A1 Journal article – refereed
Collapse and revival of quantum coherence for a harmonic oscillator interacting with a classical fluctuating environment




List of Authors: Jacopo Trapani, Matteo Bina, Sabrina Maniscalco, Matteo G. A. Paris
Publisher: AMER PHYSICAL SOC
Publication year: 2015
Journal: Physical Review A
Journal name in source: PHYSICAL REVIEW A
Journal acronym: PHYS REV A
Volume number: 91
ISSN: 1050-2947

Abstract


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 Schrodinger-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.



Last updated on 2019-29-01 at 22:03