Deviations from reversible dynamics in a qubit–oscillator system coupled to a very small environment

A. Vidiella-Barranco

Physica A: Statistical Mechanics and its Applications, 2014, vol. 402, issue C, 209-215

Abstract: In this contribution it is considered a simple and solvable model consisting of a qubit in interaction with an oscillator exposed to a very small “environment” (a second qubit). An isolated qubit–oscillator system having the oscillator initially in one of its energy eigenstates exhibits Rabi oscillations, an evidence of coherent quantum behaviour. It is shown here in which way the coupling to a small “environment” disrupts such regular behaviour, leading to a quasi-periodic dynamics for the qubit linear entropy. In particular, it is found that the linear entropy is very sensitive to the amount of mixedness of the “environment”. For completeness, fluctuations in the oscillator energy are also taken into account.

Keywords: Quantum optics; Cavity QED; Tavis–Cummings model; Entropy (search for similar items in EconPapers)
Date: 2014
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:402:y:2014:i:c:p:209-215

DOI: 10.1016/j.physa.2014.02.004

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