Quantum metrology out of equilibrium
Quantum Physics
2019-05-14 v2
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
Cite
@article{arxiv.1808.07180,
title = {Quantum metrology out of equilibrium},
author = {Sholeh Razavian and Matteo G. A. Paris},
journal= {arXiv preprint arXiv:1808.07180},
year = {2019}
}