Abstract
The Schrödinger 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 Schrödinger 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 chirality-mode 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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This work was supported by the National Key Research and Development Program of China (Grant No. 2021YFA1400700), and the National Natural Science Foundation of China (Grant Nos. 11974125, and 12147143).
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Li, ZH., Zheng, LL., Wu, Y. et al. Nonreciprocal generation of Schrödinger cat state induced by topology. Sci. China Phys. Mech. Astron. 67, 240313 (2023). https://doi.org/10.1007/s11433-023-2301-2
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DOI: https://doi.org/10.1007/s11433-023-2301-2