Criticality-enhanced quantum sensor at finite temperature

  title={Criticality-enhanced quantum sensor at finite temperature},
  author={Wei Wu and Chuan Shi},
  journal={Physical Review A},
  • Wei Wu, Chuan Shi
  • Published 23 August 2021
  • Physics
  • Physical Review A
Conventional criticality-based quantum metrological schemes work only at zero or very low temperature because the quantum uncertainty around the quantum phase-transition point is generally erased by thermal fluctuations with the increase of temperature. Such an ultralow-temperature requirement severely restricts the development of quantum critical metrology. In this paper, we propose a thermodynamic-criticality-enhanced quantum sensing scenario at finite temperature. In our scheme, a qubit is… 

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