Criticality-enhanced quantum sensor at finite temperature

• URL: http://arxiv.org/abs/2110.07824v1
• Date: Fri, 15 Oct 2021 02:39:31 GMT
• Title: Criticality-enhanced quantum sensor at finite temperature
• Authors: Wei Wu and Chuan Shi
• Abstract summary: We propose a thermodynamic-criticality-enhanced quantum sensing scenario at finite temperature. It is revealed that the thermodynamic criticality of the Dicke model can significantly improve the sensing precision.
• Score: 44.23814225750129
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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 employed as a quantum sensor to estimate parameters of interest in the Dicke model which experiences a thermodynamic phase transition. It is revealed that the thermodynamic criticality of the Dicke model can significantly improve the sensing precision. Enriching the scope of quantum critical metrology, our finding provides a possibility to realize highly sensitive quantum sensing without cooling.

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