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Quantum metrology of phase for accelerated two-level atom coupled with electromagnetic field with and without boundary

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Abstract

We study how to improve the precision of the quantum estimation of phase for an uniformly accelerated atom in fluctuating electromagnetic field by reflecting boundaries. We find that the precision decreases with increases of the acceleration without the boundary. With the presence of a reflecting boundary, the precision depends on the atomic polarization, position and acceleration, which can be effectively enhanced compared to the case without boundary if we choose the appropriate conditions. In particular, with the presence of two parallel reflecting boundaries, we obtain the optimal precision for atomic parallel polarization and the special distance between two boundaries, as if the atom were shielded from the fluctuation.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China under Grant Nos. 11475061 and 11305058. X. Liu was supported by the Hunan Provincial Innovation Foundation For Postgraduate under Grant No. CX2017B175.

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Authors and Affiliations

  1. Department of Physics, Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha, 410081, Hunan, People’s Republic of China

    Ying Yang, Xiaobao Liu, Jieci Wang & Jiliang Jing

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  1. Ying Yang
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  2. Xiaobao Liu
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  4. Jiliang Jing
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Correspondence to Jiliang Jing.

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Yang, Y., Liu, X., Wang, J. et al. Quantum metrology of phase for accelerated two-level atom coupled with electromagnetic field with and without boundary. Quantum Inf Process 17, 54 (2018). https://doi.org/10.1007/s11128-018-1815-z

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