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Live trends in quantum computing research, updated daily from arXiv.
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Measure and Forget Dynamics in Random Circuits
Yucheng He, Todd A. Brun·Nov 26, 2025
"Forgetful" measurements-physically similar to dephasing-are of interest both for applications to fault-tolerant quantum computing and fundamentally, in studying how entanglement and entropy spread. This paper investigates measurement-induced phase t...
No need to calibrate: characterization and compilation for high-fidelity circuit execution using imperfect gates
Ashish Kakkar, Samuel Marsh, Yulun Wang +5 more·Nov 26, 2025
We propose and validate on real quantum computing hardware a new method for extended two-qubit gate set design, replacing iterative, fine calibration with fast characterization of a small number of gate parameters which are then tracked and corrected...
Exceptional points and spectral cusps from density-wave fluctuation
Zixi Fang, Chen Fang·Nov 26, 2025
We report two types of singularities that arise from fluctuations during the formation of charge- or spin-density waves. The first is the exceptional point (EP), corresponding to a higher-order pole of the retarded Green's function. Such EPs lead to ...
Testing Single Photon Entanglement using Self-Referential Measurements
Daniel Kun, Teodor Strömberg, Borivoje Dakić +2 more·Nov 26, 2025
Entanglement does not always require one particle per party. It was predicted some thirty years ago that a single photon traversing a beam splitter could violate a Bell inequality. Although initially debated, single-photon nonlocality was eventually ...
Obstruction to Ergodicity from Locality and $U(1)$ Higher Symmetries on the Lattice
Ramanjit Sohal, Ruben Verresen·Nov 26, 2025
We argue that the presence of \emph{any} exact $U(1)$ higher-form symmetry, under mild assumptions, presents a fundamental obstruction to ergodicity under unitary dynamics in lattice systems with local interactions and finite on-site Hilbert space di...
Holographically Emergent Gauge Theory in Symmetric Quantum Circuits
Akash Vijay, Jong Yeon Lee·Nov 26, 2025
We develop a novel holographic framework for mixed-state phases in random quantum circuits, both unitary and non-unitary, with a global symmetry $G$. Viewing the circuit as a tensor network, we decompose it into two parts: a symmetric layer, which de...
Finite Size Analysis of Decoy-State BB84 with Advantage Distillation
Jonas Treplin, Philipp Kleinpaß, Davide Orsucci·Nov 26, 2025
Advantage Distillation (AD) is a classical post-processing technique that enhances Quantum Key Distribution (QKD) protocols by increasing the maximum acceptable Quantum Bit Error Rate (QBER) and thus extending the distance at which QKD links can be s...
FPGA-tailored algorithms for real-time decoding of quantum LDPC codes
Satvik Maurya, Thilo Maurer, Markus Bühler +2 more·Nov 26, 2025
Real-time decoding is crucial for fault-tolerant quantum computing but likely requires specialized hardware such as field-programmable gate arrays (FPGAs), whose parallelism can alter relative algorithmic performance. We analyze FPGA-tailored version...
Rapid ground state energy estimation with a Sparse Pauli Dynamics-enabled Variational Double Bracket Flow
Chinmay Shrikhande, Arnab Bachhar, Aaron Rodriguez Jimenez +1 more·Nov 26, 2025
Ground state energy estimation for strongly correlated quantum systems remains a central challenge in computational physics and chemistry. While tensor network methods like DMRG provide efficient solutions for one-dimensional systems, higher-dimensio...
Higher-order nonclassicality criteria for photon-subtracted and photon-added states via the normalization constant
Jhordan Santiago·Nov 26, 2025
We show that any nonclassicality criterion based on factorial moments, including several higher-order parameters such as the Mandel $Q^{(\ell)}$ parameter, the Lee antibunching function $d^{(\ell-1)}_h$, and the Agarwal--Tara parameter $A_3$, can be ...
Factorisation conditions and causality for local measurements in QFT
Robin Simmons, Maria Papageorgiou, Marios Christodoulou +1 more·Nov 26, 2025
Quantum operations that are perfectly admissible in non-relativistic quantum theory can enable signalling between spacelike separated regions when naively imported into quantum field theory (QFT). Prominent examples of such "impossible measurements",...
Tunable WS$_2$ Micro-Dome Open Cavity Single Photon Source
Jens-Christian Drawer, Salvatore Cianci, Vita Solovyeva +13 more·Nov 26, 2025
Versatile, tunable, and potentially scalable single-photon sources are a key asset in emergent photonic quantum technologies. In this work, a single-photon source based on WS$_2$ micro-domes, created via hydrogen ion irradiation, is realized and inte...
Lazy Quantum Walks with Native Multiqubit Gates
Steph Foulds, Viv Kendon·Nov 26, 2025
Quantum walks, the quantum analogue of the classical random walk, have been shown to underpin quantum algorithms for fluid dynamics. We propose the quantum half-adder gate method for quantum walks as a good benchmark algorithm, specifically to compar...
The derivation of the Liouville equation from the Schrodinger equation and its implications
A. P. Meilakhs·Nov 26, 2025
We present a new way of deriving classical mechanics from quantum mechanics. A key feature of the method is its compatibility with the standard approach used to derive transition rates between quantum states due to interactions. We apply the develope...
Dichroism from Chiral Thermoelectric Probes: Generalized Sum Rules for Orbital and Heat Magnetizations
Baptiste Bermond, Lucila Peralta Gavensky, Anaïs Defossez +1 more·Nov 26, 2025
We introduce a unified framework that relates orbital and heat magnetizations to experimentally accessible excitation spectra, through thermoelectric probes and generalized sum rules. By analyzing zero-temperature transport coefficients and applying ...
Unconventional orders in the maple-leaf ferro-antiferromagnetic Heisenberg model
Lasse Gresista, Dominik Kiese, Simon Trebst +1 more·Nov 26, 2025
Motivated by the search for unconventional orders in frustrated quantum magnets, we present a multi-method investigation into the nature of the quantum phase diagram of the spin-$1/2$ Heisenberg model on the maple-leaf lattice with three symmetry-ine...
Quantum Latent Gauge and Coherence Selective Forces
Ridha Horchani·Nov 26, 2025
We propose a hidden U(1) gauge interaction that couples exclusively to quantum coherence in massive systems. The central innovation is a conserved coherence current operator constructed from the Noether mass current via operator-level coarse-graining...
Metastability in the Dissipative Quantum Rabi Model
Da-Wu Xiao, Chong Chen·Nov 26, 2025
The dissipative quantum Rabi model exhibits rich non-equilibrium physics, including a dissipative phase transition from the normal phase to the superradiant phase. In this work, we investigate the stability of the superradiant phase in the presence o...
Modeling dissipation in quantum active matter
Alexander P. Antonov, Sangyun Lee, Benno Liebchen +5 more·Nov 26, 2025
Active matter denotes a system of particles immersed in an external environment, from which the particles extract energy continuously in order to perform directed motion. Extending the paradigm of active matter to a quantum framework requires an appr...
Quantum theory of electrically levitated nanoparticle-ion systems: Motional dynamics and sympathetic cooling
Saurabh Gupta, Dmitry S. Bykov, Tracy E. Northup +1 more·Nov 26, 2025
We develop the theory describing the quantum coupled dynamics of the center-of-mass motion of a nanoparticle and an ensemble of ions co-trapped in a dual-frequency linear Paul trap. We first derive analytical expressions for the motional frequencies ...