Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Machine-Learning-Empowered Quantum Sensing of the Plaquette Phase in a Three-Level Delta System
Lorenzo Vitale, Shreyasi Mukherjee, Dario Fasone +4 more·Jul 16, 2026
We propose a machine-learning-empowered approach to the quantum sensing of the plaquette phase, a gauge-invariant quantity arising in three-level $Δ$ systems. This phase profoundly affects the system dynamics, breaking coherent population trapping an...
Implicit differentiation of tensor network algorithms
Lander Burgelman, Anna Francuz, Paul Brehmer +4 more·Jul 16, 2026
The current leading approach to the variational optimization of projected entangled-pair states (PEPS) is based on automatic differentiation, which allows for a convenient evaluation of the energy gradient with respect to the local variational degree...
Quantum error-correcting codes from aperiodic monotiles: the Hat and the Spectre
Josep Batle, Adam Bednorz·Jul 16, 2026
Li and Boyle showed that the Penrose tiling defines a quantum error-correcting code: superpositions of tilings over isometry orbits protect quantum information against erasure of any bounded region. We extend the construction to the aperiodic monotil...
Quantum XYZ Stabilizer Codes
Alessio Baldelli, Davide Orsucci, Francisco Lázaro +1 more·Jul 16, 2026
Stabilizer codes are often constructed within the Calderbank--Shor--Steane (CSS) framework, where two mutually orthogonal binary classical codes define $X$ and $Z$-type stabilizer generators. While this structure is algebraically convenient, addition...
Pareto-optimal work extraction and the thermodynamic cost of precision in quantum information engines
Jonas Berx, Ted Olander, Henning Kirchberg·Jul 16, 2026
We study a finite-time quantum information engine in which a two-level system is measured by a quantum harmonic oscillator acting as a meter and where useful work is extracted conditionally on the measurement outcome. Using multi-objective optimisati...
Strong $O$-valued contextuality: ruling out discrete nondeterministic alternatives to quantum theory
Ravishankar Ramanathan·Jul 16, 2026
Gleason's theorem identifies the Born rule via non-contextuality over an infinite continuous lattice of projectors, while its corollary the Kochen-Specker (KS) theorem rules out the specific class of deterministic ($\{0,1\}$-valued) noncontextual mod...
A Three-Point Continuous-Variable Quantum MacWilliams Identity
Yinzi Xiao·Jul 16, 2026
We construct the three-point continuous-variable (CV) quantum MacWilliams identity, extending the two-point framework of Burchards, and give its closed-form integral kernel. Its configuration space carries a symplectic invariant with no classical cou...
Star-triangle duality estimates for triangular and honeycomb permutation models
Masayuki Ohzeki·Jul 16, 2026
We study a duality analysis in conjunction with the star-triangle transformation for symmetric-group permutation models on the triangular and honeycomb lattices. The calculation is motivated by the permutation-model description of random tensor netwo...
Evolution-Level Quantum Optimal Control of Single-Qubit Gates with Physics-Informed Neural Networks
Yao Du, Jian-Jian Cheng, Lin Zhang +2 more·Jul 16, 2026
Quantum gate design is often represented as pulse optimization, although the physical object that implements a gate is the full controlled evolution generated by the pulse. Here we use physics-informed neural networks to represent single-qubit gate d...
A Geometric Theory of Fermion-to-Qubit Encodings
Lakshya Nagpal, Nishith Reen, S. R. Hassan·Jul 16, 2026
Exact fermion to qubit transformations are conventionally regarded as algorithmic tools that translate many-body Hamiltonians into qubit representations for quantum simulation. Here we show that they also define intrinsic geometric representations wh...
Fermion-doubling problem in Chiral discretizations of Quantum field theory: Definitive proof, Fixing, and Computation of two-point correlation function
Dogukan Bakircioglu, Pablo Arnault·Jul 16, 2026
We give the definitive proof that the Dirac Quantum Cellular Automaton (QCA) used for both quantum simulation and algorithmic foundations of Quantum Field Theory (QFT), and especially of Quantum Electrodynamics (QED), as put forward in References htt...
Limits on Broadcasting Genuine Multipartite Entanglement in Quantum Networks
Pritam Roy, William John Munro, Shashank Gupta·Jul 16, 2026
We establish operational limits on the broadcasting of genuine multipartite entanglement (GME) in quantum networks. Using a distributed protocol in which each of N parties locally implements optimal 1 $\to$ 2 cloning via beam-splitter interactions, w...
Binary Gauss Stabilizers for Abelian Lattice Gauge Theories
Matteo Turco, Luca Spagnoli, Alessandro Roggero·Jul 16, 2026
Gauge theories and quantum error-correcting codes share the same underlying structure: both use constraints to identify a specific subspace of the full Hilbert space. In quantum error correction, these constraints are known as stabilizers, while in g...
Quantum Remote Implementation of Hybrid Operations on Hyperstates Using Hyperentangled States
Satish Kumar, Anirban Pathak·Jul 16, 2026
Quantum remote control, also known as quantum remote implementation of an operator (QRIO), enables the remote manipulation of an arbitrary quantum state by implementing a desired quantum operation at a distant location. Significant progress has recen...
Robustness of periodicity in Grover walks under a magnetic vector potential
Hiroto Sekido, Etsuo Segawa·Jul 16, 2026
We study the effect of magnetic vector potentials on periodic Grover walks on finite graphs. The magnetic vector potential is introduced through the framework of quantum graphs, which induces the Grover walk as a special case. We regard the vector po...
Local Variance-Based Calibration of Programmable Photonic Interferometer Meshes
Gökhan Elmas, Igor A. Litvin, Janis Nötzel·Jul 16, 2026
Programmable photonic interferometer meshes enable reconfigurable linear optical transformations, but their performance depends critically on accurate calibration of Mach-Zehnder interferometers and phase shifters. Conventional methods often require ...
Moment Optimization in the Navascués-Pironio-Acín Hierarchy
Francesco Flora, Losel Matos, Tim Heightman +3 more·Jul 16, 2026
The Navascués-Pironio-Acín (NPA) hierarchy provides a convergent sequence of semidefinite programming (SDP) relaxations for noncommutative polynomial optimisation, ubiquitous in quantum physics. However, its practical applicability is limited by the ...
High-rate continuous-variable quantum key distribution coexisting with Tb/s coherent classical transmission in hollow-core fiber
Xitao Ji, Siyu Chen, Peng Li +7 more·Jul 16, 2026
Quantum key distribution (QKD) can provide secret keys with security rooted in quantum mechanics, but operation alongside high-capacity classical traffic remains limited by the excess-noise budget of weak quantum states in conventional solid-core fib...
Electrons Hopping across a Molecular Network: Spectra and Symmetries
Ludwig Schulz, Max Best, Carsten Henkel·Jul 16, 2026
We investigate interacting spinless electrons on finite molecular ring networks described by a tight-binding Hubbard Hamiltonian. The interplay between lattice geometry, Coulomb interactions and discrete symmetries is analysed for rings with $L=3,4,5...
Tuning the universality class of a quantum process by Trotterization
Robin Prampain dit Boulan, Jerom Jebai, Hendrik Weimer·Jul 16, 2026
We numerically analyze a discretized version of the quantum contact process, a non-equilibrium model having a competition between a coherent infection process and a dissipative recovery process. Previously, the continuous-time version has been discus...