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.File in questo prodotto:
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