Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Study of spin states in vacuum pair production via the Dirac-Heisenberg-Wigner formalism
R. Z. Jiang, Z. L. Li, Y. J. Li·Oct 1, 2025
A general spin-resolved momentum distribution of electron-positron pairs produced in strong external fields is derived by combining the covariant spin projection operator and the Dirac-Heisenberg-Wigner (DHW) formalism. The result shows that the spin...
Neutrino backgrounds in matter-wave interferometry: implications for dark matter searches and beyond-Standard Model physics
João Paulo Pinheiro·Sep 30, 2025
We present a comprehensive theoretical analysis of neutrino-induced decoherence in macroscopic matter-wave interferometry experiments designed to search for dark matter and beyond-Standard Model physics. Our calculation includes contributions from th...
Electrical Readout of Spin Environments in Diamond for Quantum Sensing
Olga Rubinas, Michael Petrov, Emilie Bourgeois +4 more·Sep 30, 2025
Nitrogen-vacancy (NV) centres in diamond are a key platform for quantum sensing and quantum information, combining long coherence times with controllable spin-spin interactions. Most of current quantum algorithms rely on optical access, which limit d...
Progress in the study of the (non)existence of genuinely unextendible product bases
Maciej Demianowicz·Sep 30, 2025
We investigate the open problem of the existence of genuinely unextendible product bases (GUPBs), that is, multipartite unextendible product bases (UPBs) which remain unextendible even with respect to biproduct vectors across all bipartitions of the ...
Nonreciprocal superradiant quantum phase transition induced by the magnon Kerr effect
Guo-Qiang Zhang, Si-Yan Lin, Wei Feng +3 more·Sep 30, 2025
Recently, proposals for realizing a nonreciprocal superradiant quantum phase transition (SQPT) have been put forward, based on either nonreciprocal interactions between two spin ensembles or the Sagnac-Fizeau shift in a spinning cavity. However, expe...
Dual effects of Lamb Shift in Quantum Thermodynamical Systems
Zi-chen Zhang, Chang-shui Yu·Sep 30, 2025
The Lamb shift as an additional energy correction induced by environments usually has a marginal contribution and hence is neglected. We demonstrate that the Lamb shift, which modifies the energy levels, can influence the heat current to varying exte...
Barnett Effect-Induced Nonreciprocal Entanglement and Gaussian interferometric power in Magnomechanics with Optical Parametric Amplifier
Noura Chabar, M. Amghar, Shakir Ullah +5 more·Sep 29, 2025
Nonreciprocity is a powerful tool in quantum technologies. It allows signals to be sent in one direction but not the other. In this article, we propose a method for achieving non-reciprocal entanglement and Gaussian interferometric power (GIP) via th...
A Quantum Computer Based on Donor-Cluster Arrays in Silicon
Shihang Zhang, Chunhui Zhang, Guanyong Wang +4 more·Sep 29, 2025
Significant advances in silicon spin qubits highlight the potential of silicon quantum dots for scalable quantum computing, given their compatibility with industrial fabrication and long coherence times. In particular, phosphorus (P)-doped spin qubit...
Nonrelativistic quantum dynamics in a twisted screw spacetime
Faizuddin Ahmed, Edilberto O. Silva·Sep 29, 2025
We investigate the nonrelativistic quantum dynamics of a spinless particle in a screw-type spacetime endowed with two independent twist controls that interpolate between a pure screw dislocation and a homogeneous twist. From the induced spatial metri...
Non-destructive optical read-out and manipulation of circular Rydberg atoms
Yohann Machu, Andrés Durán-Hernández, Gautier Creutzer +4 more·Sep 29, 2025
Among the thriving quantum computation and quantum simulation platforms based on arrays of Rydberg atoms, those using circular Rydberg atoms are particularly promising. These atoms uniquely combine the strong dipole-dipole interactions typical of Ryd...
Information Loss and Cost in Symmetry Breaking
Javier Molina-Vilaplana, Germán Sierra, H. C. Zhang·Sep 29, 2025
We develop an algebraic and information-theoretic framework to characterize symmetry breaking of generalized, non-invertible symmetries in two spatial dimensions. The reduction of symmetry is modeled within subfactor theory, where condensable Frobeni...
Measurement-induced phase transition in interacting bosons from most likely quantum trajectory
Anna Delmonte, Zejian Li, Rosario Fazio +1 more·Sep 29, 2025
We propose a new theoretical method to describe the monitored dynamics of bosonic many-body systems based on the concept of the most likely trajectory. We show how such trajectory can be identified from the probability distribution of quantum traject...
Quantum Zeno Effect in the Spatial Evolution of a Single Atom
Zheng-Yuan Zhang, Han-Chao Chen, Xin Liu +15 more·Sep 29, 2025
The quantum Zeno effect (QZE) reveals that frequent measurements can suppress quantum evolution, but the detailed dynamics of the system under finite-duration measurements in experiments remain insufficiently explored. Here, we employ an optical dipo...
Magnon squeezing near a quantum critical point in a cavity-magnon-qubit system
Gang Liu, Gen Li, Rong-Can Yang +2 more·Sep 29, 2025
Preparing magnon nonclassical states is a central topic in the study of quantum magnonics. Here we propose to generate magnon squeezed states in a hybrid cavity-magnon-qubit system by engineering an effective Rabi-type magnon-qubit interaction. This ...
Non-Gaussian Quantum State Engineering with Postselected von Neumann Measurements
Xiao-Xi Yao, Yusuf Turek·Sep 29, 2025
We introduce a feasible protocol for generating non-Gaussian (nG) states via postselected von Neumann measurement for continuous-variable quantum information processing. The method uses a two-level system coupled to a Gaussian pointer state through a...
Path Integral Quantum Control for Quantum Chemistry Applications
Peyman Najafi, Aarón Villanueva, Hilbert Kappen·Sep 28, 2025
The Path integral Quantum Control (PiQC) algorithm was recently introduced by Villanueva et al. (2025) as a new approach for computing optimal controls in open and closed quantum systems. Originally proposed for pulse-based quantum control, PiQC esti...
Quantum calculation of the collision-induced line-shape effects in antiprotonic helium and the new accurate ab initio $\bar{p}$He$^{+}$-He potential energy surface
Hubert J. Jóźwiak, Dimitar Bakalov, Michał Przybytek +2 more·Sep 28, 2025
We present the first fully ab initio calculations of collision-induced broadening and shift of spectral lines in antiprotonic helium ($\bar{p}$He$^{+}$) perturbed by atomic helium. To overcome critical limitations of previous studies, we construct a ...
Tracking Quantum State Collapse/Decoherence in Real Time via a Superposition Trap
Hardeep Singh, Tim Kovachy·Sep 27, 2025
We propose a novel method for probing quantum state collapse and decoherence in real time using a mechanism we term the superposition trap. This approach exploits the continuity equation in quantum mechanics to engineer a configuration that spatially...
Comparison of wave-mixing processes in rarefied gas and QED vacuum using numerical simulations
Marianna Lytova, François Fillion-Gourdeau, Simon Vallières +3 more·Sep 26, 2025
We study the conditions required to distinguish laser-induced nonlinear quantum electrodynamics (QED) effects in vacuum from competing signals due to interactions of laser pulses with ionized residual gas. The latter is inevitably present in vacuum c...
Quantum Measurement Trees, II: Quantum Observables as Ortho-Measurable Functions and Density Matrices as Ortho-Probability Measures
Peter J. Hammond·Sep 26, 2025
Given a quantum state in the finite-dimensional Hilbert space $ \C^n $, the range of possible values of a quantum observable is usually identified with the discrete spectrum of eigenvalues of a corresponding Hermitian matrix. Here any such observable...