Nonreciprocal PT-symmetric phase transition in a non-Hermitian chiral quantum optical system

• URL: http://arxiv.org/abs/2404.12860v2
• Date: Mon, 22 Apr 2024 02:19:12 GMT
• Title: Nonreciprocal PT-symmetric phase transition in a non-Hermitian chiral quantum optical system
• Authors: Miao Cai, Jiang-Shan Tang, Ming-Yuan Chen, Keyu Xia,
• Abstract summary: We show nonreciprocal parity-time-symmetric phase transition in a non-Hermitian quantum electrodynamical system. Results may deepen the fundamental insight of nonreciprocal and non-Hermitian quantum physics.
• Score: 1.143707646428782
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Phase transitions, non-Hermiticity and nonreciprocity play central roles in fundamental physics. However, the triple interplay of these three fields is of lack in the quantum domain. Here, we show nonreciprocal parity-time-symmetric phase transition in a non-Hermitian chiral quantum electrodynamical system, caused by the directional system dissipation. In remarkable contrast to previously reported nonreciprocal phase transitions, the nonreciprocal parity-time-symmetric phases appear even when the atom-resonator coupling is reciprocal. Nonreciprocal photon blockade is obtained in the nonreciprocal phase region. These results may deepen the fundamental insight of nonreciprocal and non-Hermitian quantum physics, and also open a new door for unconventional quantum manipulation.

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