Adiabatic state preparation for digital quantum simulations of QED in 1+1D

IF 5 2区物理与天体物理 Q1 Physics and Astronomy

Physical Review D Pub Date : 2025-05-21 DOI:10.1103/physrevd.111.094514

Matteo D’Anna, Marina Krstić Marinković, Joao C. Pinto Barros

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引用次数: 0

Abstract

Quantum electrodynamics in 1+1D (QED2) shares intriguing properties with quantum chromodynamics (QCD), including confinement, string breaking, and interesting phase diagram when the nontrivial topological θ-term is considered. Its lattice regularization is a commonly used toy model for quantum simulations of gauge theories on near-term quantum devices. In this work, we address algorithms for adiabatic state preparation in digital quantum simulations of QED2. We demonstrate that, for specific choices of parameters, the existing adiabatic procedure leads to level crossing between states of different charge sectors, preventing the correct preparation of the ground state. We further propose a new adiabatic Hamiltonian and verify its efficiency in targeting systems with a nonzero topological θ-term and in studying string breaking phenomena.

Published by the American Physical Society

2025

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1+1D中QED数字量子模拟的绝热态制备

当考虑非平凡拓扑θ-项时，1+1D中的量子电动力学（QED2）与量子色动力学（QCD）具有有趣的特性，包括约束、弦断裂和有趣的相图。它的晶格正则化是近期量子器件规范理论量子模拟中常用的玩具模型。在这项工作中，我们解决了在QED2的数字量子模拟中绝热态制备的算法。我们证明，对于特定的参数选择，现有的绝热过程会导致不同电荷扇区的状态之间的水平交叉，从而阻止基态的正确制备。我们进一步提出了一种新的绝热哈密顿量，并验证了它在瞄准具有非零拓扑θ-项的系统和研究弦断现象方面的有效性。2025年由美国物理学会出版

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来源期刊

Physical Review D 物理-天文与天体物理

CiteScore

9.20

自引率

36.00%

发文量

审稿时长

2 months

期刊介绍： Physical Review D (PRD) is a leading journal in elementary particle physics, field theory, gravitation, and cosmology and is one of the top-cited journals in high-energy physics. PRD covers experimental and theoretical results in all aspects of particle physics, field theory, gravitation and cosmology, including: Particle physics experiments, Electroweak interactions, Strong interactions, Lattice field theories, lattice QCD, Beyond the standard model physics, Phenomenological aspects of field theory, general methods, Gravity, cosmology, cosmic rays, Astrophysics and astroparticle physics, General relativity, Formal aspects of field theory, field theory in curved space, String theory, quantum gravity, gauge/gravity duality.