We address the dynamics of nonclassicality for a quantum system interacting with a noisy fluctuating environment described by a classical stochastic field. As a paradigmatic example, we consider a harmonic oscillator initially prepared in a maximally nonclassical state, e.g., a Fock number state or a Schrödinger-cat-like state, and then coupled to either a resonant or a nonresonant external field. Stochastic modeling allows us to describe the decoherence dynamics without resorting to approximated quantum master equations and to introduce non-Markovian effects in a controlled way. A detailed comparison among different nonclassicality criteria and a thorough analysis of the decoherence time reveal a rich phenomenology whose main features may be summarized as follows: (i) Classical memory effects increase the survival time of quantum coherence and (ii) a detuning between the natural frequency of the system and the central frequency of the classical field induces revivals of quantum coherence.
Collapse and revival of quantum coherence for a harmonic oscillator interacting with a classical fluctuating environment / J. Trapani, M. Bina, S. Maniscalco, M.G.A. Paris. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - 91:2(2015 Feb 17), pp. 022113.1-022113.11.
|Titolo:||Collapse and revival of quantum coherence for a harmonic oscillator interacting with a classical fluctuating environment|
TRAPANI, JACOPO (Primo)
BINA, MATTEO (Secondo)
PARIS, MATTEO (Ultimo)
|Parole Chiave:||non-markovian dynamics; podolsky-rosen state; nonclassical states; observable criterion; systems; decoherence; nonlocality; information; semigroups; transition|
|Settore Scientifico Disciplinare:||Settore FIS/03 - Fisica della Materia|
|Data di pubblicazione:||17-feb-2015|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1103/PhysRevA.91.022113|
|Appare nelle tipologie:||01 - Articolo su periodico|