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Live trends in quantum computing research, updated daily from arXiv.
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A quantum model for constrained Markowitz modern portfolio using slack variables to process mixed-binary optimization under QAOA
Pablo Thomassin, G. Guérard, S. Djebali +1 more·Nov 10, 2025
Effectively encoding inequality constraints is a primary obstacle in applying quantum algorithms to financial optimization. A quantum model for Markowitz portfolio optimization is presented that resolves this by embedding slack variables directly int...
A Hierarchy of Fibonacci Forbidden-Word Hamiltonians: From the Golden Chain to the Plastic Chain and Aperiodic Order
Marcelo Maciel Amaral·Nov 9, 2025
We introduce an infinite, scale-aligned hierarchy of one-dimensional, frustration-free Hamiltonians by forbidding the minimal forbidden factors of the Fibonacci word up to length $F_K$, the $K$-th Fibonacci number. The ground-state languages have exp...
Causal measurement in quantum field theory: spacetime
Robert Oeckl·Nov 9, 2025
We provide a framework and explicit construction for the regularized measurement of a large class of spacetime-localized observables in bosonic quantum field theory. The measurements fully satisfy relativistic causality and causal transparency, i.e.,...
High-quality nanostructured diamond membranes for nanoscale quantum sensing
Alexander Pakpour Tabrizi, Artur Lozovoi, Sean Karg +4 more·Nov 9, 2025
Deploying nitrogen vacancy (NV) centers in diamond as nanoscale quantum sensors for condensed matter and materials physics requires placing the NV centers close to the sensing target. One solution is to fabricate diamond nanostructures and integrate ...
Flux-modulated tunable interaction regimes in two strongly nonlinear oscillators
J. D. Koenig, G. Barbieri, F. Fani Sani +3 more·Nov 9, 2025
The ability to efficiently simulate a variety of interacting quantum systems on a single device is an overarching goal for digital and analog quantum simulators. In circuit quantum electrodynamical systems, strongly nonlinear superconducting oscillat...
Resonating valence bond pairing energy in graphene by quantum Monte Carlo
S. Azadi, A. Principi, T. D. Kühne +1 more·Nov 9, 2025
We determine the resonating-valence-bond (RVB) state in graphene using real-space quantum Monte Carlo with correlated variational wave functions. Variational and diffusion quantum Monte Carlo (DMC) calculations with Jastrow-Slater-determinant and Jas...
Quantum Monads in Phase Space and Related Toeplitz Operators
Maurice de Gosson·Nov 9, 2025
In earlier work, we introduced quantum blobs as minimum-uncertainty symplectic ellipsoids in phase space. These objects may be viewed as geometric monads in the Leibnizian sense, representing the elementary units of phase-space structure consistent w...
Generalized State Discrimination for Tunable Quantum Key Distribution: The phiQKD Protocol
Animesh Banik, Md. Shihab Khan, Rafid Masrur Khan +2 more·Nov 9, 2025
We introduce a tunable framework for generalized quantum state discrimination (GSD) and apply it to quantum key distribution (QKD) through a protocol we call phiQKD. Building upon the two-state B92 protocol, phiQKD replaces the traditional unambiguou...
Metamagnetic Transition in Low-Dimensional Site-Decorated Quantum Heisenberg Ferrimagnets
Weiguo Yin, A. M. Tsvelik·Nov 9, 2025
The prohibition of finite-temperature phase transition in one-dimensional (1D) Ising models and 1D/2D quantum Heisenberg models with short-range interactions fundamentally constrains the application potentials of low-dimensional magnetic materials. R...
Evaluating Large Language Models on Quantum Mechanics: A Comparative Study Across Diverse Models and Tasks
S. K. Rithvik·Nov 9, 2025
We present a systematic evaluation of large language models on quantum mechanics problem-solving. Our study evaluates 15 models from five providers (OpenAI, Anthropic, Google, Alibaba, DeepSeek) spanning three capability tiers on 20 tasks covering de...
Exploring Replica Symmetry Breaking and Topological Collapse in Spin Glasses with Quantum Annealing
Kumar Ghosh·Nov 9, 2025
Replica symmetry breaking (RSB) underlies the complex organization of disordered systems, yet quantitative validation beyond $N \sim 100$ spins has remained computationally challenging. We use quantum annealing to access ground states of the Sherring...
Metabolic quantum limit to the information capacity of magnetoencephalography
E. Gkoudinakis, S. Li, I. K. Kominis·Nov 9, 2025
Magnetoencephalography, the noninvasive measurement of magnetic fields produced by brain activity, utilizes quantum sensors such as superconducting quantum interference devices and atomic magnetometers. Combining the energy resolution limit of magnet...
A Collapse Mechanism Without Heating
Felix Finster, Claudio F. Paganini·Nov 9, 2025
It is shown that the collapse model derived from the theory of causal fermion systems does not give rise to a heating of the probe. Experimental consequences are worked out. The connections to the continuous spontaneous localization (CSL) model and t...
Equivalence and Divergence of Imaginary-Time Evolution and Gradient Descent for Gaussian Variational States
Yash Palan·Nov 9, 2025
Imaginary-time evolution (ITE) is one of the most widely used numerical techniques for obtaining ground states of many-body Hamiltonians. In this work, we compare ITE with gradient descent (GD) within the framework of Gaussian wavefunction ansatze. W...
High-Fidelity Controlled-Phase Gate for Binomial Codes via Geometric Phase Engineering
Yifang Xu, Yilong Zhou, Lida Sun +12 more·Nov 9, 2025
High-fidelity two-logical-qubit gates are essential for realizing fault-tolerant quantum computation with bosonic codes, yet experimentally reported fidelities have rarely exceeded 90\%. Here, we propose a geometric phase engineering approach for imp...
Magnon-Squeezing-Induced Nonreciprocal Quantum Coherence in a Cavity Magnomechanical System
Abdelkader Hidki, Amjad Sohail, Tesfay Gebremariam Tesfahannes +2 more·Nov 9, 2025
We investigate quantum coherence in a hybrid cavity magnomechanical system incorporating a squeezed-magnon drive. By analyzing the Gaussian quantum coherence of the cavity, magnonic, and mechanical subsystems, as well as the total system coherence, w...
Magnetic and structural properties of epitaxial Er-substituted yttrium iron garnet films grown by pulsed laser deposition
Lukas Flajsman, Lars Peeters, Armi Kosunen +3 more·Nov 9, 2025
Er-substituted yttrium iron garnet (Er:YIG) holds the potential of combining the low magnetic damping of YIG with the telecom-band optical transitions of $\text{Er}^{3+}$ ions, making it a suitable material for hybrid optomagnonic devices and microwa...
Spontaneous emission of a three-level artificial atom in a one-dimensional open waveguide
O. A. Chuikin, Ya. S. Greenberg, O. V. Kibis·Nov 9, 2025
We study the dynamical and spectral characteristics of a quantum three-level ladder system, interacting with a continuous electromagnetic field in one-dimensional open waveguide. Common realization of such systems is a waveguide QED setup - a superco...
Hybrid Real-Imaginary Time Evolution for Low-Depth Hamiltonian Simulation in Quantum Optimization
Fei Li, Xiao-Wei Li·Nov 9, 2025
Counterdiabatic (CD) driving is a powerful technique for accelerating adiabatic quantum computing. However, it becomes self-limiting in complex optimizations like the Sherrington-Kirkpatrick model: long evolution times $T$ needed to traverse crossing...
Finite-sample deviations and convergence in the statistics of Bohmian trajectory ensembles
Bingyu Cui, Yanting Cao·Nov 9, 2025
We analyze finite-sample statistics of Bohmian trajectories for single spinless and spin-1/2 particles. Equivariance ensures agreement with $|ψ|^2$ in the quantum equilibrium limit, yet experiments and simulations necessarily use finite ensembles. We...