Papers
Live trends in quantum computing research, updated daily from arXiv.
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Perspectives in and on Quantum Theory
Richard Healey·Apr 2, 2026
I take a pragmatist perspective on quantum theory. This is not a view of the world described by quantum theory. In this view quantum theory itself does not describe the physical world, nor our observatons, experiences or opinions of it. Instead, the ...
Compact system development of efficient quantum-entangled photon sources towards deployable and industrial devices
Yared G. Zena, Moritz Langer, Ahmad Rahimi +9 more·Apr 2, 2026
Entangled photon pair sources are a key enabling technology for quantum communication and networking, yet their deployment beyond laboratory environments is hindered by system-level complexity, limited operational stability, and insufficient industry...
Towards Chemically Accurate and Scalable Quantum Simulations on IQM Quantum Hardware: A Quantum-HPC Hybrid Approach
Anurag K. S. V., Ashish Kumar Patra, Manas Mukherjee +5 more·Apr 2, 2026
We present a large-scale experimental study of quantum-computing-based molecular simulation carried out on IQM's Sirius 24-qubit superconducting processor, utilizing up to 16 operational qubits. The work employs Sample-based Quantum Diagonalization (...
Efficient generation and explicit dimensionality of Lie group-equivariant and permutation-invariant bases
Eloïse Barthelemy, Geneviève Dusson, Camille Hernandez +1 more·Apr 2, 2026
In this article, we propose a practical construction of Lie group-equivariant and permutation-invariant functions of $N$ variables from the knowledge of a one-particle basis that is stable with respect to the group action. The construction is generic...
Quantum-Inspired Geometric Classification with Correlation Group Structures and VQC Decision Modeling
Nishikanta Mohanty, Arya Ansuman Priyadarshi, Bikash K. Behera +1 more·Apr 2, 2026
We propose a geometry-driven quantum-inspired classification framework that integrates Correlation Group Structures (CGR), compact SWAP-test-based overlap estimation, and selective variational quantum decision modelling. Rather than directly approxim...
Universal critical timescales in slow non-Hermitian dynamics
Giorgos Pappas, Diego Bautista Avilés, Luis E. F. Foa Torres +1 more·Apr 2, 2026
Non-Hermitian systems driven along slow parametric loops undergo non-adiabatic transitions whose outcome depends sensitively on the driving speed, yet no explicit formula has been available for the critical timescale $T_{\mathrm{cr}}$ at which these ...
Quantum Networking Fundamentals: From Physical Protocols to Network Engineering
Athanasios Gkelias, Felix T. A. Burt, Kin K. Leung·Apr 2, 2026
The realization of the Quantum Internet promises transformative capabilities in secure communication, distributed quantum computing, and high-precision metrology. However, transitioning from laboratory experiments to a scalable, multi-tenant network ...
Collective quantum tunneling with time-dependent generator coordinate method
Wenmin Deng, Guangping Chen, Ganlong Ding +3 more·Apr 2, 2026
Inspired by the work of McGlynn and Simenel [Phys. Rev. C {\bf 102}, 064614 (2020)], this study investigates the quantum tunneling of two interacting distinguishable particles in two potential wells. We first benchmark the system by reproducing key e...
A Loop-Shaping Approach to Coherent Feedback Control in Cavity Optomechanical Cooling
Aoi Fujimoto, Hiroyuki Ichihara, Rina Kanamoto·Apr 2, 2026
We present a loop-shaping approach to coherent feedback (CF) control. By formulating the coupling between a quantum system and its environment in terms of the noise power spectrum, our method enables direct manipulation of the effective dissipation c...
Phase-enhanced nonreciprocal photon-phonon conversion via coupled optomechanical cavities
Divya Mishra, Parvendra Kumar·Apr 2, 2026
Nonreciprocity, characterized by direction-dependent signal propagation, is fundamental to technologies such as isolators, signal routing, and precision sensing. This letter theoretically demonstrates nonreciprocal phonon transport and the conversion...
Topology-Hiding Connectivity-Assurance for QKD Inter-Networking
Margherita Cozzolino, Stephan Krenn, Thomas Lorünser·Apr 2, 2026
While QKD ensures information-theoretic security at the link level, real-world deployments depend on trusted repeaters, creating potential vulnerabilities. In this paper, we thus introduce a topology-hiding connectivity assurance protocol to enhance ...
Transversal non-Clifford gates on almost-good quantum LDPC and quantum locally testable codes
Yiming Li, Zimu Li, Zi-Wen Liu·Apr 2, 2026
We exhibit nontrivial transversal logical multi-controlled-$Z$ gates on $[\![N,Θ(N),\tildeΘ(N)]\!]$ quantum low-density parity-check codes and $[\![N,Θ(N),\tildeΘ(N)]\!]$ quantum locally testable codes with soundness $\tildeΘ(1)$, combining nearly op...
Curvature-induced bound states in quantum wires
Tim Bergmann, Benjamin Schwager, Jamal Berakdar·Apr 2, 2026
A classical particle under spatial constraints is strictly confined to live on a specific space manifold or path, but this assumption is incompatible with the zero-point fluctuations of a quantum particle. One way to describe quantum mechanics under ...
Topology-Hiding Path Validation for Large-Scale Quantum Key Distribution Networks
Stephan Krenn, Omid Mir, Thomas Lorünser +2 more·Apr 2, 2026
Secure long-distance communication in quantum key distribution (QKD) networks depends on trusted repeater nodes along the entire transmission path. Consequently, these nodes will be subject to strict auditing and certification in future large-scale Q...
Distribution of Bell State Entanglement in Qubit Networks via Collision Models
Mert Doğan, Öner Faruk Ödemiş, Elif Yunt +1 more·Apr 2, 2026
We propose a general scheme to controllably distribute pairwise entanglement in a quantum network of qubits by exploiting environmental ancilla qubits interacting with the network nodes through tunable Hamiltonians. Our approach leverages collision m...
Goos-Hänchen Shift in $\mathcal{PT}$-Symmetric and Passive Cavity Optomechanical Systems
Shah Fahad, Gao Xianlong·Apr 2, 2026
We theoretically investigate the control of the Goos-Hänchen shift (GHS) of a reflected weak probe field in both parity-time ($\mathcal{PT}$)-symmetric and conventional optomechanical systems. The proposed scheme consists of a single optomechanical p...
A Differentiable Physical Framework for Goal-Driven Spin-State Engineering in Magnetic Resonance Spectroscopy
Gaocheng Fu, Shiji Zhang, Kai Huang +4 more·Apr 2, 2026
Magnetic Resonance Spectroscopy (MRS) offers a unique non-invasive window into metabolic processes, yet its potential remains strictly constrained by severe spectral congestion and intrinsic insensitivity. Traditional pulse sequence design, tethered ...
Mechanism for scale-free skin effect in one-dimensional systems
Shu-Xuan Wang·Apr 2, 2026
Non-Hermitian skin effect (NHSE) is one of the most fascinating phenomena in non-Hermitian systems, which refers to enormous eigenstates localize at the boundary exponentially under open boundary condition (OBC). For typical NHSE, the localization le...
Quantum-Enhanced Processing with Tensor-Network Frontends for Privacy-Aware Federated Medical Diagnosis
Hiroshi Yamauchi, Anders Peter Kragh Dalskov, Hideaki Kawaguchi +1 more·Apr 2, 2026
We propose a privacy-aware hybrid framework for federated medical image classification that combines tensor-network representation learning, MPC-secured aggregation, and post-aggregation quantum refinement. The framework is motivated by two practical...
Scalable Ground-State Certification of Quantum Spin Systems via Structured Noncommutative Polynomial Optimization
Jie Wang, David Jansen, Irénée Frerot +3 more·Apr 2, 2026
A fundamental challenge in quantum physics is determining the ground-state properties of many-body systems. Whereas standard approaches, such as variational calculations, consist of writing down a wave function ansatz and minimizing over the possible...