Quantum metrology out of equilibrium

Sholeh Razavian and Matteo G.A. Paris

Physica A: Statistical Mechanics and its Applications, 2019, vol. 525, issue C, 825-833

Abstract: We address open quantum systems out-of-equilibrium as effective quantum probes for the characterisation of their environment. We discuss estimation schemes for parameters driving a de-phasing evolution of the probe and then focus on qubits, establishing a relationship between the quantum Fisher information and the residual coherence of the probe. Finally, we apply our results to the characterisation of the ohmicity parameter of a bosonic environment.

Keywords: Quantum probes; Complex systems; Ohmic reservoirs (search for similar items in EconPapers)
Date: 2019
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:525:y:2019:i:c:p:825-833

DOI: 10.1016/j.physa.2019.03.125

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