Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Foundations of Quantum Granular Computing with Effect-Based Granules, Algebraic Properties and Reference Architectures
Oscar Montiel Ross·Nov 27, 2025
This paper develops the foundations of Quantum Granular Computing (QGC), extending classical granular computing including fuzzy, rough, and shadowed granules to the quantum regime. Quantum granules are modeled as effects on a finite dimensional Hilbe...
Accurate computation of the energy variance and $\langle\langle \mathcal{L}^\dagger \mathcal{L} \rangle\rangle$ using iPEPS
Emilio Cortés Estay, Naushad A. Kamar, Philippe Corboz·Nov 27, 2025
Infinite projected entangled-pair states (iPEPS) provide a powerful tensor network ansatz for two-dimensional quantum many-body systems in the thermodynamic limit. In this paper we introduce an approach to accurately compute the energy variance of an...
Out-of-Time-Order Correlator Spectroscopy
Keisuke Fujii·Nov 27, 2025
Out-of-time-order correlators (OTOCs) are central probes of quantum scrambling, and their generalizations have recently become key primitives for both benchmarking quantum advantage and learning the structure of Hamiltonians. Yet their behavior has l...
A reconciliation of the Pryce-Ward and Klein-Nishina statistics for semi-classical simulations of annihilation photons correlations
Petar Žugec, Eric Andreas Vivoda, Mihael Makek +1 more·Nov 27, 2025
Two photons from the ground state para-positronium annihilation are emitted in a maximally entangled singlet state of orthogonal polarizations. In case of the Compton scattering of both photons the phenomenon of quantum entanglement leads to a measur...
Recursive Clifford noise reduction
Aharon Brodutch, Gregory Baimetov, Edwin Tham +1 more·Nov 27, 2025
Clifford noise reduction (CliNR) is a partial error correction scheme that reduces the logical error rate of Clifford circuits at the cost of a modest qubit and gate overhead. The CliNR implementation of an $n$-qubit Clifford circuit of size $s$ achi...
High-yield engineering and identification of oxygen-related modified divacancies in 4H-SiC
Qi-Cheng Hu, Ji-Yang Zhou, Shuo Ren +9 more·Nov 27, 2025
Modified divacancies in the 4H polytype of silicon carbide (SiC) exhibit enhanced charge stability and spin addressability at room temperature, making them attractive for quantum applications. However, their low formation yield and lack of direct str...
An Optimal Framework for Constructing Lie-Algebra Generator Pools: Application to Variational Quantum Eigensolvers for Chemistry
Yaromir Viswanathan, Olivier Adjoua, César Feniou +2 more·Nov 27, 2025
Lie Algebras are powerful mathematical structures used in physics to describe sets of operators and associated combinations. A central task is to identify a minimal set of generators from which the algebra can be constructed. The classical search for...
Deconstructing symmetry breaking dynamics
Fumika Suzuki, Wojciech H. Zurek·Nov 27, 2025
The Kibble-Zurek mechanism (KZM) successfully predicts the density of topological defects deposited by the phase transitions, but it is not clear why. Its key conjecture is that, near the critical point of the second-order phase transition, critical ...
Superconducting Qubit Gates Robust to Parameter Fluctuations
Emily Wright, Leo Van Damme, Niklas J. Glaser +14 more·Nov 27, 2025
State-of-the-art single-qubit gates on superconducting transmon qubits can achieve the fidelities required for error-corrected computations. However, parameter fluctuations due to qubit instabilities, environmental changes, and control inaccuracies m...
Tunable and nonlinearity-enhanced dispersive-plus-dissipative coupling in photon-pressure circuits
Mohamad Kazouini, Janis Peter, Zisu Emily Guo +5 more·Nov 27, 2025
Photon-pressure circuits are the circuit implementation of the cavity optomechanical Hamiltonian and discussed for qubit readout, low-frequency quantum photonics and dark matter axion detection. Due to the enormous design flexibility of superconducti...
Graphical Tests of Causality
Ämin Baumeler, Eleftherios-Ermis Tselentis, Stefan Wolf·Nov 27, 2025
Bell inequalities limit the possible observations of non-communicating parties. Here, we present analogous inequalities for any number of communicating parties under the causal constraints of static causal order, definite causal order, and bi-causal ...
A programming language combining quantum and classical control
Kinnari Dave, Louis Lemonnier, Romain Péchoux +1 more·Nov 27, 2025
The two main notions of control in quantum programming languages are often referred to as "quantum" control and "classical" control. With the latter, the control flow is based on classical information, potentially resulting from a quantum measurement...
Quantum Circuit Equivalence Checking: A Tractable Bridge From Unitary to Hybrid Circuits
Jérome Ricciardi, Sébastien Bardin, Christophe Chareton +1 more·Nov 27, 2025
Equivalence checking of hybrid quantum circuits is of primary importance, given that quantum circuit transformations are omnipresent along the quantum compiler chain. While some approaches exist for automating this task, most focus on the simple case...
Mixed cat states at low purity of light
N. I. Petrov·Nov 27, 2025
Pure states are usually used to observe quantum phenomena. In this study, we show that a quantum superposition of spatially displaced mixed cat states can be generated within an optical waveguide via nonparaxial unitary evolution of the initial low c...
High-Precision Fidelity Estimation with Common Randomized Measurements
Zhongyi Yang, Datong Chen, Zihao Li +1 more·Nov 27, 2025
Efficient fidelity estimation of multiqubit quantum states is crucial to many applications in quantum information processing. However, to estimate the infidelity $ε$ with multiplicative precision, conventional estimation protocols require (order) $1/...
Replica Field Theory of Quantum Jumps Monitoring: Application to the Ising Chain
Youenn Le Gal, Marco Schirò·Nov 27, 2025
In this work we derive the replica field theory for monitored quantum many-body systems evolving under the quantum jumps protocol, corresponding to a non-Hermitian evolution interspersed with random quantum jumps whose distribution is state-dependent...
Optimal Quantum Measurements with respect to the Fidelity
Datong Chen, Huangjun Zhu·Nov 27, 2025
Fidelity is the standard measure for quantifying the similarity between two quantum states. It is equal to the square of the minimum Bhattacharyya coefficient between the probability distributions induced by quantum measurements on the two states. Th...
Wavelength-Dependent Electrical Readout of Spin Ensembles in a Thin-Film SiC-on-Insulator Platform
Alexander Zappacosta, Ben Haylock, Paul Fisher +2 more·Nov 27, 2025
We report electrical spin state readout and coherent control of an ensemble ($\sim$540) of silicon vacancies ($\mathrm{V}_{\mathrm{Si}}^{-}$) in a silicon carbide-on-insulator (SiCOI) platform, with excitation wavelengths from 780 to 990 nm, demonstr...
Radio-Frequency Hong-Ou-Mandel Interference with Conditionally Built States
A. Sheleg, D. Vovchuk, K. Boiko +8 more·Nov 27, 2025
We report an experimental demonstration of room-temperature Hong-Ou-Mandel (HOM) interference at a radio-wave frequency of 120 MHz using conditional build-up of quantum states from classical phase-averaged coherent states. This approach enables obser...
Improved parameter initialization for the (local) unitary cluster Jastrow ansatz
Wan-Hsuan Lin, Fangchun Liang, Mario Motta +3 more·Nov 27, 2025
The unitary cluster Jastrow (UCJ) ansatz and its variant known as local UCJ (LUCJ) are promising choices for variational quantum algorithms for chemistry due to their combination of physical motivation and hardware efficiency. The parameters of these...