We address extended systems interacting with classical fluctuating environments and analyze the use of quantum probes to discriminate local noise, described by independent fluctuating fields, from common noise, corresponding to the interaction with a common one. In particular, we consider a bipartite system made of two non-interacting harmonic oscillators and assess discrimination strategies based on homodyne detection, comparing their performances with the ultimate bounds on the error probabilities of quantum-limited measurements. We analyze in details the use of Gaussian probes, with emphasis on experimentally friendly signals. Our results show that a joint measurement of the position-quadrature on the two oscillators outperforms any other homodyne-based scheme for any input Gaussian state.
Entanglement as a resource for discrimination of classical environments / J. Trapani, M.G.A. Paris. - In: PHYSICS LETTERS A. - ISSN 0375-9601. - 381:4(2017), pp. 245-251.
|Titolo:||Entanglement as a resource for discrimination of classical environments|
TRAPANI, JACOPO (Primo)
PARIS, MATTEO (Secondo)
|Parole Chiave:||Gaussian states and operations; Open quantum systems; Quantum discrimination; Physics and Astronomy (all)|
|Settore Scientifico Disciplinare:||Settore FIS/03 - Fisica della Materia|
|Progetto:||Quantum Probes for Complex Systems|
|Data di pubblicazione:||2017|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.physleta.2016.11.027|
|Appare nelle tipologie:||01 - Articolo su periodico|