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.

Quantum metrology out of equilibrium / S. Razavian, M.G.A. Paris. - In: PHYSICA. A. - ISSN 0378-4371. - 525(2019 Jul 01), pp. 825-833. [10.1016/j.physa.2019.03.125]

Quantum metrology out of equilibrium

M.G.A. Paris
Ultimo
2019

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.
Complex systems; Ohmic reservoirs; Quantum probes
Settore FIS/03 - Fisica della Materia
1-lug-2019
Article (author)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/652340
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