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Live trends in quantum computing research, updated daily from arXiv.
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Reshaping nonclassical properties and metrological performance of entangled coherent states via post-selected von Neumann measurements
Janarbek Yuanbek, Bruno Tenorio, Yusuf Turek·Nov 18, 2025
In quantum metrology, measurements are usually treated as passive readout processes. Here we investigate whether post-selected von Neumann measurements (PVNMs) can be used as an active resource to reshape the nonclassical properties of a two-mode ent...
Postselected Entangled States by Photon Detection
Pedro Rosario, A. Cidrim, R. Bachelard·Nov 18, 2025
Postselection is a non-deterministic mechanism to entangle subsystems, often used in weakly-excited systems. We here show how highly-excited ensembles of two-level emitters can be entangled by photon detection. A collective spin is formed, characteri...
QML-HCS: A Hypercausal Quantum Machine Learning Framework for Non-Stationary Environments
Hector E Mozo·Nov 18, 2025
QML-HCS is a research-grade framework for constructing and analyzing quantum-inspired machine learning models operating under hypercausal feedback dynamics. Hypercausal refers to AI systems that leverage extended, deep, or nonlinear causal relationsh...
Tunable quantum photonic routing using a coupled giant-atom-like array
Alexis R. Legón, Mario Miranda, P. A. Orellana·Nov 17, 2025
We examine a quantum routing mechanism utilizing a giant-atom-like array coupled to two one-dimensional waveguides. The giant-atom-like array is formed by a one-dimensional array of three-level-systems. In the regime of strong atom-waveguide coupling...
Screw-dislocation-engineered quantum dot: geometry-tunable nonlinear optics, orbital qubit addressability, and torsion metrology
Edilberto O. Silva·Nov 17, 2025
We study a single electron confined in a uniform-torsion medium, a continuum model of a screw dislocation density, in a perpendicular magnetic field, and in the presence of an Aharonov--Bohm flux. Torsion alone produces radial confinement without any...
Hybrid continuous-discrete-variable quantum computing: a guide to utility
A. F. Kemper, Antonios Alvertis, Muhammad Asaduzzaman +24 more·Nov 17, 2025
Quantum computing has traditionally centered around the discrete variable paradigm. A new direction is the inclusion of continuous variable modes and the consideration of a hybrid continuous-discrete approach to quantum computing. In this paper, we d...
Many-Body Time Evolution from a Correlation-Efficient Quantum Algorithm
Michael Rose, David A. Mazziotti·Nov 17, 2025
We introduce the correlation-efficient time-evolution (CETE) algorithm for simulating quantum many-body dynamics. CETE recasts each step of time evolution as a time-independent correlation problem: the ansatz begins from a mean-field single Slater de...
Linguistic Predictability and Search Complexity: How Linguistic Redundancy Constraints the Landscape of Classical and Quantum Search
Alessio Di Santo, Gabriella Lanziani·Nov 17, 2025
This study examines the quantitative relationship between linguistic regularities and computational search complexity through a hybrid classical-quantum framework applied to Renaissance Italian texts. Using four representative works from the fifteent...
Halving the Cost of Controlled Time-Evolution
William A. Simon, Peter J. Love·Nov 17, 2025
Quantum simulation is a promising application for quantum computing. Quantum simulation algorithms may require the ability to control the time evolution unitary. Naive techniques to control a unitary can substantially increase the required computatio...
Fermionic Born Machines: Classical training of quantum generative models based on Fermion Sampling
Bence Bakó, Zoltán Kolarovszki, Zoltán Zimborás·Nov 17, 2025
Quantum generative learning is a promising application of quantum computers, but faces several trainability challenges, including the difficulty in experimental gradient estimations. For certain structured quantum generative models, however, expectat...
Trading athermality for nonstabiliserness
A. de Oliveira Junior, Rafael A. Macedo, Jakub Czartowski +2 more·Nov 17, 2025
Nonstabiliserness is a fundamental resource for quantum advantage, capturing how much a quantum state breaks the symmetries that would make it classically simulable. Can nonstabiliserness be generated from stabiliser states simply by coupling them to...
Non-invertible defects in generalized Ising models via strange correlator
Aswin Parayil Mana, Yaman Sanghavi·Nov 17, 2025
Defects associated with non-invertible symmetries have attracted significant attention in recent years. Among them, Kramers-Wannier (KW) duality defects have been investigated in both classical statistical systems and quantum Hamiltonian models. Aase...
Quantum Metamorphosis: Programmable Emergence and the Breakdown of Bulk-Edge Dichotomy in Multiscale Systems
Mahmoud Jalali Mehrabad, Alireza Parhizkar, Lida Xu +6 more·Nov 17, 2025
Multiscale synergy -- the interplay of a system's distinct characteristic length, time, and energy scales -- is becoming a unifying thread across many contemporary branches of science. Ranging from moiré and super-moiré materials and cold atoms to DN...
Realizing Unitary $k$-designs with a Single Quench
Yi-Neng Zhou, Robin Löwenberg, Julian Sonner·Nov 17, 2025
We present a single-quench protocol that generates unitary $k$-designs with minimal control. A system first evolves under a random Hamiltonian $H_1$; at a switch time $t_s \geq t_{\mathrm{Th}}$ (the Thouless time), it is quenched to an independently ...
Optimizing two-dimensional isometric tensor networks with quantum computers
Sebastian Leontica, Alberto Baiardi, Julian Schuhmacher +2 more·Nov 17, 2025
We propose a hybrid quantum-classical algorithm for approximating the ground state of two-dimensional quantum systems using an isometric tensor network ansatz, which maps naturally to quantum circuits. Inspired by the density matrix renormalization g...
Skeleton of isometric Tensor Network States for Abelian String-Net Models
Julian Boesl, Yu-Jie Liu, Frank Pollmann +1 more·Nov 17, 2025
We construct parametrized isometric tensor network states -- referred to as skeletons -- that allow us to explore phases of abelian topological order and can be efficiently implemented on quantum processors. We obtain stable finite correlation length...
Detection of many-body entanglement partitions in a quantum computer
Albert Rico, Dmitry Grinko, Robin Krebs +1 more·Nov 17, 2025
We present a method to detect entanglement partitions of multipartite quantum systems, by exploiting their inherent symmetries. Structures like genuinely multipartite entanglement, $m$-separability and entanglement depth are detected as very special ...
Quantum Error Correction Codes for Truncated SU(2) Lattice Gauge Theories
Xiaojun Yao·Nov 17, 2025
We construct two quantum error correction codes for pure SU(2) lattice gauge theory in the electric basis truncated at the electric flux $j_{\rm max}=1/2$, which are applicable on quasi-1D plaquette chains, 2D honeycomb and 3D triamond and hyperhoney...
Ultra Low Overhead Syndrome Extraction for the Steane code
Boldizsár Poór, Benjamin Rodatz, Aleks Kissinger·Nov 17, 2025
We establish a new performance benchmark for the fault-tolerant syndrome extraction of [[7, 1, 3]] Steane code with a dynamic protocol. Our method is built on two highly optimized circuits derived using fault-equivalent ZX-rewrites: a primary fault-t...
Network Operations Scheduling for Distributed Quantum Computing
Nitish Kumar Chandra, Eneet Kaur, Kaushik P. Seshadreesan·Nov 17, 2025
Realizing distributed architectures for quantum computing is crucial to scaling up computational power. A key component of such architectures is a scheduler that coordinates operations over a short-range quantum network required to enable the necessa...