Quantum Computing
Quantum Computing news — Wednesday 07 October 2026
150 stories from 3 sources, every one in English. Each links to its publisher.
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Cisco Releases Quantum Network Controller and Network-Aware Compiler v0.2.0 for Distributed Quantum Infrastructure
Quantum Computing Report
Cisco's Outshift division has launched the Quantum Network Controller and Network-Aware Quantum Compiler v0.2.0 to manage multi-node quantum networks. The Controller offers Entanglement-as-a-Service, enabling on-demand entanglement across…
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QuantumCT Opens 4,500 Sq. Ft. Innovation Headquarters in New Haven to Anchor Connecticut Quantum Corridor
Quantum Computing Report
QuantumCT has opened its 4,500-square-foot innovation headquarters in New Haven, serving as a central hub for quantum computing research, talent development, and startup incubation. This initiative, backed by significant public and private…
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Haiqu Unveils AgenticOS Platform for Automated, Scientifically Verified Quantum Research Workflows
Quantum Computing Report
Haiqu has launched AgenticOS, an AI-driven platform that automates quantum computing research workflows. It uses specialized AI agents and a test-driven development approach to prevent errors and ensure scientific accuracy in complex…
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Infineon and ZuriQ Deepen Partnership to Industrialize 2D Trapped-Ion Penning Micro-Trap Chips
Quantum Computing Report
Infineon Technologies and ZuriQ AG have expanded their partnership to industrialize 2D trapped-ion Penning micro-trap chips for quantum computing. This collaboration aims to scale trapped-ion quantum processing units by combining ZuriQ's…
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KQC Quantum and Charlton Aria Agree on Nasdaq Business Combination
The Quantum Insider
Insider Brief KQC Quantum and Charlton Aria Acquisition Corporation have entered into a definitive business combination agreement that would take KQC public on Nasdaq under the expected ticker KQC. KQC plans to use the transaction proceeds…
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Haiqu Releases AgenticOS to Plan and Check Quantum Research
The Quantum Insider
Insider Brief Haiqu launched AgenticOS, a system that coordinates specialized AI agents to plan, validate and prepare quantum research experiments for hardware execution under human oversight. In a chemistry test, Haiqu reported that four…
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Jülich Supercomputing Centre Benchmark Evaluates Quantum Error Correction Primitives Across Quantinuum, IBM, and IQM Hardware
Quantum Computing Report
A Jülich Supercomputing Centre benchmark evaluated Quantum Error Correction (QEC) primitives on hardware from Quantinuum, IBM, and IQM. Quantinuum's trapped-ion systems showed the best performance, maintaining algorithmic signal clarity on…
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Korea Quantum Computing (KQC) to Go Public on Nasdaq via $80 Million SPAC Merger with Charlton Aria
Quantum Computing Report
KQC Quantum, an enterprise quantum computing and post-quantum cybersecurity developer, is going public on Nasdaq through an $80 million SPAC merger with Charlton Aria Acquisition Corporation. The merger, expected to close in the first half…
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Federal Quantum Readiness Falls Short as Agencies Face Cryptography Skills Gaps
The Quantum Insider
Insider Brief In a public report on PQC preparedness, the GAO found that none of 24 major federal agencies reviewed fully addressed all three preparation practices for protecting systems against future quantum computing threats. The review…
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Infineon and ZuriQ Deepen Partnership to Advance Scalable Quantum Chips
The Quantum Insider
Insider Brief Infineon Technologies and ZuriQ AG are expanding their collaboration to scale ZuriQ ’s two-dimensional trapped-ion quantum computing architecture. The companies previously demonstrated a 3×3 array of nine individually…
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Eclipse Qrisp Wins Quantum Effects Award 2026 for Quantum Software
The Quantum Insider
Insider Brief Eclipse Foundation, an open-source quantum programming framework initiated by Fraunhofer FOKUS, won the 2026 Quantum Effects Award in the Quantum Computing Software & Algorithms category. The Python-based framework provides…
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Zumo and Quantum Chain Partner on Quantum-Secure Financial Infrastructure
The Quantum Insider
Insider Brief Zumo and Quantum Chain have partnered to explore quantum-secure financial infrastructure and digital asset applications in the UK. The collaboration will examine integrating Quantum Chain ’s quantum-secure blockchain…
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Quanfluence Raises $10 Million to Build Photonic Quantum Computer
The Quantum Insider
Insider Brief Bengaluru-based Quanfluence has raised $10 million in a funding round led by Chiratae Ventures, with Pi Ventures and Rainmatter by Zerodha participating. The company plans to use the funding to build a full-stack photonic…
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Quantum City Relaunches With Focus on Quantum Training and Careers
The Quantum Insider
Insider Brief Quantum City , the UK National Quantum Technologies Programme’s public engagement initiative, has relaunched with a redesigned website, updated resources and a strategy focused on training and quantum career pathways. Funded…
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Project Eleven Launches Strongpoint for Post-Quantum Digital Asset Custody
The Quantum Insider
Insider Brief Project Eleven launched Strongpoint, an institutional custody platform designed to support digital assets as networks transition to post-quantum cryptography. Zcash Foundation is an initial development partner, contributing…
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Chandigarh University and 247VC Partner on Quantum Startup Investment
The Quantum Insider
Insider Brief Chandigarh University’s CUBIC has become an academic and incubation partner for PRAGATI Q-Foundry 2026 and signed an MoU with 247VC Investment Trust to support quantum and deep-tech startups. The MoU provides a framework for…
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Measurement-free Preparation of Surface-Code States with Digital-Analog Counterdiabatic Drivings
arXiv quant-ph
arXiv:2610.06697v2 Announce Type: replace Abstract: Preparing stabilizer-code states with shallow circuits is an important primitive for near-term quantum error correction in superconducting circuits, where logical-state initialization…
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Energy-constrained two-way capacities of pure-loss and quantum-limited amplifier channels
arXiv quant-ph
arXiv:2610.06832v2 Announce Type: replace Abstract: We determine the two-way quantum, entanglement-distribution, private, and secret-key capacities of the pure-loss bosonic channel under an unconditional mean transmitted-photon-number…
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Better bounds on finite-order Grothendieck constants
arXiv quant-ph
arXiv:2409.03739v4 Announce Type: replace-cross Abstract: Grothendieck constants $K_G(d)$ bound the advantage of $d$-dimensional strategies over $1$-dimensional ones in a specific optimisation task. They have applications ranging from…
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Fermi-pressure-assisted superradiant transition with a mesoscopic Fermi gas in a cavity
arXiv quant-ph
arXiv:2603.08691v2 Announce Type: replace-cross Abstract: We study the superradiant phase transition of a mesoscopic Fermi gas comprising between a few tens and a few thousand $^6$Li atoms in a high-finesse cavity across a wide range of…
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A photonic integrated comb engine for ultracold quantum gases
arXiv quant-ph
arXiv:2609.28294v2 Announce Type: replace-cross Abstract: Cold atoms underpin quantum sensing, simulation and computation, but their coherent control demands highly stable optical fields whose generation, referencing and power scaling…
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Minimal output entropy for the channels that add or remove a box of a Young diagram, and a Pauli principle for every permutation symmetry
arXiv quant-ph
arXiv:2609.33498v2 Announce Type: replace-cross Abstract: Two irreducible representations of $U(d)$ whose Young diagrams differ by a single box are connected by four covariant quantum channels: the box can be removed or added, and one…
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Dynamics of quantum measurement via electron transport in quantum dot systems: many-particle wavefunction approach
arXiv quant-ph
arXiv:2510.05348v2 Announce Type: cross Abstract: Measurement of a charge qubit via point contacts with complex internal structures is considered. In this context, a fully formalized derivation of the many-body wave function method is…
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Black Hole Radiation Decoding in the Haar Random Oracle Model
arXiv quant-ph
arXiv:2610.07124v1 Announce Type: new Abstract: We prove optimal query bounds for recovering a single qubit from black-hole radiation in the Haar random oracle model, when the remaining black hole contains at most one sixteenth of the…
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Kardar-Parisi-Zhang superdiffusion in chaotic quantum circuits
arXiv quant-ph
arXiv:2610.07143v1 Announce Type: new Abstract: We construct a family of chaotic brickwork quantum circuits exhibiting superdiffusive transport with dynamical exponent $z=3/2$ in the full Kardar--Parisi--Zhang (KPZ) universality class…
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Analytic construction of dimension-dependent steering witnesses from generalized equiangular measurements
arXiv quant-ph
arXiv:2610.07314v1 Announce Type: new Abstract: We construct a dimension-dependent family of generalized equiangular measurements that gives explicit steering witnesses in every prime dimension $d\geq5$. The construction consists of $d-1$…
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Spectroscopy using dipole-phonon quantum logic
arXiv quant-ph
arXiv:2610.07680v1 Announce Type: new Abstract: Dipole-phonon quantum logic (DPQL) offers novel approaches for state preparation, measurement, and control of quantum information in molecular ion qubits. Here we report the first…
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Cyclic triorthogonal codes in prime dimension
arXiv quant-ph
arXiv:2610.08012v1 Announce Type: new Abstract: We study cyclic triorthogonal codes in prime dimension $p$, on which a transversal third-level diagonal gate acts as a logical non-Clifford gate. For odd $p$, we use a definition of…
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Memory Separations from a Collective-Spin Quantum Register
arXiv quant-ph
arXiv:2610.08038v1 Announce Type: new Abstract: A spin one-half driven only by total-spin operators generates a renewal process in which one interevent time $n^\ast$ is forbidden while all others occur. No classical hidden Markov model…
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Total Ordering of Resources: A Quantum-Classical Separation
arXiv quant-ph
arXiv:2610.08062v1 Announce Type: new Abstract: A central goal in quantum information science is understanding which physical states can be converted into others. The ideal scenario would be a totally ordered system, where every state can…
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Post-Selection-Free Quantum Automated Learning
arXiv quant-ph
arXiv:2610.08219v1 Announce Type: new Abstract: Quantum automated learning (QAL) trains quantum models by directly updating quantum states, offering an approach to quantum machine learning that avoids optimizing variational circuit…
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Quantifying the fidelity of a quantum memory
arXiv quant-ph
arXiv:2610.08445v1 Announce Type: new Abstract: Quantum memories are key ingredients for future quantum networks. Developing methods for their certification is therefore an important, yet challenging, problem. In this work, we present a…
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Quantum algorithms for four problems in density peak clustering
arXiv quant-ph
arXiv:2610.08498v1 Announce Type: new Abstract: Clustering is a fundamental task in unsupervised learning. The goal is to partition unlabeled data into clusters such that similar elements are assigned to the same cluster, while elements in…
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Exact Catalysis Cannot Overcome the Gaussian-Steering Barrier for Remote Wigner Negativity
arXiv quant-ph
arXiv:2610.08509v1 Announce Type: new Abstract: Gaussian steering sets a sharp threshold for creating Wigner negativity at a distance. A measurement by Bob can make Alice's part of a shared Gaussian state Wigner negative only if Alice can…
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Entanglement manipulation and magic area-laws
arXiv quant-ph
arXiv:2610.08727v1 Announce Type: new Abstract: Physical many-body quantum systems typically interact locally, giving rise to ground states where entanglement grows with the area of the region being probed. Beyond entanglement…
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Chiral Parafermions in Floquet $\mathbb{Z}_N$ Topological Order
arXiv quant-ph
arXiv:2610.07156v1 Announce Type: cross Abstract: Floquet topological order (FTO) extends topology beyond equilibrium, giving rise to phenomena, such as the dynamical transmutation of anyons. Here, we realize $\mathbb{Z}_N$ FTO in a…
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Quantum Algorithms for Finding Vacua in the ADK Landscape
arXiv quant-ph
arXiv:2610.07439v1 Announce Type: cross Abstract: We study quantum algorithms for finding a vacuum with a small cosmological constant in the toy model for string Landscape proposed by Arkani-Hamed, Dimopoulos, and Kachru. First, we…
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Coupled cluster theory for multireference and open-shell molecules
arXiv quant-ph
arXiv:2610.07440v1 Announce Type: cross Abstract: We introduce a simple coupled cluster approach for multireference and open-shell systems. In the restricted active space coupled cluster framework, the cluster operator only includes…
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Sparse qubit operation in a 6$\times$6 quantum dot array
arXiv quant-ph
arXiv:2610.07683v1 Announce Type: cross Abstract: Fault-tolerant quantum computation requires increasing the qubit count while maintaining high performance and connectivity. Semiconductor qubits have demonstrated high-fidelity operation…
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Horizon-Scale Corrections to Black Hole Geometry from a Conserved Quantum Atmosphere
arXiv quant-ph
arXiv:2610.07934v1 Announce Type: cross Abstract: Black holes are usually described either as classical geometries on which quantum fields propagate or as objects whose complete quantum description lies beyond semiclassical gravity…
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Gaussian optical networks for one-dimensional anyons
arXiv quant-ph
arXiv:2012.12967v2 Announce Type: replace Abstract: We study the dynamics of bosonic and fermionic anyons defined on a one-dimensional lattice, under the effect of Hamiltonians quadratic in creation and annihilation operators, also called…
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Quantum Walks on Arbitrary Spatial Networks with Rydberg Atoms
arXiv quant-ph
arXiv:2507.21011v2 Announce Type: replace Abstract: Rydberg atoms provide a highly promising platform for quantum computation, leveraging their strong tunable interactions to encode and manipulate information in the electronic states of…
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Fusion rules of mobility
arXiv quant-ph
arXiv:2508.13961v3 Announce Type: replace Abstract: In topological phases of matter, fusion rules dictate how anyonic topological charges combine. However, the transformation of quasiparticle mobility under fusion remains largely…
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Imperfect blockade in Rydberg superatoms
arXiv quant-ph
arXiv:2601.18506v2 Announce Type: replace Abstract: Ensembles of atoms interacting via their Rydberg levels, known as "superatoms" for their ability to encode qubits and to emit single photons, attract increasing attention as building…
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Quantum Chaos and Eigenstate Thermalization
arXiv quant-ph
arXiv:2604.11872v4 Announce Type: replace Abstract: We provide a pedagogical introduction to eigenstate thermalization. This phenomenon, which occurs in generic quantum many-body systems, allows one to understand why thermalization takes…
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How To Track Qubits Through Space and Time (Or: Sailing in a Quantum Boat)
arXiv quant-ph
arXiv:2605.30732v2 Announce Type: replace Abstract: While quantum position verification aims to certify a prover's location using quantum information, existing security definitions only guarantee that part of the successful adversarial…
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Dissipation-induced Sachdev-Ye-Kitaev physics in many-body cavity quantum electrodynamics
arXiv quant-ph
arXiv:2608.23557v2 Announce Type: replace Abstract: We show that cavity quantum electrodynamics (QED) devices can realize dissipative Sachdev-Ye-Kitaev (SYK) universality, a paradigmatic setting for quantum chaos in open many-body systems…
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Dynamical regimes of QAOA gradient response
arXiv quant-ph
arXiv:2609.01280v2 Announce Type: replace Abstract: Characterizing the trainability of the Quantum Approximate Optimization Algorithm (QAOA) requires understanding how its gradient landscape changes across circuit parameters and problem…
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Quantum error-correcting code parameters, checkable by a certificate of provable size
arXiv quant-ph
arXiv:2610.03214v2 Announce Type: replace Abstract: Quantum error correction protects quantum information by encoding it in a code described by three numbers: how many physical qubits it uses, how many logical qubits it protects, and the…
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Distributional Quantum Query Complexity
arXiv quant-ph
arXiv:2610.06835v2 Announce Type: replace Abstract: Quantum query complexity enjoys a variety of pleasing joint computation properties: for example, a composition theorem asserting $Q(f\circ g)=\Theta(Q(f)Q(g))$ for all Boolean functions…
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$K$-Theoretic Obstructions to Linearizing QCA Representations
arXiv quant-ph
arXiv:2606.19657v2 Announce Type: replace-cross Abstract: Projective representations arise naturally in physics and representation theory, and determining whether they can be linearized has been a fundamental problem. In this work, we…
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Large Deviations for the Bose--Einstein Condensate of the Ideal Gas in the Canonical Ensemble
arXiv quant-ph
arXiv:2608.26378v3 Announce Type: replace-cross Abstract: We consider a non-interacting Bose gas governed by a general one-particle Hamiltonian in the canonical ensemble. Our main results are large-deviation estimates for the number of…
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Searching for Bell-CHSH-Violating Bose Operators
arXiv quant-ph
arXiv:2609.05685v2 Announce Type: replace-cross Abstract: We construct bounded Bell observables for a free scalar field in complementary spacetime wedges using measurable involutions of the spectral variable of a local canonical…
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Stabilizing an optical cavity containing a bulk diamond crystal at millikelvin temperatures in a cryogen-free dilution refrigerator
arXiv quant-ph
arXiv:2501.18938v2 Announce Type: replace Abstract: We successfully stabilized a Fabry-P\'erot optical cavity incorporating a bulk diamond crystal at millikelvin temperatures in a cryogen-free dilution refrigerator with the pulse-tube…
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Theory of (Co)homological Invariants on Quantum LDPC Codes
arXiv quant-ph
arXiv:2603.25831v2 Announce Type: replace Abstract: We establish a systematic mathematical framework for constructing and computing (co)homological invariants that induce logical gates on quantum low-density parity-check (qLDPC) codes. By…
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Inertial Counterdiabatic Driving
arXiv quant-ph
arXiv:2610.08235v1 Announce Type: new Abstract: We introduce an inertial counterdiabatic (CD) protocol that reformulates shortcut-to-adiabaticity design as a moving-frame diagonalization problem. The method employs the Magnus expansion to…
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Protecting bosonic codes from ancilla-induced errors with continuous-variable flags
arXiv quant-ph
arXiv:2610.07139v1 Announce Type: new Abstract: Bosonic quantum error correction represents a route towards significant hardware overhead reduction for fault-tolerant quantum computation. However, controlling quantum harmonic oscillators…
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Polaronic Response of a Supersonic Impurity Strongly Coupled to a Bose Condensate
arXiv quant-ph
arXiv:2610.07944v1 Announce Type: cross Abstract: How a mobile impurity exchanges momentum and energy with a many-body environment is a central question in nonequilibrium quantum physics. This exchange becomes particularly complex when the…
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Recursive Sketched Interpolation: Efficient Hadamard Products of Tensor Trains
arXiv quant-ph
arXiv:2602.17974v2 Announce Type: replace Abstract: The Hadamard product of two tensors in the tensor-train (TT) format is a fundamental operation across various applications, such as TT-based function multiplication for nonlinear…
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Universal critical $g$ factor for spin-1/2 Aharonov-Bohm bound states
arXiv quant-ph
arXiv:2610.08521v1 Announce Type: new Abstract: Whether the spin-1/2 Aharonov-Bohm Hamiltonian supports bound states has remained controversial since Hagen concluded that no such states exist for a Dirac particle. Here, we show that…
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Real-Space Chemistry on Quantum Computers: A Fault-Tolerant Algorithm with Adaptive Grids and Transcorrelated Extension
arXiv quant-ph
arXiv:2507.20583v2 Announce Type: replace Abstract: First-quantized, real-space formulations of quantum chemistry on quantum computers are appealing: qubit count scales logarithmically with spatial resolution, and Coulomb operators achieve…
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Exact Unitary Synthesis: Simultaneously Optimal in Size and Depth-Ancilla Tradeoff
arXiv quant-ph
arXiv:2610.07010v1 Announce Type: new Abstract: Unitary synthesis underlies universal quantum computation by translating unitary transformations into circuits of elementary gates. We show that for any budget $m\geq 0$ of ancilla, every…
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Decoupling Spectral Gaps from Entanglement Complexity in Quantum Annealing
arXiv quant-ph
arXiv:2610.07144v1 Announce Type: new Abstract: Exponentially small spectral gaps are the central obstacle to adiabatic quantum annealing, yet whether such bottlenecks demand correspondingly complex entanglement remains unclear. We show…
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Advantage of Entangled Learning Rules in Quantum Measurement Class Learning
arXiv quant-ph
arXiv:2610.07328v1 Announce Type: new Abstract: Learning with data in the form of quantum states is of current interest and has led to a variety of problems that boil down to interaction with the available data via quantum measurement and…
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Divisibility of Non-Invertible Quantum Dynamics in the Heisenberg Picture
arXiv quant-ph
arXiv:2610.07986v1 Announce Type: new Abstract: We study divisibility of finite-dimensional quantum dynamics in the Heisenberg picture when the dynamical maps need not be invertible. Heisenberg divisible dynamics determines unique reduced…
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Fault-tolerant resource estimation for ground-state preparation via Lindblad simulation
arXiv quant-ph
arXiv:2610.08667v1 Announce Type: new Abstract: Recent advances in algorithms for simulating Lindblad dynamics have clarified their theoretical potential for state preparation, but their practicality in the early fault-tolerant regime and…
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Entanglement Sudden Death: Eberly's Work and the Limits of Local Dynamics
arXiv quant-ph
arXiv:2610.08710v1 Announce Type: new Abstract: Entanglement sudden death (ESD), explored through a series of works by Yu and Eberly, supports the notion of entanglement vanishing abruptly and completely at a finite time, even when the…
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Symmetry protected quantum many body scars through half-gauging
arXiv quant-ph
arXiv:2610.08304v1 Announce Type: cross Abstract: We study the interplay between symmetry defects insertion and the phenomena of quantum many body scarring. We exploit a class of models obtained from an embedding mechanism that defines a…
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The Concept of Entropic Time: A Preliminary Discussion
arXiv quant-ph
arXiv:2011.00499v3 Announce Type: replace Abstract: The deep connection between entropy and information is discussed in terms of both classical and quantum physics. The mechanism of information transfer between systems via entanglement is…
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Improved local models and new Bell inequalities via Frank-Wolfe algorithms
arXiv quant-ph
arXiv:2302.04721v4 Announce Type: replace Abstract: In Bell scenarios with two outcomes per party, we algorithmically consider the two sides of the membership problem for the local polytope: constructing local models and deriving…
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Markov Chain Model of Entanglement Setup in Noisy Dynamic LEO Satellite Networks
arXiv quant-ph
arXiv:2512.20047v4 Announce Type: replace Abstract: Quantum entanglement routing in dynamic Low Earth Orbit (LEO) satellite networks is important for achieving scalable and high-fidelity quantum communication. However, the dynamic…
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Carnot Meets Quantum Information: A Thermal Machine Driven by Non-orthogonal State Discrimination
arXiv quant-ph
arXiv:2608.16623v2 Announce Type: replace Abstract: While the impossibility of perfectly identifying non-orthogonal states is a cornerstone of quantum information science, they can nevertheless be distinguished with a finite error…
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Finer sub-Planck structures and displacement sensitivity of SU(1,1) circular states
arXiv quant-ph
arXiv:2602.14752v3 Announce Type: replace Abstract: Quantum states with sub-Planck features exhibit sensitivity to phase-space displacements beyond the standard quantum limit, making them useful for quantum metrology. In the context of the…
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A non-robust quantum correlation self-test
arXiv quant-ph
arXiv:2609.25117v2 Announce Type: replace Abstract: We show that exact self-testing of a quantum correlation does not imply robust self-testing. Man\v{c}inska and Schmidt previously established such a separation for non-local games, but…
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Parallelizable and addressable transversal non-Clifford gates on good quantum LDPC codes
arXiv quant-ph
arXiv:2609.26691v3 Announce Type: replace Abstract: We achieve linearly many parallelizable and addressable transversal logical multi-controlled-Z gates with asymptotically optimal parameters simultaneously on good quantum low-density…
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An operational characterization of finite-dimensional quantum theory
arXiv quant-ph
arXiv:2610.03694v2 Announce Type: replace Abstract: A key goal in the foundations of quantum mechanics is to identify operational constraints characterizing physical theories. Bell inequalities do so for classical probability theory, while…
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Quantum Gibbs State Preparation via Relative Decoding: From Fast-Mixing Sources to Broader Target Classes
arXiv quant-ph
arXiv:2610.06667v2 Announce Type: replace Abstract: Provable guarantees for preparing quantum Gibbs states, such as rapid mixing or gapped coherent preparation paths, are known only for restricted Hamiltonian families and usually must be…
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Integrated on-chip quantum light sources on a van der Waals platform
arXiv quant-ph
arXiv:2512.15337v2 Announce Type: replace-cross Abstract: Scalable photonic quantum information technologies require a platform combining quantum light sources, waveguides, and detectors on a single chip. Here, we introduce a van der Waals…
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The Normalised Wigner Negativity Rate as a Second-Moment Probe of Infall in AdS$_3$
arXiv quant-ph
arXiv:2607.04065v3 Announce Type: replace-cross Abstract: In spread complexity, the growth rate of the average position of a time-evolved state along its Krylov chain recovers the proper radial momentum of an infalling particle in AdS. It…
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Storage, Scrambling, and Loss of Information in Quantum Reservoir Computing
arXiv quant-ph
arXiv:2608.07677v3 Announce Type: replace Abstract: The performance of a quantum reservoir computer in temporal processing tasks depends on how its driven quantum substrate retains information about past inputs, distributes it across…
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Operational quasiprobability formulation of non-signaling in time for macrorealism violations
arXiv quant-ph
arXiv:2610.08146v1 Announce Type: new Abstract: In this paper, we introduce the concept of quasi non-signaling in time (QNSIT), which extends non-signaling in time (NSIT) to quasiprobability distributions. QNSIT requires that the marginals…
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A General Framework for Gradient-Based Optimization of Superconducting Quantum Circuits using Qubit Discovery as a Case Study
arXiv quant-ph
arXiv:2408.12704v2 Announce Type: replace Abstract: Engineering the Hamiltonian of a quantum system is fundamental to the design of quantum systems. Automating Hamiltonian design through gradient-based optimization can dramatically…
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Practical block encodings of matrix polynomials that can also be trivially controlled
arXiv quant-ph
arXiv:2601.18767v2 Announce Type: replace Abstract: Quantum circuits naturally implement unitary operations on input quantum states. However, non-unitary operations can also be implemented through "block encodings", where additional…
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Classical Verification of a Remote Quantum Processor via Degenerate Concordant Computations: An Application to Randomness Generation
arXiv quant-ph
arXiv:2610.08185v1 Announce Type: new Abstract: A client who rents a cloud quantum processor cannot easily tell whether the bitstrings it receives came from a quantum device. Certification by random circuit sampling runs on present…
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Connectivity Controls Variational Accessibility in Symmetry-Preserving Quantum Circuits
arXiv quant-ph
arXiv:2610.07173v1 Announce Type: new Abstract: Designing expressive quantum circuits for the variational quantum eigensolver (VQE) is a central challenge in simulating interacting many-body systems. Even symmetry-preserving (SP) circuits…
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Classical chaotic signatures in Krylov space
arXiv quant-ph
arXiv:2610.07352v1 Announce Type: new Abstract: In recent years, Krylov space approaches have emerged as a useful framework for characterizing dynamical chaos in a wide variety of physical systems. However, the connection between Krylov…
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White paper: 1-10 Hz matter-wave interferometer to test the spin entanglement witness for quantum gravity
arXiv quant-ph
arXiv:2610.07422v1 Announce Type: new Abstract: In this white paper, we highlight the importance of the ($1-10~{\rm Hz}$) frequency range for laboratory tests of the quantum nature of gravity using the quantum gravity-induced entanglement…
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X2C-inspired approximation of the Dirac coupling operator in a multiwavelet basis
arXiv quant-ph
arXiv:2610.07512v1 Announce Type: new Abstract: We present a method to obtain the proven exact 2-component (X2C) method, normally applied to Gaussian-type fixed Hilbert bases, in an adaptative non-uniform grid basis of the Hilbert space…
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Quantum Data Ruler
arXiv quant-ph
arXiv:2610.07827v1 Announce Type: new Abstract: A ruler reads an unknown length against a calibrated scale. The quantum data ruler reads a matrix element of an unknown state against the signal of a known reference, from their ratio. It is…
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Charging Dicke and Tavis--Cummings quantum batteries with a $\mathcal{PT}$-symmetric lossy--gain cavity pair
arXiv quant-ph
arXiv:2610.07921v1 Announce Type: new Abstract: We study how a parity--time-symmetric photonic environment changes the charging of Dicke and Tavis--Cummings quantum batteries. For atoms prepared in the collective ground state the…
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Entanglement Swapping Scheduling for Quantum Repeater Chains under Decoherence during Classical Communications
arXiv quant-ph
arXiv:2610.07991v1 Announce Type: new Abstract: First-generation quantum repeaters are essential in distributing entanglement over long distances since they could mitigate losses in optical fiber. Repeaters split the total distance into…
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Quantum convolutional neural networks for jet images classification
arXiv quant-ph
arXiv:2408.08701v4 Announce Type: replace Abstract: Recently, interest in quantum computing has significantly increased, driven by its potential advantages over classical techniques. Quantum machine learning (QML) exemplifies one of the…
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Indefinite causal order in cavity quantum electrodynamics
arXiv quant-ph
arXiv:2509.02209v2 Announce Type: replace Abstract: Indefinite causal order (ICO) has the potential to be a new resource for quantum information processing. In most of its experiments, ICO has been investigated in a photonic platform. Here…
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Poincar\'e Duality and Multiplicative Structures on Quantum Codes
arXiv quant-ph
arXiv:2512.21922v3 Announce Type: replace Abstract: Quantum LDPC codes have attracted intense interest due to their advantageous properties for realizing efficient fault-tolerant quantum computing. In particular, sheaf codes represent a…
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Exploring Bell Nonlocality with Extremal Non-Signaling Boxes
arXiv quant-ph
arXiv:2601.08924v2 Announce Type: replace Abstract: Extremal non-signaling (ENS) boxes are correlations that correspond to vertices of the non-signaling polytope of a Bell scenario. Neither quantum theory nor any theory for ideal…
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Quantum interference between spectral bandwidth mismatched photons
arXiv quant-ph
arXiv:2601.12129v2 Announce Type: replace Abstract: Two-photon interference is a cornerstone of photonic quantum technologies. However, its practical use in hybrid architectures is constrained by the need for photon indistinguishability…
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Magic Secret Sharing: Threshold Control of Quantum Computational Power via GHZ Entanglement
arXiv quant-ph
arXiv:2605.16614v5 Announce Type: replace Abstract: We introduce Magic Secret Sharing (MSS), a quantum cryptographic primitive in which the secret is the computational capability of a quantum state rather than its classical description. In…
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Improved quantum sampling methods for molecular simulations
arXiv quant-ph
arXiv:2608.11569v2 Announce Type: replace Abstract: Quantum-selected configuration interaction (QSCI) methods use a quantum computer to identify dominant electronic configurations in the molecular ground state, while a classical computer…
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"Train classical, deploy quantum" requires rethinking generalization
arXiv quant-ph
arXiv:2608.31117v2 Announce Type: replace Abstract: Generative models have become central across science and industry, from image and text synthesis to the design of molecules and materials. Quantum generative models are considered one of…
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The classical capacity of generalized amplitude-damping channels and its strong-converse exponent
arXiv quant-ph
arXiv:2609.14621v2 Announce Type: replace Abstract: The classical capacity of a quantum channel generally requires regularization because input codewords may be entangled across channel uses. We remove this regularization for generalized…
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Quantum data loading from the learned shared structure of real signals
arXiv quant-ph
arXiv:2610.06076v2 Announce Type: replace Abstract: Preparing quantum states from classical data can cost more than the computation they serve; most loaders tailor a circuit to each input. Here we show that the signals of a real dataset…
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Modular Aggregation as a Debiasing Method for Non-Stationary Discrete Sources: Convergence and Numerical Validatio
arXiv quant-ph
arXiv:2504.18585v3 Announce Type: replace-cross Abstract: We analyze \emph{modular aggregation}---summing $N$ independent outcomes modulo $m$---as a post-processing method for extracting nearly uniform randomness from biased discrete…
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Superextensive charging speeds in a correlated quantum charger
arXiv quant-ph
arXiv:2601.02477v2 Announce Type: replace-cross Abstract: We define a quantum charger as an interacting quantum system that transfers energy between two drives. The key figure of merit characterizing a charger is its charging power…
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Puiseux series about exceptional singularities dictated by symmetry-allowed Hessenberg forms of perturbation matrices
arXiv quant-ph
arXiv:2603.25603v2 Announce Type: replace-cross Abstract: We develop a systematic framework for determining the nature of exceptional points of $n^{\rm th}$ order (EP$_n$s) in non-Hermitian (NH) systems, represented by complex square…
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Spin Qubit Leapfrogging: Dynamics of shuttling electrons on top of another
arXiv quant-ph
arXiv:2604.13760v2 Announce Type: replace-cross Abstract: Spin shuttling has crystalized as a powerful and promising tool for establishing intermediate-range connectivity in semiconductor spin-qubit devices. Although experimental…
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Optimal GHZ extraction from MABK violations
arXiv quant-ph
arXiv:2610.08516v1 Announce Type: new Abstract: We determine the least Greenberger-Horne-Zeilinger (GHZ) extractability compatible with a Mermin-Ardehali-Belinskii-Klyshko (MABK) Bell score for every number of parties greater than two…
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Pauli Decomposition by Character Theory: A Memory-Bounded Algorithm for Qubits and Qudits
arXiv quant-ph
arXiv:2610.08299v1 Announce Type: new Abstract: Pauli decomposition underpins Trotterization, phase estimation, sparse-Hamiltonian simulation, and variational observables, at exponential naive cost. From the character theory of…
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Error bounds for composite quantum hypothesis testing and a new characterization of the weighted Kubo-Ando geometric means
arXiv quant-ph
arXiv:2503.13379v5 Announce Type: replace Abstract: The optimal error exponents of binary composite i.i.d.~state discrimination are trivially bounded by the worst-case pairwise exponents of discriminating individual elements of the sets…
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Measurement Complexity of Quantum Compressed Sensing
arXiv quant-ph
arXiv:2610.08234v1 Announce Type: new Abstract: Conventional compressed sensing (CS) has a measurement lower bound of M = {\Omega}(K log(N/K)) under non-adaptive measurements. Recent experiments on quantum compressed sensing (QCS) have…
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Quantum Algorithms for Multivariable Polynomial Transformations: From Efficient Synthesis to Quantum Channel Transformations
arXiv quant-ph
arXiv:2610.08714v1 Announce Type: new Abstract: Polynomial transformations are basic primitives in quantum algorithms: quantum signal processing and singular value transformation compile univariate polynomials into circuits with query…
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A Single Conformal Coordinate Decodes Outcome-Resolved Measurement-Induced Entanglement
arXiv quant-ph
arXiv:2610.07995v1 Announce Type: new Abstract: A local measurement of a critical many-body state produces exponentially many microscopic outcomes, each defining a different conditioned quantum state. We ask how much information from one…
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Efficient Learning of Structured Fermionic States under General Quadratic Evolution
arXiv quant-ph
arXiv:2610.08723v1 Announce Type: new Abstract: We prove that unknown pure fermionic states prepared from disjoint-branch fixed-particle-number blocks can be reconstructed after general quadratic evolution, including pair creation and…
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The parliament of observers - Against the observable axiom of quantum mechanics
arXiv quant-ph
arXiv:2610.07254v1 Announce Type: new Abstract: The 'unreasonable effectiveness of mathematics in the natural sciences' may at times give the impression that natural science, especially modern theoretical physics, is all but a formal…
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Multi-time advantage for certifying quantum coherence
arXiv quant-ph
arXiv:2610.08241v1 Announce Type: new Abstract: Non-classical dynamics in open quantum systems can be hidden in temporal correlations that are invisible to standard state- and channel-based tests. We define coherence for multi-time quantum…
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Quantum Machine Learning for Few-Shot Impersonation Detection in Digital Account Opening
arXiv quant-ph
arXiv:2610.07242v1 Announce Type: new Abstract: Identity impersonation fraud may emerge only after digital account opening, requiring an early post-onboarding approach based on behavioral and transactional signals observed shortly after…
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A 3D-Printed GHz Microwave-Resonator Paul Trap for Electron Confinement and Millisecond Spin-Qubit Coherence
arXiv quant-ph
arXiv:2610.08411v1 Announce Type: new Abstract: We report a 3D-printed microwave-resonator Paul trap that operates at the GHz frequencies required for electron confinement while preserving an open geometry suitable for laser access and…
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Spectral Certificates and Non-commutative Sum-of-Squares Lower Bounds for Hamiltonians
arXiv quant-ph
arXiv:2511.02264v4 Announce Type: cross Abstract: A central question in quantum many-body physics is estimating the ground energy of a $k$-local Hamiltonian system. In this work, we present a spectral technique for certifying a lower bound…
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Spontaneous Hawking Radiation from Dynamical Black-Hole Formation in Quantum Spin Systems
arXiv quant-ph
arXiv:2610.07794v1 Announce Type: cross Abstract: We show that Hawking radiation spontaneously generated by dynamical black-hole formation can be realized in a local quantum spin model. Starting from the ground state corresponding to the…
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Quantum Entangled Multimodal Fusion Networks (QEMFN): Resource-Aware Hybrid Vision-Language Fusion via Trainable Entanglement
arXiv quant-ph
arXiv:2610.08216v1 Announce Type: cross Abstract: Multimodal vision-language systems typically fuse image and text embeddings through classical operators such as concatenation, attention, bilinear pooling, or tensor interactions. We…
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Boosting the photon bunching of classical light via a modified Fabry-P\'erot cavity
arXiv quant-ph
arXiv:2610.08269v1 Announce Type: cross Abstract: We proposed to boost the photon bunching effect of classical light via a modified Fabry-P\'erot cavity with one of the cavity mirrors being replaced by a spatial light modulator, through…
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Perfect state transfer on mixed graphs: complete classes and transfer times
arXiv quant-ph
arXiv:2610.08333v1 Announce Type: cross Abstract: For perfect state transfer (PST) on unweighted mixed graphs, we classify the normalized transfer times of complete PST classes. A finite set $\Lambda\subset\mathbb R/\mathbb Z$ containing…
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Solving larger Travelling Salesman Problem networks with a penalty-free Variational Quantum Algorithm
arXiv quant-ph
arXiv:2512.06523v3 Announce Type: replace Abstract: The Travelling Salesman Problem (TSP) is a well-known NP-hard combinatorial optimisation problem with important industrial applications. Although extensively studied, quantum solutions…
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A Cross-Platform Analysis of Practical Quantum Error Correction Codes
arXiv quant-ph
arXiv:2607.04082v2 Announce Type: replace Abstract: The theory of quantum error correction was established decades ago. Yet limitations in physical noise levels and available physical-qubit counts continue to hinder the development of…
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Proposal for matter-wave interferometry with a rare-earth-doped microparticle
arXiv quant-ph
arXiv:2609.38564v2 Announce Type: replace Abstract: Matter-wave interferometers are sensitive probes of low energy physics and have been used for precise tests of gravity and quantum mechanics. These applications would benefit from…
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Variational quantum-algorithm based self-consistent calculations for the two-site DMFT model on noisy quantum computing hardware
arXiv quant-ph
arXiv:2311.10402v3 Announce Type: replace-cross Abstract: Dynamical Mean Field Theory (DMFT) is one of the powerful computational approaches to study electron correlation effects in solid-state materials and molecules. Its practical…
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The Grothendieck Constant is Strictly Larger than Davie-Reeds' Bound
arXiv quant-ph
arXiv:2603.30039v2 Announce Type: replace-cross Abstract: The Grothendieck constant $K_{G}$ is a fundamental quantity in functional analysis, with important connections to quantum information, combinatorial optimization, and the geometry…
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Perturbation Theory for Time-Dependent Point Interactions with Discrete Spectrum
arXiv quant-ph
arXiv:2608.08108v2 Announce Type: replace-cross Abstract: We develop a perturbative framework for time-dependent point interactions in quantum systems with purely discrete unperturbed spectrum. In two and three dimensions the point…
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Connecting the tensor-categorical formulation of anyon condensation with operator algebras and entropic order parameters
arXiv quant-ph
arXiv:2608.12157v3 Announce Type: replace-cross Abstract: Anyon condensation that describes the transition between topological quantum field theories can be formulated in the language of tensor categories or that of operator algebras. We…
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Quantum Darwinism through apparatus-mediated environmental recording
arXiv quant-ph
arXiv:2610.07568v1 Announce Type: new Abstract: Quantum Darwinism explains classical objectivity through redundant environmental records of a system's pointer states. We show that these records can be established through an intermediate…
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Quantum telescopy with realistic anti-correlated optical fields as references
arXiv quant-ph
arXiv:2610.07806v1 Announce Type: new Abstract: Quantum telescopy, proposed by Grottesman et al., uses spatially entangled single-photon states to modify HBT stellar interferometry, potentially surpassing Michelson interferometry in…
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Observing the magic Mpemba effect in localized dynamics on a digital quantum computer
arXiv quant-ph
arXiv:2610.08769v1 Announce Type: new Abstract: The Mpemba effect challenges the intuition that states closer to equilibrium must relax faster. We ask whether an analogous magic-ordering reversal can occur in the generation of quantum…
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Achieving precision in measuring birefringence characteristics of a periodically-poled Lithium Niobate waveguide
arXiv quant-ph
arXiv:2504.04899v3 Announce Type: cross Abstract: The refraction of light in an optical medium is not only a subject of fundamental interest, but the refractive index also plays a crucial role in applications involving integrated and…
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Pauli Error Composition Determines the Multipartite Advantage in Conference Key Agreement
arXiv quant-ph
arXiv:2610.07251v1 Announce Type: new Abstract: GHZ-based conference key agreement distributes a shared key to $N$ parties in one network use, whereas pairwise BB84 needs $N-1$. The survival of that advantage has been studied against party…
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When Expressivity Is Not Enough: Discrete Routing Geometry in Variational Quantum Circuits
arXiv quant-ph
arXiv:2610.07697v1 Announce Type: new Abstract: Finding useful variational quantum circuits requires more than representational capacity: training must also have access to directions that improve the objective. We study how discrete CNOT…
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Demonstration of Parallel Multi-QPU Execution for Fragment-Based Quantum Chemistry Using On-Premises Hardware
arXiv quant-ph
arXiv:2610.07702v1 Announce Type: new Abstract: Fragment molecular orbital (FMO) quantum chemistry offers a natural route to parallel quantum computing: large molecular calculations can be decomposed into smaller quantum subproblems that…
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Broadband Telecom Entanglement from an All-Fiber Type-0 Sagnac Source
arXiv quant-ph
arXiv:2610.08025v1 Announce Type: new Abstract: We demonstrate a compact, practical all-fiber source of non-degenerate telecom-band polarization-entangled photon pairs assembled from off-the-shelf components. The compact fiber-integrated…
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Magnus: neutrino oscillation probabilities for any Hermitian Hamiltonian, any number of flavors, and any matter profile
arXiv quant-ph
arXiv:2610.07159v1 Announce Type: cross Abstract: Interpreting neutrino oscillation measurements requires computing the probability that a neutrino born with one flavor is detected with another. In vacuum and in matter of constant density…
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Analytical results for the Shannon entropy of the critical transverse-field Ising chain
arXiv quant-ph
arXiv:2610.08591v1 Announce Type: cross Abstract: Local-basis Shannon entropies of critical wave functions contain universal subleading information, but the Shannon point of the critical transverse-field Ising chain is singular in the…
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Tunable spectral correlations of highly multimode visible light via broadband quantum frequency conversion
arXiv quant-ph
arXiv:2401.06119v2 Announce Type: replace Abstract: Multimode squeezed states of light are a resource for achieving quantum advantage in computing and sensing, where spatial or temporal modes have been the experimental norm. In our…
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Experimental signatures of a $\hat{Z}\hat{X}$ beam-splitter interaction between Kerr-cat and transmon qubits
arXiv quant-ph
arXiv:2511.21972v4 Announce Type: replace Abstract: Quantum error correction (QEC) requires ancilla qubits to extract error syndromes from data qubits which store quantum information. However, ancilla errors can propagate back to the data…
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Square-root growth of operator entanglement in an integrable brickwork circuit
arXiv quant-ph
arXiv:2609.39401v2 Announce Type: replace-cross Abstract: It is widely expected that the von Neumann entanglement of a local operator grows at most logarithmically in integrable many-body systems in infinite volume. We give a…
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Neural Correlation Learning for Quantum-Enhanced Sensing with Time-Independently Driven Rydberg Atom Arrays
arXiv quant-ph
arXiv:2610.06961v1 Announce Type: new Abstract: Quantum-enhanced sensing typically relies on preparing specific entangled states. However, engineering these states in scalable many-body systems remains challenging due to the difficulty of…
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Trace-class spectra of irreducible Gaussian quantum Markov semigroups
arXiv quant-ph
arXiv:2609.06957v2 Announce Type: replace Abstract: We determine the spectrum of the predual generator of an irreducible Gaussian quantum Markov semigroup on trace-class operators, the natural space for density operators. The drift matrix…
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Non-Markovian Quantum Decay in Complex Environments: A Hyperstatistical Approach
arXiv quant-ph
arXiv:2609.22190v2 Announce Type: replace Abstract: The exponential decay of an unstable quantum state, as described by standard Markovian theories such as Fermi's Golden Rule, assumes a simple, structureless environment. However, in…
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Symmetric multipartite Bell inequalities via Frank-Wolfe algorithms
arXiv quant-ph
arXiv:2310.20677v3 Announce Type: replace Abstract: In multipartite Bell scenarios, we study the nonlocality robustness of the Greenberger-Horne-Zeilinger (GHZ) state. When each party performs planar measurements forming a regular polygon…
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Pauli Flat Quantum States Mimicking Maximal Magic
arXiv quant-ph
arXiv:2610.07172v1 Announce Type: new Abstract: Quantum magic is a necessary resource for fault-tolerant quantum computing, capturing the departure of quantum states from the classically simulable stabiliser set. Motivated by its role in…
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Relative-Entropy Flow Across the Page Transition
arXiv quant-ph
arXiv:2610.08397v1 Announce Type: cross Abstract: We develop a computational framework for the quantum relative entropy based on the replica trick and apply it to analyze the evaporation process method of Jackiw-Teitelboim black holes. We…
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Exceptional Points revealed by the integrated imaginary scattering eigenphase
arXiv quant-ph
arXiv:2606.21684v2 Announce Type: replace Abstract: We propose and analytically demonstrate that the eigenphases of the scattering matrix provide direct, phase-sensitive signatures of EPs in open PT-symmetric systems. Using a 1D…
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A quantum optical concept of attosecond pulses: the attoquants
arXiv quant-ph
arXiv:2608.17854v2 Announce Type: replace Abstract: High-harmonic generation (HHG) is conventionally understood to produce attosecond pulse trains only when the emitted harmonics are mutually phase-locked, in accordance with the classical…
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Good Quantum Locally Testable Codes from Lossless Cubical Complexes
arXiv quant-ph
arXiv:2610.00525v2 Announce Type: replace Abstract: Sipser and Spielman constructed LDPC codes from either bipartite \emph{spectral} expanders or one-sided \emph{lossless} expanders. In higher dimensions, \emph{spectral} expansion…