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Live trends in quantum computing research, updated daily from arXiv.
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Magic spreading under unitary Clifford dynamics
Mircea Bejan, Pieter W. Claeys, Jiangtian Yao·Nov 26, 2025
Nonstabilizerness, or quantum magic, presents a valuable resource in quantum error correction and computation. We study the dynamics of locally injected magic in unitary Clifford circuits, where the total magic is conserved. However, the absence of p...
Quantum Analytical Mechanics: Quantum Mechanics with Hidden Variables
Wolfgang Paul·Nov 26, 2025
The question about the existence of so-called ``hidden'' variables in quantum mechanics and the perception of the completeness of quantum mechanics are two sides of the same coin. Quantum analytical mechanics constitutes a completion of standard quan...
Quantum electrodynamic description of the neutral hydrogen molecule ionization
Hui-hui Miao·Nov 26, 2025
The ionization dynamics of a hydrogen molecule, serving as a fundamental benchmark in quantum chemistry, is investigated within a comprehensive framework combining quantum electrodynamics and the Lindblad master equation. This approach enables a firs...
New quasi-exactly solvable systems from SUSYQM and Bethe Ansatz
Siyu Li, Ian Marquette, Yao-Zhong Zhang·Nov 26, 2025
We give a systematic construction of new quasi-exactly solvable systems via Bethe ansatz and supersymmetric quantum mechanics (SUSYQM). Methods based on the intertwining of supercharges have been extensively used in the literature for exactly solvabl...
Phase-Dependent Photon Emission Rates in Quantum Gravity-Induced Entangled States
Chi Zhang·Nov 26, 2025
Quantum entanglement, as one of the fundamental concepts in quantum mechanics, has garnered significant attention over the past few decades for its extraordinary nonlocality. With the advancement of quantum technology, quantum entanglement holds prom...
Kibble-Zurek Meets Tricriticality: Breakdown of Adiabatic-Impulse and New Scaling Forms
Chengshu Li·Nov 26, 2025
The Kibble-Zurek effect is studied around a tricritical point, where the adiabatic-impulse scenario breaks down. Several new scaling forms are also proposed.
Excited core-level dependence of entanglement between a photoelectron and an emitted X-ray photon in X-ray inner-shell excitation
Ryo B. Tanaka, Goro Oohata, Takayuki Uozumi·Nov 26, 2025
We theoretically investigated how the quantum entanglement between the spin of the photoelectron and the polarization of the emitted X-ray photon depends on the excited core-level, using the 3$d\rightarrow\ $2$p$ and 3$d\rightarrow\ $3$p$ SPR-XEPECS ...
Deriving the Generalised Born Rule from First Principles
Gaurang Agrawal, Matt Wilson·Nov 26, 2025
A basic postulate of modern compositional approaches to generalised physical theories is the generalised Born rule, in which probabilities are postulated to be computable from the composition of states and effects. In this paper we consider whether t...
Large-scale portfolio optimization using Pauli Correlation Encoding
Vicente P. Soloviev, Michal Krompiec·Nov 26, 2025
Portfolio optimization is a cornerstone of financial decision-making, traditionally relying on classical algorithms to balance risk and return. Recent advances in quantum computing offer a promising alternative, leveraging quantum algorithms to effic...
Floquet thermalization by power-law induced permutation symmetry breaking
Manju C, Uma Divakaran·Nov 26, 2025
Permutation symmetry plays a central role in the understanding of collective quantum dynamics. On the other hand, interactions are rarely uniform in real systems. By introducing power law couplings that algebraically decay with the distance between t...
The Quantum Agreement Theorem
María García Díaz, Adam Brandenburger, Giannicola Scarpa·Nov 26, 2025
We formulate and prove an Agreement Theorem for quantum mechanics (QM), describing when two agents, represented by separate laboratories, can or cannot maintain differing probability estimates of a shared quantum property of interest. Building on the...
Finite-key security analysis of the decoy-state BB84 QKD with passive measurement
Akihiro Mizutani, Shun Kawakami, Go Kato·Nov 26, 2025
The decoy-state Bennett-Brassard 1984 (BB84) quantum key distribution (QKD) protocol is widely regarded as the de facto standard for practical implementations. On the receiver side, passive basis choice is attractive because it significantly reduces ...
The effects of decoherence on Fermi's golden rule
Caihong Zheng, Fan Zheng·Nov 26, 2025
Fermi's golden rule which describes the transition rates between two electronic levels under external stimulations is used ubiquitously in different fields of physics. The original Fermi's golden rule was derived from perturbative time-dependent Schr...
Cost-effective scalable quantum error mitigation for tiled Ansätze
Oskar Graulund Lentz Rasmussen, Erik Kjellgren, Peter Reinholdt +4 more·Nov 26, 2025
We introduce a cost-effective quantum error mitigation technique that builds on the recent Ansatz-based gate and readout error mitigation method (M0). The technique, tiled M0, leverages the unique structure of tiled Ansätze (e.g., tUPS, QNP, hardware...
Phase Estimation with Compressed Controlled Time Evolution
Erenay Karacan·Nov 26, 2025
Many optimally scaling quantum simulation algorithms employ controlled time evolution of the Hamiltonian, which is typically the major bottleneck for their efficient implementation. This work establishes a compression protocol for encoding the contro...
Nucleation and wetting transitions in three-component Bose-Einstein condensates in Gross-Pitaevskii theory: exact results
Jonas Berx, Nguyen Van Thu, Joseph O. Indekeu·Nov 26, 2025
Nucleation and wetting transitions are studied in a three-component Bose-Einstein condensate mixture within Gross-Pitaevskii theory. For special cases of intermediate segregation between components 1 and 2, the nucleation phase transition of a surfac...
Geometric Entanglement Entropy on Projective Hilbert Space
Loris Di Cairano·Nov 26, 2025
Entanglement for pure bipartite states is most commonly quantified in a state-by-state manner to each pure state of a bipartite system a scalar quantity, such as the von Neumann entropy of a reduced density matrix. This provides a precise local chara...
Vortex-Enhanced Zitterbewegung in Relativistic Electron Wave Packets
Zhongze Guo, Bei Xu, Qiang Gu·Nov 26, 2025
Zitterbewegung (ZBW), the trembling motion predicted by the Dirac equation, has long remained unobservable in free electrons due to its sub-Compton scale. We elaborately construct a relativistic vortex electron wave packet as a coherent superposition...
Tip-enhanced quantum-sensing spectroscopy for bright and reconfigurable solid-state single-photon emitters
Hyeongwoo Lee, Taeyoung Moon, Hyeonmin Oh +5 more·Nov 26, 2025
Atom-like defects in hexagonal boron nitride (hBN) provide room-temperature single-photon emission and coherent spin states, making them attractive for quantum-computing and -sensing applications. However, their random spatial and spectral characteri...
Quantum Hard Spheres with Affine Quantization
Riccardo Fantoni·Nov 26, 2025
We study a fluid of quantum hard-spheres treated with affine-quantization. Assuming that the fluid obeys to Bose-Einstein statistics we solve for its thermodynamic properties using the path integral Monte Carlo method.