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Steady and optimal entropy squeezing of a two-level atom with quantum-jump-based feedback and classical driving in a dissipative cavity

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Abstract

We investigate the entropy squeezing of a two-level atom coupled to a dissipative cavity under two different controls: In the first case, quantum-jump-based feedback is alone applied, whereas in the second case we consider the combined effect of quantum-jump-based feedback and classical driving, in which we provide a scheme to generate and protect steady and optimal entropy squeezing of the two-level atom. The results show that the entropy squeezing of atomic polarization components greatly depends on the control of quantum-jump-based feedback and classical driving. Under the condition of designing proper quantum-jump-based feedback parameters, the entropy squeezing can be generated and protected. Furthermore, when both quantum-jump-based feedback and classical driving are simultaneously applied, steady and optimal entropy squeezing of the two-level atom can be obtained even though there is initially no entropy squeezing, which is explained by making use of the steady-state solution of the atom.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (Grant No. 11374096).

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Authors and Affiliations

  1. Department of Physics and Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University, Changsha, 410081, China

    Min Yu & Mao-Fa Fang

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  1. Min Yu
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  2. Mao-Fa Fang
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Correspondence to Mao-Fa Fang.

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Yu, M., Fang, MF. Steady and optimal entropy squeezing of a two-level atom with quantum-jump-based feedback and classical driving in a dissipative cavity. Quantum Inf Process 15, 4175–4187 (2016). https://doi.org/10.1007/s11128-016-1407-8

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  • DOI: https://doi.org/10.1007/s11128-016-1407-8

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