipulate the…
-
General method for obtaining the energy minimum of spin Hamiltonians for separable states
arXiv quant-ph
arXiv:2605.03022v2 Announce Type: replace Abstract: We introduce a highly general method to determine the energy minimum of spin Hamiltonians over separable states when the single-particle reduced density matrices are fixed. We present…
-
Using spatiotemporal Born rule for testing macroscopic realism
arXiv quant-ph
arXiv:2603.21793v2 Announce Type: replace Abstract: We show that, given an evolving quantum system and the quasiprobability distribution generated by the spatiotemporal generalization of the Born rule in pseudo-density matrices (PDMs)…
-
Quantum Theory Over Dual-Complex Numbers
arXiv quant-ph
arXiv:2603.17581v2 Announce Type: replace Abstract: We take quantum theory and replace C by C[e] where e^2 = 0, i.e. we extend quantum theory to the ring of dual complex numbers. The aim is to develop a common language in which to treat…
-
Generating entangled polaritonic condensates by pumping with entangled pairs of photons
arXiv quant-ph
arXiv:2602.22778v2 Announce Type: replace Abstract: We investigate the steady state of two single-mode, uniform, spatially separated polaritonic condensates exposed to resonant pumping with entangled pairs of photons in the presence of…
-
Trotterization, Operator Scrambling, and Entanglement
arXiv quant-ph
arXiv:2506.23345v2 Announce Type: replace Abstract: Operator scrambling describes how initially local operators spread under many-body dynamics and is closely connected to quantum chaos. In this work, we reveal a connection between…
-
Fast simulations of X-ray absorption spectroscopy for battery materials on a quantum computer
arXiv quant-ph
arXiv:2506.15784v3 Announce Type: replace Abstract: X-ray absorption spectroscopy (XAS) is a leading technique for understanding structural changes in advanced battery materials such as lithium-excess cathodes. However, extracting critical…
-
Hybrid Oscillator-Qubit Quantum Processors: Simulating Fermions, Bosons, and Gauge Fields
arXiv quant-ph
arXiv:2409.03747v2 Announce Type: replace Abstract: Key to solving many societally-relevant problems in materials science, quantum chemistry and nuclear physics is understanding their fundamental microscopic quantum behaviour. All of these…
-
Enhanced quantum sensing mediated by a cavity in open systems
arXiv quant-ph
arXiv:2312.04766v3 Announce Type: replace Abstract: We simulate the dynamics of systems with multiple qubits coupled to a cavity in order to assess their potential for quantum metrology of a parameter in the open systems limit. The qubits…
-
Asymptotic analysis of the dynamical field-field correlation function of the impenetrable Bose gas
arXiv quant-ph
arXiv:2611.08350v1 Announce Type: cross Abstract: We study the long-time, large-distance asymptotic behaviour of the two-point correlation function of fields of the impenetrable Bose gas in equilibrium states characterized by a…
-
Coherent phase slips in coupled rings: from weak to strong interactions
arXiv quant-ph
arXiv:2611.08168v1 Announce Type: cross Abstract: We study the coherent transfer of circulation between two weakly coupled lattice rings of ultracold bosons, in which a persistent current initially prepared in one ring oscillates back and…
-
Universal Phase Locking from Slowly Varying Inhomogeneity in Tunnel-Coupled One-Dimensional Condensates
arXiv quant-ph
arXiv:2611.07657v1 Announce Type: cross Abstract: The sine-Gordon model can be experimentally realised by tunnel-coupled one-dimensional Bose condensates. However, the experiments show relaxation to a phase-locked state, which conflicts…
-
Information-Spectrum General Formulas for the Capacity Region of Classical-Quantum Multiple Access Channels
arXiv quant-ph
arXiv:2611.07462v1 Announce Type: cross Abstract: For classical-quantum multiple access channels (cq-MACs) with two senders, we give several general expressions for the capacity region, valid for arbitrary sequences of channels. In the…
-
Demystifying Graviton Detection
arXiv quant-ph
arXiv:2611.07447v1 Announce Type: cross Abstract: Detecting single gravitons is possible through the extraction of discrete energy quanta from passing gravitational waves. For decades, this was considered hopeless, with estimates…
-
Extensions of the Haldane gap proof: higher dimensions, near degeneracy, fermions and tensor-network states
arXiv quant-ph
arXiv:2611.07400v1 Announce Type: cross Abstract: A recent remarkable paper by OpenAI showed that the spin-one Heisenberg chain with periodic boundary conditions has a spectral gap in the thermodynamic limit. The proof elegantly deduces…
-
Unruh-DeWitt detectors in a delocalized massive shell
arXiv quant-ph
arXiv:2611.07058v1 Announce Type: cross Abstract: We construct a model for the response of a detector to vacuum fluctuations inside a massive hollow shell in a superposition of positions. The delocalized source mass gives rise to a…
-
Agnostic and efficient detection of $\mathbb{Z}_2$ symmetry-protected topological phases in projected entangled-pair states
arXiv quant-ph
arXiv:2611.07030v1 Announce Type: cross Abstract: Symmetry-protected topological (SPT) phases are the simplest example of quantum phases that cannot be detected by local order parameters. Their classification is by now well-established…
-
Quantum Knowledge Distillation: State-of-the-art, Applications and Open Problems
arXiv quant-ph
arXiv:2611.08461v1 Announce Type: new Abstract: Knowledge distillation transfers predictions, representations, or other supervisory information between learning models and is increasingly investigated in quantum machine learning. Its…
-
DiffSequence-Q: Diffusion Design with Quantum Assistance for Biologically Active Proteins
arXiv quant-ph
arXiv:2611.08434v1 Announce Type: new Abstract: Designing protein sequences that satisfy both secondary structure requirements and solubility targets remains challenging. We present DiffSequence-Q, a hybrid multinomial diffusion model…
-
Disorder-blind Mpemba acceleration of quantum state preparation
arXiv quant-ph
arXiv:2611.08424v1 Announce Type: new Abstract: Using the strong Mpemba effect to accelerate relaxation by initial-state design requires suppressing the slowest mode, which typically needs prior knowledge of the system. However, in…
-
Beyond Quantum Messages: Toward Quantum-Native Network Functioning
arXiv quant-ph
arXiv:2611.08298v1 Announce Type: new Abstract: The Quantum Internet is commonly envisioned as a network that transports quantum states and distributes entanglement as the key resource underpinning distributed quantum applications. This…
-
Dualities in one-dimensional quantum lattice models: Lie groups, Schur-Weyl duality and symmetry breaking
arXiv quant-ph
arXiv:2611.08293v1 Announce Type: new Abstract: We present a systematic framework for gauging continuous symmetries, and show that the Schur-Weyl duality arises naturally as a realization of this construction with open boundary conditions…
-
Certifying quantum code and circuit distances at scale
arXiv quant-ph
arXiv:2611.08247v1 Announce Type: new Abstract: Code and circuit distances characterize how strongly quantum error correction suppresses logical errors and guide code comparisons, schedule choices and resource estimates. Yet many published…
-
Persistent level-resolved transmon population after dispersive readout, and the limits of its open-system description
arXiv quant-ph
arXiv:2611.08235v1 Announce Type: new Abstract: We calculate the level-resolved transmon population remaining after dispersive readout with a converged open-system model. The drive and qubit-cavity coupling use the rotating-wave…
-
Quantum Advantage with Sign-Free Proofs: An Oracle Separation between $\mathsf{StoqMA}$ and $\mathsf{MA}$
arXiv quant-ph
arXiv:2611.08180v1 Announce Type: new Abstract: Several landmark oracle results (FOCS 2000, FOCS 2025, STOC 2026) establish strict separations along the chain $\mathsf{MA} \subseteq \mathsf{QCMA} \subseteq \mathsf{QMA}$, showing that…
-
Nonperturbative optomechanics with thin, weakly reflective intracavity dielectrics
arXiv quant-ph
arXiv:2610.15749v2 Announce Type: replace-cross Abstract: Levitated dielectric sensors are often treated as perturbative probes of a pre-existing optical field. We show that this picture fails for a novel sensor geometry: a dielectric…
-
Semi-Analytical Geometric Synthesis of Robust Quantum Controls
arXiv quant-ph
arXiv:2611.08107v1 Announce Type: new Abstract: High-fidelity quantum gates are a central requirement for fault-tolerant quantum computation, yet their implementation is limited by the sensitivity of qubits to environmental noise and by…
-
Coupling between molecular exchange qubits
arXiv quant-ph
arXiv:2611.08058v1 Announce Type: new Abstract: Spin triangles are promising systems for defining and manipulating scalar degrees of freedom, such as chirality, partial spin sums, or combinations between the two. Here we extend this…
-
Effective Thermodynamics of a Volume-Dependent Qubit
arXiv quant-ph
arXiv:2611.08040v1 Announce Type: new Abstract: We develop an effective thermodynamics for a qubit whose energy gap depends inversely on a volume-like control parameter, $\Delta(V)=\Delta_0/V$, where $V$ is a spectral-control coordinate…
-
From maximum work to maximum power in an optimally controlled quantum Ising Otto engine
arXiv quant-ph
arXiv:2611.08025v1 Announce Type: new Abstract: In finite-time quantum Otto engines, maximizing power requires balancing the duration of the unitary strokes against the losses from nonadiabatic excitations. We address this trade-off in an…
-
Autler-townes energy-level engineering for high-quality all-microwave qubit gate
arXiv quant-ph
arXiv:2611.07967v1 Announce Type: new Abstract: High-fidelity entangling gates are essential for realizing large-scale fault-tolerant superconducting quantum computing, yet existing approaches are limited: frequency-tuning techniques…
-
Multirobust Control Pulses Designed by Iterative Quantum Kolmogorov-Arnold-Moser Algorithm
arXiv quant-ph
arXiv:2611.07802v1 Announce Type: new Abstract: We introduce a multi-robust quantum control strategy designed to suppress multilevel leakage outside the computational qubit space while simultaneously ensuring robustness against unknown…
-
Discrete quadrature spectrum of composite bosons: Weyl relation, intensity correlations, and binned homodyne detection
arXiv quant-ph
arXiv:2611.07776v1 Announce Type: new Abstract: A composite boson made of two fermions can look elementary under one measurement and composite under another. In an exactly solvable paired-mode model we compare three probes: classical…
-
Detecting Nonbilocal Correlations via Parameterized Elegant Joint Measurement
arXiv quant-ph
arXiv:2611.07769v1 Announce Type: new Abstract: Quantum networks constitute a defining resource for quantum information processing; however, their nonclassical behavior is jointly governed by the choice of measurement basis and the…
-
Efficient preparation of spin-squeezed states with Grover's algorithm
arXiv quant-ph
arXiv:2611.07766v1 Announce Type: new Abstract: We propose a scheme for preparing spin-squeezed states in an ensemble of $N$ spin-$1/2$ particles based on Grover's algorithm. With only a few oracles, the scheme can exactly prepare…
-
Observing mixed-state Uhlmann winding numbers in integrated photonic quantum walks
arXiv quant-ph
arXiv:2611.07600v1 Announce Type: new Abstract: Integer winding numbers provide a well-established classification of topological phases protected by chiral symmetry at zero temperature, but extending this classification to thermal mixed…
-
Efficient Pauli Truncation from Operator Stabilizer R\'enyi Entropy
arXiv quant-ph
arXiv:2611.07545v1 Announce Type: new Abstract: Operator stabilizer R\'enyi entropy (OSE) quantifies the magic of Heisenberg operators and serves as a diagnostic of their compressibility in the Pauli basis. We establish rigorous bounds…
-
Elimination of quantum causal confusion in the presence of dual states
arXiv quant-ph
arXiv:2611.07449v1 Announce Type: new Abstract: There is a rich class of bipartite quantum correlations between qubits which are consistent both with measurements performed in parallel and measurements performed in sequence. This…
-
Spin-Exchange-Controlled Nonclassical Light in Cavity Electromagnetically Induced Transparency
arXiv quant-ph
arXiv:2611.07382v1 Announce Type: new Abstract: Controlling nonclassical light while maintaining a finite cavity response requires selective suppression of unwanted multiphoton excitation. We investigate a ring-cavity system containing two…
-
Operational Characterizations and Resource Structure of the Interactive Weight of Quantum Instruments
arXiv quant-ph
arXiv:2611.07371v1 Announce Type: new Abstract: Quantifying the interactivity of quantum instruments is fundamental to understanding their resource structure and operational capabilities. Here, we introduce the interactive weight of…
-
Frustration-freeness is decidable but unprovable
arXiv quant-ph
arXiv:2611.07337v1 Announce Type: new Abstract: The frustration-free property is valuable in quantum many-body systems, which states that its ground states simultaneously minimize all local interaction terms, even when these terms act on…
-
Upper and lower bounds for few-copy Gaussian tomography, and the absence of a fermionic warm regime
arXiv quant-ph
arXiv:2611.07271v1 Announce Type: new Abstract: Chen, Mele, Mele and Preskill proved a crossover for bosonic Gaussian tomography: cold states need $\Theta(m^3/\epsilon^2)$ copies under single-copy or few-copy measurements, warm ones…
-
Field-aligned measurement removes the anisotropy barrier of sample-based quantum subspace solvers for magnetized-plasma heat conduction
arXiv quant-ph
arXiv:2611.07102v1 Announce Type: new Abstract: Sample-based quantum subspace methods construct a small subspace from measured basis states and solve the target problem classically within it. We study these methods for heat conduction in…
-
Quantum Noise Engineering in Advanced LIGO
arXiv quant-ph
arXiv:2611.07074v1 Announce Type: new Abstract: Advanced LIGO is a gravitational-wave detector with extreme sensitivity, operating close to the quantum limits of optical measurement. The quantum noise in this system arises from vacuum…
-
Nonlocal magic of fermions is bounded by entanglement fluctuations and is logarithmic for free fermions
arXiv quant-ph
arXiv:2611.07003v1 Announce Type: new Abstract: Free-fermion states are classically simulable, yet, written as qubits, they typically carry extensive magic, the quantum resource that stabilizer circuits lack. Part of this magic is…
-
Accelerating Quantum-Classical Auxiliary-Field Quantum Monte Carlo with Shadow-Trained Neural Quantum States
arXiv quant-ph
arXiv:2611.08129v1 Announce Type: new Abstract: Quantum-classical auxiliary-field quantum Monte Carlo (QC-AFQMC) uses a trial state prepared on a quantum computer to improve the accuracy of the classical AFQMC algorithm. State-of-the-art…
-
Generalized Effective Spin-Chain formalism for multicomponent anyons in one-dimensional optical lattices
arXiv quant-ph
arXiv:2609.36555v2 Announce Type: replace-cross Abstract: We develop a generalized effective spin-chain (GESC) formalism for strongly interacting multicomponent anyons in a one-dimensional (1D) optical lattice. By mapping particle motion…
-
Multicomponent anyons in one-dimensional optical lattices
arXiv quant-ph
arXiv:2609.36554v2 Announce Type: replace-cross Abstract: We investigate the ground-state and dynamical properties of multicomponent interacting anyons confined in a one-dimensional (1D) optical lattice. Adopting the Anyon-Hubbard model…
-
Entanglement in Presence of Topological Interfaces and Dualities
arXiv quant-ph
arXiv:2607.22451v2 Announce Type: replace-cross Abstract: Entanglement through interfaces has attracted considerable attention in 2d conformal field theory (CFT). However, it is known that field-theoretic predictions based on the existing…
-
Ising anyons in the $SU(2)_2$ Chern--Simons theory
arXiv quant-ph
arXiv:2605.15268v2 Announce Type: replace-cross Abstract: Ising anyons and $SU(2)_2$ Chern--Simons theory share the fusion rules and $F$-symbols, and their $R$-symbols agree up to braiding orientation and an overall phase. The…
-
Efficient construction and explicit dimensionality of Lie group-equivariant and permutation-invariant spaces
arXiv quant-ph
arXiv:2604.01975v3 Announce Type: replace-cross Abstract: We give a practical construction of functions of $N$ variables that are simultaneously equivariant under a group action and invariant under permutations, or simply…
-
Optimal expansion in unitary groups I: Golden adelic groups and cutoff
arXiv quant-ph
arXiv:2509.09047v2 Announce Type: replace-cross Abstract: In this paper and its companion [DEP2] we construct and study special generating sets for $p$-arithmetic unitary Lie groups, extending the seminal works of Lubotzky, Phillips and…
-
Quantum communication: a discrimination approach
arXiv quant-ph
arXiv:2610.40358v2 Announce Type: replace Abstract: We develop a state discrimination approach to unassisted quantum communication through a noisy quantum channel. Starting from the operational duality between entanglement recovery and…
-
Leakage suppression for high-fidelity exchange gates and quantum simulation in superconducting circuits
arXiv quant-ph
arXiv:2609.37296v2 Announce Type: replace Abstract: Parametric frequency modulation makes superconducting interactions programmable for quantum gates and quantum simulation. Leakage into higher transmon levels and coupler modes degrades…
-
On the geometry, typicality, and detectability of quantum magic
arXiv quant-ph
arXiv:2609.03944v3 Announce Type: replace Abstract: Quantum magic, or nonstabilizerness, is a central resource for quantum computation, motivating a systematic study of its mathematical structure and physical behavior. Here we characterize…
-
A hardware-efficient variational ansatz with an exact diagonal metric for real- and imaginary-time evolution and Haar sampling
arXiv quant-ph
arXiv:2607.07942v2 Announce Type: replace Abstract: Variational quantum algorithms depend on the geometry of their parametrised circuits: metric-aware optimisation and time evolution require the Fubini--Study metric, which has hitherto…
-
Quantum Trajectories: Ergodicity, Perturbative Dynamics, and Stationary Response
arXiv quant-ph
arXiv:2606.13470v3 Announce Type: replace Abstract: Quantum trajectories capture measurement-conditioned statistics beyond ensemble averages. For finite-dimensional Kraus dynamics, complete-reset and overlap conditions yield a unique…
-
Efficient Multi-Controlled Gate Implementation in Trapped-Ion Systems
arXiv quant-ph
arXiv:2605.04654v2 Announce Type: replace Abstract: Multi-controlled gates are essential primitives in quantum algorithms, yet implementing them via standard gate-level decompositions remains resource-intensive. We develop efficient…