Data di Pubblicazione:
2018
Citazione:
Continuous-variable quantum probes for structured environments / M. Bina, F. Grasselli, M.G.A. Paris. - In: PHYSICAL REVIEW A. - ISSN 2469-9926. - 97:1(2018), pp. 012125.1-012125.12.
Abstract:
We address parameter estimation for structured environments and suggest an effective estimation scheme based on continuous-variables quantum probes. In particular, we investigate the use of a single bosonic mode as a probe forOhmic reservoirs, and obtain the ultimate quantum limits to the precise estimation of their cutoff frequency. We assume the probe prepared in a Gaussian state and determine the optimal working regime, i.e., the conditions for the maximization of the quantum Fisher information in terms of the initial preparation, the reservoir temperature, and the interaction time. Upon investigating the Fisher information of feasible measurements, we arrive at a remarkable simple result: homodyne detection of canonical variables allows one to achieve the ultimate quantum limit to precision under suitable, mild, conditions. Finally, upon exploiting a perturbative approach, we find the invariant sweet spots of the (tunable) characteristic frequency of the probe, able to drive the probe towards the optimal working regime.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Dynamical semigroups; brownian-motion; systems; discrimination; decohrence; states; noise
Elenco autori:
M. Bina, F. Grasselli, M.G.A. Paris
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