Nonreciprocal generation of Schr?dinger cat state induced by topology
作者机构：Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education Jianghan University School of Physics and Institute for Quantum Science and Engineering Huazhong University of Science and Technologyand Wuhan Institute of Quantum Technology
出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学:物理学 力学 天文学(英文版))
年 卷 期：2024年
核心收录：
学科分类：07[理学] 070201[理学-理论物理] 0702[理学-物理学]
基 金：supported by the National Key Research and Development Program of China (Grant No. 2021YFA1400700) the National Natural Science Foundation of China (Grant Nos. 11974125, and 12147143)
摘 要：The Schr?dinger cat state produced differently in two directions is anticipated to be a critical quantum resource in quantum information technologies. By exploring the interplay between quantum nonreciprocity and topology in a one-dimensional microcavity array, we obtain the Schr?dinger cat state(a pure quantum state) in a chosen direction at the edge cavity, whereas a classical state in the other direction. This nonreciprocal generation of the cat state originates from the topologically protected chiralitymode excitation in the nontrivial phase, but in the trivial phase, the nonreciprocal generation of cat state vanishes. Thus, our proposal is switchable by tuning the parameters so that a topological phase transition occurs. Moreover, the obtained cat state has nonreciprocal high fidelity, nonclassicality, and quantum coherence, which are sufficient to be used in various one-way quantum technologies, e.g., invisible quantum sensing, noise-tolerant quantum computing, and chiral quantum networks. Our work provides a general approach to control quantum nonreciprocities with the topological effect, which substantially broadens the fields of nonreciprocal photonics and topological physics.
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