Papers
Live trends in quantum computing research, updated daily from arXiv.
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Basis dependence of Neural Quantum States for the Transverse Field Ising Model
Ronald Santiago Cortes, Aravindh S. Shankar, Marcello Dalmonte +2 more·Dec 12, 2025
Neural Quantum States (NQS) are powerful tools used to represent complex quantum many-body states in an increasingly wide range of applications. However, despite their popularity, at present only a rudimentary understanding of their limitations exist...
Highly Nondegenerate Entangled Photon Source for Fiber-Based Quantum Key Distribution
Vasile-Laurentiu Dosan, Alek Lagarrigue, Alessandro Zannotti +4 more·Dec 12, 2025
Entangled photon sources (EPSs) are essential building blocks for scalable quantum communication and quantum key distribution (QKD). We present a stable, highly nondegenerate EPS based on type-0 spontaneous parametric down-conversion (SPDC) in a cros...
Polarization Entanglement in Atomic Biphotons via OAM-to-Spin Mapping
Chang-Wei Lin, Yi-Ting Ma, Jiun-Shiuan Shiu +1 more·Dec 12, 2025
We demonstrate polarization-entangled biphotons in a cold-atom double-$Λ$ system, overcoming atomic selection rules that suppress polarization correlations and favor orbital angular momentum (OAM) entanglement. Using spatial light modulators, we cohe...
Tight bound for the total time in digital-analog quantum computation
Mikel Garcia-de-Andoin, Mikel Sanz·Dec 12, 2025
Digital-analog quantum computing (DAQC) is a universal computational paradigm that combines the evolution under an entangling Hamiltonian with the application of single-qubit gates. Since any unitary operation can be decomposed into a sequence of evo...
Boltzmann to Lindblad: Classical and Quantum Approaches to Out-of-Equilibrium Statistical Mechanics
Stefano Giordano, Giuseppe Florio, Giuseppe Puglisi +2 more·Dec 12, 2025
Open quantum systems play a central role in contemporary nanoscale technologies, including molecular electronics, quantum heat engines, quantum computation and information processing. A major theoretical challenge is to construct dynamical models tha...
Tailoring quantum walks in integrated photonic lattices
A. Raymond, P. Cathala, M. Morassi +4 more·Dec 12, 2025
Unlike discrete photonic circuits, which manipulate photons step-by-step using a series of optical elements, arrays of coupled waveguides enable photons to interfere continuously across the entire structure. When composed of a nonlinear material, suc...
The Casimir-Polder interaction between atoms and hollow-core fibers
Bettina Beverungen, Daniel Reiche, Kurt Busch +1 more·Dec 12, 2025
The Casimir-Polder force acts on polarizable particles due to quantum fluctuations of the electromagnetic field that are modified by the presence of material bodies. We investigate the Casimir-Polder interaction for atoms near cylindrical fibers with...
A slightly improved upper bound for quantum statistical zero-knowledge
François Le Gall, Yupan Liu, Qisheng Wang·Dec 12, 2025
The complexity class Quantum Statistical Zero-Knowledge ($\mathsf{QSZK}$), introduced by Watrous (FOCS 2002) and later refined in Watrous (SICOMP, 2009), has the best known upper bound $\mathsf{QIP(2)} \cap \text{co-}\mathsf{QIP(2)}$, which was simpl...
The Lattice Schwinger Model and Its Quantum Simulation
Joao C. Pinto Barros, Pierpaolo Fontana, Pasquale Sodano +1 more·Dec 12, 2025
In this chapter we review results on the lattice Schwinger model. In par-ticular, we show how the effect of the anomaly is reproduced on the lattice. We connect these results to recent developments in the field of quantum simulation of interacting fi...
Equilibration and the Eigenstate Thermalization Hypothesis as Limits to Observing Macroscopic Quantum Superpositions
Gabriel Dias Carvalho, Pedro S. Correia, Thiago R. de Oliveira·Dec 12, 2025
Macroscopic quantum superpositions are widely believed to be unobservable because large systems cannot be perfectly isolated from their environments. Here, we show that even under perfect isolation, intrinsic unitary dynamics with the eigenstate ther...
Irreducibility of Quantum Markov Semigroups, uniqueness of invariant states and related properties
Franco Fagnola, Federico Girotti·Dec 12, 2025
We present different characterizations of the notion of irreducibility for Quantum Markov Semigroups (QMSs) and investigate its relationship with other relevant features of the dynamics, such as primitivity, positivity improvement and relaxation; in ...
FRQI Pairs method for image classification using Quantum Recurrent Neural Network
Rafał Potempa, Michał Kordasz, Sundas Naqeeb Khan +4 more·Dec 12, 2025
This study aims to introduce the FRQI Pairs method to a wider audience, a novel approach to image classification using Quantum Recurrent Neural Networks (QRNN) with Flexible Representation for Quantum Images (FRQI). The study highlights an innovative...
High magnetic field response of superconductivity dome in quantum artificial High Tc superlattices with variable geometry
Gaetano Campi, Andrea Alimenti, Sang-Eon Lee +5 more·Dec 12, 2025
It is known that cuprate artificial high Tc superlattices (AHTS) with period d, composed of quantum wells confining interface space charge in stoichiometric Mott insulator layers (S), with thickness L, at the interface with overdoped normal metallic ...
NetQMPI: An MPI-Inspired library for programming Distributed Quantum Applications over Quantum Networks using NetQASM SDK
F. Javier Cardama, Tomás F. Pena·Dec 12, 2025
Distributed Quantum Computing (DQC) is essential for scaling quantum algorithms beyond the limitations of monolithic NISQ devices. However, the current software ecosystem forces developers to manually orchestrate low-level network resources, such as ...
Bell, Spinors, and the Impossibility of a Classical Spin-Vector Model
G. A. Koroteev·Dec 12, 2025
We revisit the Bell--CHSH scenario for two spin-\(\tfrac{1}{2}\) particles and isolate the precise algebraic origin of the Bell contradiction. On the quantum side, spin-\(\tfrac{1}{2}\) is described by a noncommutative spinor (Clifford) algebra actin...
Spin-correlation dynamics: A semiclassical framework for nonlinear quantum magnetism
Lukas Körber, Pim Coenders, Johan H. Mentink·Dec 12, 2025
Classical nonlinear theories are highly successful in describing far-from-equilibrium dynamics of magnets, encompassing phenomena such as parametric resonance, ultrafast switching, and even chaos. However, at ultrashort length and time scales, where ...
Stochastic limits of Quantum repeated measurements
Antoine Jacquier, Kostas Kardaras, Adeline Viot·Dec 12, 2025
We investigate quantum systems perturbed by noise in the form of repeated interactions between the system and the environment. As the number of interactions (aka time steps) tends to infinity, we show, following the works by Pellegrini, that this sys...
Processing through encoding: Quantum circuit approaches for point-wise multiplication and convolution
Andreas Papageorgiou, Paulo Vitor Itaborai, Kostas Blekos +1 more·Dec 12, 2025
This paper introduces quantum circuit methodologies for pointwise multiplication and convolution of complex functions, conceptualized as "processing through encoding". Leveraging known techniques, we describe an approach where multiple complex functi...
Comment on "Contextuality and quantum discord"
Chellasamy Jebarathinam·Dec 12, 2025
In a paper, Al-Qasimi [Physics Letters A 449 (2022) 128347] proposed a criterion for contextuality of two-qubit systems extending Peres' proof of contextuality [Phys. Lett. A 151 (1990) 107]. Using this criterion, Al-Qasimi argued that certain discor...
Nonreciprocal flow of fluctuations, populations and correlations between doubly coupled bosonic modes
Zbigniew Ficek·Dec 12, 2025
Interesting new correlation and unidirectional properties of two bosonic modes under the influence of environment appear when the modes are mutually coupled through the simultaneously applied linear mode-hopping and nonlinear squeezing interactions. ...