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    題名: Probing entanglement dynamics and topological transitions on noisy intermediate-scale quantum computers
    作者: 林瑜琤
    Lin, Yu-Cheng;Chang, Huai-Chun;Hsu, Hsiu-Chuan
    貢獻者: 應物所
    日期: 2025-01
    上傳時間: 2024-12-12 09:27:43 (UTC+8)
    摘要: We simulate quench dynamics of the Su-Schrieffer-Heeger (SSH) chain on the IBM quantum computers, calculating the Rényi entanglement entropy, the twist order parameter and the Berry phase. The latter two quantities can be deduced from a slow-twist operator defined in the Lieb-Schultz-Mattis theorem. The Rényi entropy is obtained using a recently developed randomized measurement scheme. The twist order parameter and the Berry phase are measured without the need for additional gates or ancilla qubits. We consider quench protocols in which a trivial initial state evolves dynamically in time under the topological SSH Hamiltonian in the fully dimerized limit (the flat-band limit). During these quenches, there are persistent and periodic oscillations in the time evolution of both entanglement entropy and twist order parameter. Through the implementation of error mitigation techniques using a global depolarizing ansatz and postselection, our simulations on the IBM devices yield results that closely match exact solutions.
    關聯: Physical Review Research, Vol.7, 013043, pp.1-12
    資料類型: article
    DOI 連結: https://doi.org/10.1103/PhysRevResearch.7.013043
    DOI: 10.1103/PhysRevResearch.7.013043
    顯示於類別:[應用物理研究所 ] 期刊論文

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