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  • Letter

Information retrieval and eigenstate coalescence in a non-Hermitian quantum system with anti-PT symmetry

Liangyu Ding1, Kaiye Shi1, Yuxin Wang1, Qiuxin Zhang1, Chenhao Zhu1, Ludan Zhang1, Jiaqi Yi1, Shuaining Zhang1,2,3, Xiang Zhang1,2,3,* et al.

Wei Zhang1,2,3,†

  • 1Department of Physics, Renmin University of China, Beijing 100872, China
  • 2Beijing Academy of Quantum Information Sciences, Beijing 100193, China
  • 3Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872,China

  • *siang.zhang@ruc.edu.cn
  • †wzhangl@ruc.edu.cn
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Phys. Rev. A 105, L010204 – Published 20 January, 2022

DOI: https://doi.org/10.1103/PhysRevA.105.L010204

Abstract

Non-Hermitian systems with parity-time reversal (PT) or anti-PT symmetry have attracted a wide range of interest owing to their unique characteristics and counterintuitive phenomena. One of the most extraordinary features is the presence of an exceptional point, across which a phase transition with spontaneously broken PT symmetry takes place. We implement a Floquet Hamiltonian of a single qubit with anti-PT symmetry by periodically driving a dissipative quantum system of a single trapped ion. With stroboscopic emission and quantum state tomography, we obtain the time evolution of density matrix for an arbitrary initial state, and directly demonstrate information retrieval, eigenstate coalescence, and topological energy spectra as unique features of non-Hermitian systems.

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Phys. Rev. A 105, L010204– Published 20 January, 2022
  • Received 21 July 2021
  • Revised 13 November 2021
  • Accepted 5 January 2022
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