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

• URL: http://arxiv.org/abs/2008.02728v1
• Date: Thu, 6 Aug 2020 15:56:32 GMT
• Title: Quantum sensing of open systems: Estimation of damping constants and temperature
• Authors: Jiaxuan Wang, Luiz Davidovich and Girish Saran Agarwal
• Abstract summary: 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.
• Score: 1.2891210250935146
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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 pre-thermalization measurements, through a stream of single bosons, may lead to huge gain in precision.

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