Improved thermometry of low-temperature quantum systems by a ring-structure probe

Li-Sha Guo, Bao-Ming Xu, Jian Zou, and Bin Shao
Phys. Rev. A 92, 052112 – Published 17 November 2015

Abstract

The thermometry precision of a sample is a question of both fundamental and technological importance. In this paper, we consider a ring-structure system as our probe to estimate the temperature of a bath. Based on the Markovian master equation of the probe, we calculate the quantum Fisher information (QFI) of the probe at any time. We find that for the thermal equilibrium thermometry, the ferromagnetic structure can measure a lower temperature of the bath with a higher precision compared with the nonstructure probe, while for the dynamical thermometry, the antiferromagnetic structure can make the QFI of the probe in the dynamical process much larger than that in equilibrium with the bath, which is somewhat counterintuitive. Moreover, the best accuracy for the thermometry achieved in the antiferromagnetic structure case can be much higher than that in the nonstructure case. The physical mechanisms of the above phenomena are given in this paper.

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  • Received 18 July 2015

DOI:https://doi.org/10.1103/PhysRevA.92.052112

©2015 American Physical Society

Authors & Affiliations

Li-Sha Guo, Bao-Ming Xu, Jian Zou*, and Bin Shao

  • School of Physics, Beijing Institute of Technology, Beijing 100081, China

  • *zoujian@bit.edu.cn

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Vol. 92, Iss. 5 — November 2015

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