Geometry Dependence of Error Thresholds in Two-Dimensional Toric CodesWe investigate how the lattice geometry influences the error thresholds of two-dimensional toric codes. In the presence of bit- or phase-flip errors, the toric code maps onto the two-dimensional…D. Lessing, A. Langheld, C. Krämer et al.·Sep 7, 2026SaveLearn
Discrete Dirac equation on quantum graphs: A model of a Dirac particle in a branched latticeWe study the one-dimensional time-independent discrete Dirac equation on graphs with discrete edges. Both continuous and discrete formulations of the graphs are considered, with particular focus on…Mashrab Akramov, Carsten Trunk, Davron Matrasulov·Sep 7, 2026SaveLearn
Toward Fault-Tolerant Variational Optimization: QAOA under [[4,2,2]] Error DetectionWe present a partially fault-tolerant implementation of QAOA based on the [[4,2,2]] error-detection code, targeting the Max-Cut problem on a square graph. Our main contribution is a novel…Matteo Robert Child, Emanuele Dri, Giacomo Vitali et al.·Sep 7, 2026SaveLearn
Achieving the Quantum Limits with Twin-Field SensorsContinuous measurements play a fundamental role in quantum experiments, yet understanding and extracting the maximal possible information in a continuous probe signal remains a significant challenge.…Yaohua Li, Fan Yang, Klaus Mølmer·Sep 7, 2026SaveLearn
Stationary states for a particle in a box with slanted wallsThe quantum mechanical problem of a particle in a infinite potential well with slanted walls is studied. The energy eigenvalues are determined by a transcendental equation involving the Airy function…Nivaldo A. Lemos·Sep 7, 2026SaveLearn
High-purity fluorescence photon bundle emission from two separate emittersWe propose a scheme for generating high-purity fluorescence two-photon bundles from two spatially separate two-level emitters, whose correlated excitation is mediated by a strongly driven auxiliary…Zhicai Chen, Jun Xu, Deyi Kong et al.·Sep 7, 2026SaveLearn
Photonic Time-Delayed Quantum Extreme Learning MachineWe propose and numerically simulate a photonic quantum extreme learning machine (QELM) based on non-linear interactions in a time-delay non-linear interferometer with photon-number-resolving…Ekaterina Protsenko, Caterina Vigliar, Francesco Da Ros·Sep 7, 2026SaveLearn
Riemannian Optimization for Multi-Player Quantum Games on Product Unitary ManifoldsQuantum game theory is an extension of classical game theory that uses quantum principles in game theory. The Eisert-Wilkens-Lewenstein (EWL) quantum game is an early example of the two-player…Alireza Habibi, Setareh Maghsudi·Sep 7, 2026SaveLearn
Unitary equivalence of Schrödinger and Heisenberg pictures survives in nonlinear quantum mechanicsThe equivalence of Schrödinger and Heisenberg pictures is often thought to break down in nonlinear quantum mechanics due to the absence of a state-independent unitary propagator. We show that for…Lajos Diósi·Sep 7, 2026SaveLearn
Wavelength-Uniform Quantum Algorithms for Quantum DynamicsOne of the main challenges in quantum simulation is the prohibitive cost of computing its solutions in the semi-classical regime, in which the de Broglie wavelength is small compared with the…Shi Jin, Chuwen Ma·Sep 7, 2026SaveLearn
Multi-copy and Catalytic Superactivation of Genuine Multipartite NonlocalityGenuine multipartite Bell nonlocality (GMNL) aims at capturing correlations between many distant observers that are globally Bell nonlocal. A commonly used definition for GMNL is based on biseparable…Bora Ulu, Mirjam Weilenmann, Nicolas Brunner·Sep 7, 2026SaveLearn
Cat-Code-Protected Controlled Quantum Communication via Non-Local CNOT Gates over Star Quantum NetworksControlled quantum communication enables secure state transfer between a sender and receiver with the assistance of one or more controllers. However, practical implementation over optical fibre…Subham Das, Abhishek Sharma, Kailash S·Sep 7, 2026SaveLearn
Phase estimation in spontaneous nonlinear interferometry for enhanced quantum imagingBicolor quantum imaging can reach, in principle, phase supersensitivity approaching the Heisenberg limit using squeezed light from high-gain parametric down-conversion, but established…Jonas L. Moos, Cristofero Oglialoro, Enno Giese et al.·Sep 7, 2026SaveLearn
Symmetry-resolved tree tensor network analysis of Bell-state discrimination with ancilla-assisted passive linear opticsAncillary photons allow passive linear-optical Bell-state discrimination to exceed the one-half probability of success limit achievable with vacuum auxiliary modes. For a fixed analyzer and ancillary…Anand Kumar, Wojciech Roga, Devendra Kumar Mishra et al.·Sep 7, 2026SaveLearn
Momentum-Space-Engineered Spatial Photonic Ising Machine for Long-Range InteractionsLong-range Ising models (LRIMs) with dense nonlocal and competing interactions are central to statistical physics, quantum simulation, and complex networks. Although the spatial photonic Ising…Haijun Zhou, Hengyang Li, Maolin Wang et al.·Sep 7, 2026SaveLearn
Implementing QESEM's High-Accuracy Error Mitigation on a Quantum Computer: a Water Potential Energy Surface StudyQuantum error mitigation (QEM) is essential for extracting chemically accurate results from near-term quantum hardware. Many widely used QEM methods rely on uncontrolled heuristics whose bias depends…Renato Olarte Hernandez, Emanuele Rossi, Sonia Coriani et al.·Sep 7, 2026SaveLearn
Spectral Criterion for Disorder-Free Localization of Quantum Walks on Hypercube: QBN ApproachWe study disorder-free localization in a spin-coupled quantum walk on the hypercube within the quantum Bernoulli noises framework. We derive a general criterion for disorder-free localization: it…Ce Wang·Sep 7, 2026SaveLearn
Qubit-Based Benchmarking of InP HEMT LNAs: Readout Fidelity Versus Power ConsumptionHigh-fidelity single-shot readout of superconducting qubits is essential for fault-tolerant quantum computation. Without a quantum-limited amplifier such as a Josephson parametric amplifier, the…Junjie Li·Sep 7, 2026SaveLearn
Hudson's theorem fails for the SU(1,1) discrete seriesHudson's theorem states that a pure state of a bosonic mode has a non-negative Wigner function if and only if it is Gaussian. It underwrites the reading of Wigner negativity as a faithful…Chon-Fai Kam·Sep 7, 2026SaveLearn
Asymmetric quantum error correction efficiently tackles application-specific noise effectsNoise is a major challenge for current quantum computers. It can be broadly categorized into bit-flip and phase-flip errors. These two types do not necessarily affect the executed algorithm, thus…Abhishek Yadav, Peter K. Schuhmacher, Michael Epping·Sep 7, 2026SaveLearn
Power and Limits of Collective Local Measurements in Multicopy State DiscriminationMore than two decades ago, Bennett et al. [Phys. Rev. A 59, 1070 (1999)] asked whether perfect local discrimination of orthogonal quantum states can require more than two copies. This…Mao-Sheng Li, Yan-Ling Wang, Zhu-Jun Zheng·Sep 7, 2026SaveLearn
From NISQ to Fault-Tolerance: Applications and Algorithmic Benchmarks for Spin QubitsMotivated by recent breakthroughs in the development of spin-based quantum processing units based on exchange-only (EO) spin qubits, we provide a roadmap for the implementation of quantum algorithms…Frederik Lohof, Florian Ginzel, Wolfgang Lechner·Sep 7, 2026SaveLearn
Remote Flux Refocuses Nonadiabatic Excursions in Compact-State Quantum TransferCompact states embedded in a propagating band can carry quantum information, but finite-time transfer can populate modes outside their subspace. We show that a remote flux can refocus this amplitude…X. S. Meng, Y. S. Liu, X. Z. Zhang·Sep 7, 2026SaveLearn
Electron beam driven collective self hybridized exciton polaritonsSelf-hybridized exciton polaritons in layered semiconductors emerge from the hybridization of excitonic resonances with confined photonic modes in films and provide a versatile platform for…Parsa Darman, Maximilian Black, Prabhdeep Singh et al.·Sep 7, 2026SaveLearn
From Quantum Cryptography to Intuitionism and beyond: relativity, many-worlds and non-localityAfter a recollection of some of my encounters with Gilles Brassard, on the occasion of his 70th birthday I present, first, a new idea on creation of new information at a limited rate. Next, I develop…Nicolas Gisin·Sep 7, 2026SaveLearn