Nonreciprocal Generation of Schr\"{o}dinger Cat State Induced by Topology

• URL: http://arxiv.org/abs/2312.10444v1
• Date: Sat, 16 Dec 2023 13:30:11 GMT
• Title: Nonreciprocal Generation of Schr\"{o}dinger Cat State Induced by Topology
• Authors: Zi-Hao Li, Li-Li Zheng, Ying Wu, Xin-You L\"u
• Abstract summary: We explore the interplay between quantum nonreciprocity and topology in a one-dimensional microcavity array. We obtain the Schr"odinger cat state in a chosen direction at the edge cavity, whereas a it classical state in the other direction. The obtained cat state has nonreciprocal high fidelity, nonclassicality, and quantum coherence.
• Score: 16.939175598826477
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The Schr\"{o}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\"{o}dinger cat state ({\it a pure quantum state}) in a chosen direction at the edge cavity, whereas a {\it classical state} in the other direction. This {\it nonreciprocal generation of the cat state} originates from the {\it topologically protected chirality-mode excitation} in the nontrivial phase, but in the trivial phase the {\it 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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