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Quantum thermometry in electromagnetic field of cosmic string spacetime

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Abstract

A scheme for enhancing the quantum Fisher information of quantum thermometry is proposed where the detector used to explore the thermal bath in cosmic string spacetime is a two-level atom which is coupled to electromagnetic fields. By deriving its dynamical evolution via the method of open quantum system, our scheme indicates the quantum Fisher information of temperature depends on the deficit angle, evolution time, detector initial state, polarization direction, the temperature itself and its position. Our results show the quantum Fisher information can finally be maximized by the estimation of local measurements, and therefore, the precision of estimation can be improved.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China under Grant Nos. 12105097, 11905218, and supported by Scientific Research Fund of Hunan Provincial Education Department under Grant Nos. 20C0787, 20C0785, 19B206.

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Authors and Affiliations

  1. Hunan Provincial Key Laboratory of Intelligent Sensors and Advanced Sensor Materials, School of Physics and Electronics, Hunan University of Science and Technology, Xiangtan, 411201, China

    Ying Yang

  2. Department of Physics, Key Laboratory of Intelligent Sensors and Advanced Sensor Materials, Hunan University of Science and Technology, Xiangtan, Hunan, 411201, People’s Republic of China

    Yuqing Zhang & Chunxia Jia

  3. 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, Hunan, 410081, People’s Republic of China

    Jiliang Jing

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  1. Ying Yang
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Yang, Y., Zhang, Y., Jia, C. et al. Quantum thermometry in electromagnetic field of cosmic string spacetime. Quantum Inf Process 22, 18 (2023). https://doi.org/10.1007/s11128-022-03768-3

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