Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Classical probabilistic realisation of quantum double-slit interference
Christof Wetterich·Jul 13, 2026
We demonstrate how the interference effects for a quantum particle in the double-slit experiment can be described by classical probabilities. We investigate a classical field theory for a complex scalar field with probabilistic initial conditions. A ...
VQCSim: When Does Compile-Once Statevector Simulation Beat Generic Quantum Frameworks?
Anton Firc, Martin Perešíni, Vojtěch Mrázek +7 more·Jul 13, 2026
Hybrid quantum-classical machine learning workflows repeatedly evaluate many small parametrized circuits during training and model exploration. In this regime, framework dispatch and orchestration overhead often dominate runtime. Prior simulators acc...
Robust Spin Qubit Coupler via Minimal Kitaev Chain
Jiaan Qi, Hongqi Xu·Jul 13, 2026
While a minimal Kitaev chain is promised to host unprotected Majorana zero modes, its role for spin qubits is relatively underappreciated. Following recent breakthroughs in the fine control of transport behaviors, we propose to use minimal Kitaev cha...
Quantum Simulation of Strongly Correlated Fermion-Phonon Models in Circuit QED
Tim Bode, Riccardo Roma, Stefan Schmitz +4 more·Jul 13, 2026
Gate-based digital quantum simulations offer an exciting new paradigm for studying the many-body physics of strongly correlated systems. In this context, electron-phonon models are challenging for qubit-only quantum simulators, as bosonic degrees of ...
States dressing analysis in a transmon-transmon-bus system
P. A. Gladilovich, R. A. Migdisov, A. V. Sabluk +5 more·Jul 13, 2026
The multi-qubit gates fidelity of superconducting quantum processors can be limited due to the dressing of computational states by noncomputational ones. Here, we experimentally and analytically investigate a transmon-transmon-bus system where the co...
A diode nanocavity for fast, efficient and tunable emission of highly entangled photon pairs and Fourier-transform-limited single photons
Ievgen Brytavskyi, Thomas Oberleitner, Christian Weidinger +16 more·Jul 13, 2026
Deterministic sources of entangled photon pairs and indistinguishable photons are expected to play a key role in photonic quantum technologies. Semiconductor quantum dots are promising candidates due to their on-demand emission and compatibility with...
AtomFlow: An End-to-End FPGA-Based Control Architecture for Neutral Atom Quantum Computers
Xiaorang Guo, Jonas Winklmann, Vengkeat Chea +1 more·Jul 13, 2026
Neutral Atom Quantum Computing (NAQC) is an emerging modality for scalable quantum computation, valued for its long coherence times and the naturally identical atomic qubits. However, one of the main drawbacks is its slow execution rate, dominated by...
Strong Zero Modes in Supersymmetry-Inspired Quantum Circuits
Alberto Zorzato, Pietro Richelli, Jiri Minář +1 more·Jul 13, 2026
We investigate discrete dynamics in quantum circuits with gates corresponding to the S-matrix of a supersymmetric 1+1D quantum field theory. We show that for a brick-wall configuration such circuits support both localized and delocalized dynamically ...
Tunable non-Hermitian skin effect and topological phases in ladders with staggered nonreciprocal inter-leg hopping
Pu-Xuan Li, Qi-Bo Zeng·Jul 13, 2026
We investigate the non-Hermitian skin effect (NHSE) and topological phases in a ladder model with staggered nonreciprocal inter-leg hopping, consisting of an Su-Schrieffer-Heeger (SSH) chain coupled to a normal tight-binding chain. By tuning the syst...
Quantum algorithms for second-order boundary value problems
Lauri Kettunen, Tejas Shinde·Jul 13, 2026
Second-order boundary value problems are central to computational science, yet standard matrix-based numerical formulations can obscure the local geometric structure that quantum circuits may exploit. Here we introduce a framework for explicitly cons...
From Leaves to Clusters: Depth-Efficient SAT-Oracle Synthesis Based on the HRSE Model
Zhihang Li, Wei Zi, Shuai Yang +7 more·Jul 13, 2026
Quantum oracles are a common building block of many quantum algorithms, where circuit depth is a primary cost that directly affects overall performance. Synthesizing oracles for SAT (CNF) formulas under a limited ancilla budget, however, tends to yie...
Symmetry tests for cyclic groups with quantum linear optics
Carlos Navas-Merlo, Juan Carlos García Escartín·Jul 13, 2026
Testing quantum states for symmetries has multiple applications in quantum state comparison or as a primitive in more complex quantum algorithms. We present a method that determines whether an input photonic state is invariant under the action of a c...
Toward Quantum Utility in Correlated Topological Matter: Variational Preparation of Fractional Quantum Hall Manifolds
Sergio F. Expósito, Unai Aseginolaza, Raúl Guerrero-Avilés +3 more·Jul 13, 2026
We investigate the use of variational quantum algorithms to prepare and characterize fractional quantum Hall states on near-term quantum processors. Focusing on the $ν=1/3$ Laughlin phase described by the $V_1$ Haldane pseudopotential, we formulate t...
Moment-based PPT criteria for random bipartite states
Cécilia Lancien, Kieran McShane·Jul 13, 2026
Moment-based relaxations of the positive partial transpose (PPT) criterion have been recently introduced, as a hierarchy of entanglement criteria involving only experimentally accessible quantities of a given bipartite state. The goal of this work is...
Controlling the Inhomogeneous Broadening and Impedance Matching of a Spin Ensemble
Mathieu Couillard, Debdip Guchait, Hiroki Takahashi +1 more·Jul 13, 2026
We control the spectral distribution of a spin ensemble by applying a magnetic field gradient using an anti-Helmholtz coil inside a dilution refrigerator, and demonstrate impedance matching between the ensemble and a transmission line, achieving -50 ...
Information geometric quantification of effective privacy in quantum metrology
Luca Bianchi, Shimpei Yamaguchi, Wojciech Roga +2 more·Jul 13, 2026
Privacy of a quantum metrological protocol concerns the extent to which single parameters can be kept inaccessible to an observer or to other users of the network. In this work, an information geometric framework is developed to quantify privacy and ...
Experimental Observation of Anomalous Complementary Weak Values from Correlated Pairwise Two-State Vectors
Qian Xie, Liang Xu, Lijian Zhang·Jul 13, 2026
Weak values (WVs) arise from weak measurements performed within a time-symmetric formulation of quantum mechanics, where a system is both pre- and post-selected. Anomalous WVs that lie far outside the eigenvalue spectrum of the observable hold both f...
Barium-based Rydberg atom quantum technologies with long Rydberg coherence
Xiao-Feng Shi·Jul 13, 2026
The short Doppler-limited coherence time of the laser-excited Rydberg state, usually orders of magnitude shorter than the lifetime of the Rydberg state, hinders the Rydberg-mediated quantum technologies. Here, we show that a 649~nm~$-$~658~nm two-pho...
Fixed-Protocol Amortized MPS Tomography with Conformalized Predictive Uncertainty
Jian Xu, Delu Zeng, John Paisley +1 more·Jul 13, 2026
Quantum state tomography is sample-starved, and the states one prepares live on a narrow, learnable manifold. A $k{=}0$ prior-only control shows that on concentrated families a prior estimate is already near-optimal, so ``high fidelity at few measure...
Deployment of Entanglement-Based QKD in Financial Infrastructure
Mirela Selimović, Roman Solar, Jonathan Gruner +6 more·Jul 13, 2026
We demonstrate the feasibility of entanglement-based quantum key distribution (eQKD) in high-security financial infrastructure over a 22 km fiber link with 8 dB loss between two data centers using polarization entanglement. The fully automated system...