Quantum sensing of open systems: Estimation of damping constants and temperature

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Abstract

We determine quantum precision limits for estimation of damping constants and temperature of lossy bosonic channels. A direct application would be the use of light for estimation of the absorption and the temperature of a transparent slab. Analytic lower bounds are obtained for the uncertainty in the estimation, through a purification procedure that replaces the master equation description by a unitary evolution involving the system and ad hoc environments. For zero temperature, Fock states are shown to lead to the minimal uncertainty in the estimation of damping, with boson-counting being the best measurement procedure. In both damping and temperature estimates, sequential prethermalization measurements, through a stream of single bosons, may lead to huge gain in precision.

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APA

Wang, J., Davidovich, L., & Agarwal, G. S. (2020). Quantum sensing of open systems: Estimation of damping constants and temperature. Physical Review Research, 2(3). https://doi.org/10.1103/PhysRevResearch.2.033389

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