Papers
Live trends in quantum computing research, updated daily from arXiv.
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Quantum noise scaling in continuously operating multiparameter sensors
Aleksandra Sierant, Diana Méndez-Avalos, Santiago Tabares Giraldo +1 more·Feb 5, 2026
We experimentally investigate the quantum noise mechanisms that limit continuously operating multiparameter quantum sensors. Using a hybrid rf-dc optically pumped magnetometer, we map the photon shot noise, spin projection noise, and measurement back...
Efficient net-gain integrated optical parametric amplifier in the quantum regime
Yung-Cheng Kao, Jiaqi Huang, Ian Briggs +2 more·Feb 5, 2026
Optical parametric amplifiers (OPAs) are promising to overcome the wavelength coverage and noise limitations in conventional optical amplifiers based on rare-earth doping and semiconductor gain. However, the high power requirement remains a major obs...
Improving Ground State Accuracy of Variational Quantum Eigensolvers with Soft-coded Orthogonal Subspace Representations
Giuseppe Clemente, Marco Intini·Feb 5, 2026
We propose a new approach to improve the accuracy of ground state estimates in Variational Quantum Eigensolver (VQE) algorithms by employing subspace representations with soft-coded orthogonality constraints. As in other subspace-based VQE methods, s...
Improved Rodeo Algorithm Performance for Spectral Functions and State Preparation
Matthew Patkowski, Onat Ayyildiz, Katherine Hunt +2 more·Feb 5, 2026
The Rodeo Algorithm is a quantum computing method for computing the energy spectrum of a Hamiltonian and preparing its energy eigenstates. We discuss how to improve the performance of the rodeo algorithm for each of these two applications. In particu...
Does Cosmology require Hermiticity in Quantum Mechanics?
Oem Trivedi, Alfredo Gurrola·Feb 5, 2026
We explore the consequences of allowing non-Hermitian structures in quantum cosmology by extending the Wheeler DeWitt framework beyond strictly Hermitian dynamics. Using a controlled semiclassical reduction, we show how anti Hermitian contributions p...
One-Way Quantum Secure Direct Communication with Choice of Measurement Basis as the Secret
Santiago Bustamante, Boris A. Rodríguez, Elizabeth Agudelo·Feb 5, 2026
Motivated by the question of the distinguishability of ensembles described by the same compressed density operator, we propose a model for one-way quantum secure direct communication using finite ensembles of shared EPR pairs per bit and a public aut...
Extended Rydberg Lifetimes in a Cryogenic Atom Array
Junlan Jin, Yue Shi, Youssef Aziz Alaoui +4 more·Feb 5, 2026
We report on the realization of a $^{133}$Cs optical tweezer array in a cryogenic blackbody radiation (BBR) environment. By enclosing the array within a 4K radiation shield, we measure long Rydberg lifetimes, up to $406 (36)\,μ$s for the $55 P_{3/2}$...
Quantum Approximate Optimization of Integer Graph Problems and Surpassing Semidefinite Programming for Max-k-Cut
Anuj Apte, Sami Boulebnane, Yuwei Jin +3 more·Feb 5, 2026
Quantum algorithms for binary optimization problems have been the subject of extensive study. However, the application of quantum algorithms to integer optimization problems remains comparatively unexplored. In this paper, we study the Quantum Approx...
On the Efimov Effect for Four Particles in Dimension Two
Jonathan Rau, Marvin R. Schulz·Feb 5, 2026
We prove that the Schrödinger operator describing four particles in two dimensions, interacting solely through short-range three-body forces, can possess infinitely many bound states. This holds under the assumption that each three-body subsystem has...
Quantum Simulation of Bound and Resonant Doubly-Bottom Tetraquark
Ayanendu Dutta·Feb 5, 2026
We present the first quantum-simulation study of bound and resonant doubly-bottom tetraquark states within a QCD-inspired chiral quark model. An effective four-quark Hamiltonian is mapped onto a 16-qubit register, encoding color, spin, and spatial de...
"It from Bit": The Hartle-Hawking state and quantum mechanics for de Sitter observers
Ying Zhao·Feb 5, 2026
The one-state statement for closed universes has sparked considerable discussion. In this paper, we examine its physical meaning in the context of the Hartle-Hawking state and de Sitter space. We argue that the one-state property of closed universes ...
Task-Adaptive Physical Reservoir Computing via Tunable Molecular Communication Dynamics
Saad Yousuf, Kaan Burak Ikiz, Murat Kuscu·Feb 5, 2026
Physical Reservoir Computing (PRC) offers an efficient paradigm for processing temporal data, yet most physical implementations are static, limiting their performance to a narrow range of tasks. In this work, we demonstrate in silico that a canonical...
An Approach to Probing Particles and Quasi-particles in the Condensed Bose-Hubbard Model
Huy Nguyen, Yu-Xin Wang, Jacob M. Taylor·Feb 5, 2026
Measurement plays a crucial role in a quantum system beyond just learning about the system state: it changes the post-measurement state and hence influences the subsequent time evolution; further, measurement can even create entanglement in the post-...
Quantum Reinforcement Learning with Transformers for the Capacitated Vehicle Routing Problem
Eva Andrés·Feb 5, 2026
This paper addresses the Capacitated Vehicle Routing Problem (CVRP) by comparing classical and quantum Reinforcement Learning (RL) approaches. An Advantage Actor-Critic (A2C) agent is implemented in classical, full quantum, and hybrid variants, integ...
Quantum Error Mitigation at the pre-processing stage
Juan F. Martin, Giuseppe Cocco, Javier Fonollosa·Feb 5, 2026
The realization of fault-tolerant quantum computers remains a challenging endeavor, forcing state-of-the-art quantum hardware to rely heavily on noise mitigation techniques. Standard quantum error mitigation is typically based on post-processing stra...
Local measurements and the entanglement transition in quantum spin chains
Sven Bachmann, Mahsa Rahnama, Gabrielle Tournaire·Feb 5, 2026
We consider the transition between short-range entangled (SRE) and long-range ordered (and therefore long-range entangled) states of infinite quantum spin chains, which is induced by local measurements. Specifically, we assume that the initial state ...
Thermal-Drift Sampling: Generating Thermal Ensembles for Learning Many-Body Systems
Jiyu Jiang, Mingrui Jing, Jizhe Lai +2 more·Feb 5, 2026
Thermal equilibrium states of many-body Hamiltonians are essential for probing quantum chaos, finite-temperature phases of matter, and training quantum machine learning models, yet generating large collections of such states across different Hamilton...
Spontaneous Parity Breaking in Quantum Antiferromagnets on the Triangular Lattice
Songtai Lv, Yuchen Meng, Haiyuan Zou·Feb 5, 2026
Frustration on the triangular lattice has long been a source of intriguing and often debated phases in many-body systems. Although symmetry analysis has been employed, the role of the seemingly trivial parity symmetry has received little attention. I...
Reducing the Computational Cost Scaling of Tensor Network Algorithms via Field-Programmable Gate Array Parallelism
Songtai Lv, Yang Liang, Rui Zhu +2 more·Feb 5, 2026
Improving the computational efficiency of quantum many-body calculations from a hardware perspective remains a critical challenge. Although field-programmable gate arrays (FPGAs) have recently been exploited to improve the computational scaling of al...
Giant bubbles of Fisher zeros in the quantum XY chain
Songtai Lv, Yang Liu, Erhai Zhao +2 more·Feb 5, 2026
We demonstrate an alternative approach based on complex-valued inverse temperature and partition function to probe quantum phases of matter with nontrivial spectra and dynamics. It leverages thermofield dynamics (TFD) to quantitatively characterize q...