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Paper   IPM / P / 17213
School of Physics
  Title:   Operational significance of nonclassicality in nonequilibrium Gaussian quantum thermometry
1.  S. S. Mirkhalaf
2.  M. Mehboudi
3.  S. Rahimi-Keshari
  Status:   Preprint
  Year:  2023
  Supported by:  IPM
We provide a new operational significance of nonclassicality in nonequilibrium temperature estimation of bosonic baths with Gaussian dynamics and probing with Gaussian states. We find a bound on the thermometry performance using classical probe states. Then we show that by using nonclassical probe states, single-mode and two-mode squeezed vacuum states, one can profoundly improve the classical limit. Interestingly, we observe that this improvement can also be achieved by using Gaussian measurements. Hence, we propose a fully Gaussian protocol for enhanced thermometry, which can simply be realized and used in quantum optics platform.

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