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Live trends in quantum computing research, updated daily from arXiv.
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Strain-engineered nanoscale spin polarization reversal in diamond nitrogen-vacancy centers
Zhixian Liu, Jiahao Sun, Ganyu Xu +7 more·Nov 7, 2025
The ability to control solid-state quantum emitters is fundamental to advancing quantum technologies. The performance of these systems is fundamentally governed by their spin-dependent photodynamics, yet conventional control methods using cavities of...
Adaptive quantum phase estimation can be better than non-adaptive
Noah Linden, Ronald de Wolf·Nov 7, 2025
Quantum phase estimation is one of the most important tools in quantum algorithms. It can be made non-adaptive (meaning all applications of the unitary $U_φ$ happen simultaneously) without using more applications of $U_φ$, albeit at the expense of us...
Spectroscopy and Coherence of an Excited-State Transition in $\text{Tm}^{3+}$:$\text{YAlO}_{3}$ at Telecommunication Wavelength
Luozhen Li, Akshay Babu Karyath, Mohsen Falamarzi Askarani +11 more·Nov 7, 2025
We characterize the spectroscopic and coherence properties of the 1451.37 nm excited-state zero-phonon line (ZPL) between the $^{3}F_{4}$ and the $^{3}H_{4}$ manifolds of a thulium-doped yttrium aluminum perovskite ($\text{Tm}^{3+}$:$\text{YAlO}_{3}$...
Mapping the positions of Two-Level-Systems on the surface of a superconducting transmon qubit
Jürgen Lisenfeld, Alexander K. Händel, Etienne Daum +3 more·Nov 7, 2025
The coherence of superconducting quantum computers is severely limited by material defects that create parasitic two-level-systems (TLS). Progress is complicated by lacking understanding how TLS are created and in which parts of a qubit circuit they ...
Quantum non-Markovian Hatano-Nelson model
Sumit Kumar Jana, Ryo Hanai, Tan Van Vu +2 more·Nov 7, 2025
While considering non-Hermitian Hamiltonians arising in the presence of dissipation, in most cases, the dissipation is taken to be frequency independent. However, this idealization may not always be applicable in experimental settings, where dissipat...
Open quantum-classical systems: A hybrid MASH master equation
Kasra Asnaashari, Jeremy O. Richardson·Nov 7, 2025
We propose a method which combines the quantum-classical mapping approach to surface hopping (MASH) with the dissipative quantum dynamics of the Lindblad master equation. Like conventional surface-hopping methods, our approach is based on classical t...
Variational noise mitigation in quantum circuits: the case of Quantum Fourier Transform
Rafael Gómez-Lurbe, Alexander Bernal, Armando Pérez +2 more·Nov 7, 2025
We propose using variational quantum algorithms (VQAs) to simulate established quantum algorithms under realistic noise conditions, aiming to surpass the fidelity of theoretical circuits in noisy environments. Focusing on the Quantum Fourier Transfor...
Shallow instantaneous quantum polynomial-time circuits for generative modeling on noisy intermediate-scale quantum hardware
Oriol Balló-Gimbernat, Marcos Arroyo-Sánchez, Paula García-Molina +2 more·Nov 7, 2025
Generative modeling is one of the most promising applications of quantum machine learning, yet training and deploying Quantum Generative Models (QGMs) on near-term hardware remains effectively intractable due to prohibitive gradient estimation and im...
Effects of boundary conditions on quantum nanoresonators: decoherence-free subspaces
Humberto C. F. Lemos, Thiago Cordeiro, Adelcio C. Oliveira·Nov 7, 2025
The Euler-Bernoulli beam model has been studied classically and semi-classically. The semi-classical quantization is done in an analogous way to the quantization of the electromagnetic field, and we found an effect that is similar to the Casimir effe...
Generating functions for quantum metric, Berry curvature, and quantum Fisher information matrix
Wei Chen·Nov 7, 2025
We elaborate that the fidelity between two density matrices is a generating function, through which the quantum Fisher information matrix and Christoffel symbol of the first kind in the parameter space can be obtained through derivatives with respect...
Convex semidefinite tensor optimization and quantum entanglement
Liding Xu, Ye-Chao Liu, Sebastian Pokutta·Nov 7, 2025
The cone of positive-semidefinite (PSD) matrices is fundamental in convex optimization, and we extend this notion to tensors, defining PSD tensors, which correspond to separable quantum states. We study the convex optimization problem over the PSD te...
A Gate-Based Quantum Genetic Algorithm for Real-Valued Global Optimization
Leandro C. Souza, Laurent E. Dardenne, Renato Portugal·Nov 7, 2025
We propose a gate-based Quantum Genetic Algorithm (QGA) for real-valued global optimization. In this model, individuals are represented by quantum circuits whose measurement outcomes are decoded into real-valued vectors through binary discretization....
A Triple-Hybrid Quantum Support Vector Machine Using Classical, Quantum Gate-based and Quantum Annealing-based Computing
Juan C. Boschero, Ward van der Schoot, Niels M. P. Neumann·Nov 7, 2025
Quantum machine learning is one of the fields where quantum computers are expected to bring advantages over classical methods. However, the limited size of current computers restricts the exploitation of the full potential of quantum machine learning...
Adaptive Entanglement-Aware Routing for Satellite Quantum Networks under Orbital and Atmospheric Variability
Dhrumil Bhatt, Vidushi Kumar·Nov 7, 2025
The expansion of satellite-based quantum networks requires adaptive routing mechanisms that can sustain entanglement under dynamic orbital and atmospheric conditions. Conventional schemes, often tailored to static or idealised topologies, fail to cap...
Scaling behavior of dissipative systems with imaginary gap closing
Jinghui Pi, Xingli Li, Yangqian Yan·Nov 7, 2025
Point-gap topology, characterized by spectral winding numbers, is crucial to non-Hermitian topological phases and dramatically alters real-time dynamics. In this paper, we study the evolution of quantum particles in dissipative systems with imaginary...
Revocation and Reconstruction of Shared Quantum States
Prakash Mudholkar, Chiranjeevi Vanarasa, Indranil Chakrabarty +1 more·Nov 7, 2025
The problem of revocation of quantum states after sharing is interesting and we ask: Is it possible for a dealer to revoke the state once shared, before the reconstruction process? Additional resources like bell states are used to help the dealer to ...
CUNQA: a Distributed Quantum Computing emulator for HPC
Jorge Vázquez-Pérez, Daniel Expósito-Patiño, Marta Losada +3 more·Nov 7, 2025
The challenge of scaling quantum computers to gain computational power is expected to lead to architectures with multiple connected quantum processing units (QPUs), commonly referred to as Distributed Quantum Computing (DQC). In parallel, there is a ...
Restricted-Geometry Quantum Models Beyond Atoms: Application of the Eckhardt-Sacha approach to NSDI in Diatomic Systems
Lars C. Bannow, Jan H. Thiede, Michał Ogryzek +2 more·Nov 7, 2025
We present a (1+1)-dimensional quantum model designed to describe nonsequential double ionization (NSDI) in homonuclear diatomic molecules exposed to strong linearly polarized laser fields. Extending the restricted-geometry framework previously devel...
Revivals and quantum carpets for the relativistic Schrödinger equation
Benoît Zumer, Florent Daem, Alexandre Matzkin·Nov 7, 2025
We investigate wavepacket dynamics for a relativistic particle in a box evolving according to the relativistic Schrödinger (also known as the Salpeter) equation. We derive the solutions for an infinite well -- which contrary to the standard relativis...
Optimization of Information Reconciliation for Decoy-State Quantum Key Distribution over a Satellite Downlink Channel
Thomas Scarinzi, Davide Orsucci, Marco Ferrari +1 more·Nov 7, 2025
Quantum key distribution (QKD) is a cryptographic solution that leverages the properties of quantum mechanics to be resistant and secure even against an attacker with unlimited computational power. Satellite-based links are important in QKD because t...