High-precision estimation of the parameters in the reservoir via the two-level system

• URL: http://arxiv.org/abs/2105.02518v1
• Date: Thu, 6 May 2021 08:44:55 GMT
• Title: High-precision estimation of the parameters in the reservoir via the two-level system
• Authors: Mengmeng Luo (1), Wenxiao Liu (2), Yuetao Chen (1) and Shaoyan Gao (1) ((1) School of Physics, Xi'an Jiaotong University, P.R.China, (2) Department of Physics and Electronics, North China University of Water Resources and Electric Power, China)
• Abstract summary: We find entangled state and optimal superposition state are beneficial for parameter estimation with one-qubit probe. The phenomenon of quantum Fisher information return occurs when the detuning or the temperature is estimated.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: A scheme is proposed to estimate the system and environmental parameter, the detuning, temperature and the squeezing strength with a high precision by the two-level atom system. It hasn't been reported that the squeezing strength estimation through quantum Fisher information. We find entangled state and optimal superposition state are beneficial for parameter estimation with one-qubit probe by calculating quantum Fisher information and fidelity. And the fidelity between initial and final states of the atom can be improved via the two-qubit probe. Moreover, the phenomenon of quantum Fisher information return occurs when the detuning or the temperature is estimated. Our work provides a basis for precision measurement technology and quantum information processing.

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