2020/05/31 by Dan-Bo Zhang, Guo-Qing Zhang, Zheng-Yuan Xue +3
Computer Science · Physics and Astronomy · #Computer science #Crossover #Open quantum system #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum algorithm #Quantum and electron transport phenomena #Quantum computer #Quantum many-body systems #Quantum mechanics #Quantum operation #Quantum simulator #Quantum system #Qubit #Statistical physics #cond-mat.stat-mech #cond-mat.str-el #quant-ph
paper · pdf · doi:10.1103/physrevlett.127.020502
published as Phys. Rev. Lett. 127, 020502 (2021) · 5 pages with supplementary material, comments are welcome
arxiv created 2020/05/31 · openalex publication_date 2021/07/08 · arxiv updated 2021/07/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Simulation of a quantum many-body system at finite temperatures is crucially important but quite challenging. Here we present an experimentally feasible quantum algorithm assisted with continuous variable for simulating quantum systems at finite temperatures. Our algorithm has a time complexity scaling polynomially with the inverse temperature and the desired accuracy. We demonstrate the quantum algorithm by simulating a finite temperature phase diagram of the quantum Ising and Kitaev models. It is found that the important crossover phase diagram of the Kitaev ring can be accurately simulated by a quantum computer with only a few qubits and thus the algorithm may be implementable on current quantum processors. We further propose a protocol with superconducting or trapped ion quantum computers.