Characteristic entanglement timescales of a qubit coupled to a quartic oscillator

The structure of the entanglement dynamics of a qubit coupled to a quartic oscillator is investigated through the calculation of timescales of visibility and predictability, and their relation with the concurrence dynamics. This model can describe a Rydberg atom in a Kerr medium. A method based on t...

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Bibliographic Details
Published in:Physics letters. A 2016-02, Vol.380 (4), p.554-561
Main Authors: Bosco de Magalhães, A.R., Oliveira, Adélcio C.
Format: Article
Language:English
Subjects:
Characteristic timescales
Decomposition
Dynamic structural analysis
Dynamics
Entanglement dynamics
Joining
Mathematical models
Nonlinear oscillator
Oscillators
Quantum information
Qubits (quantum computing)
Time
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Summary:The structure of the entanglement dynamics of a qubit coupled to a quartic oscillator is investigated through the calculation of timescales of visibility and predictability, and their relation with the concurrence dynamics. This model can describe a Rydberg atom in a Kerr medium. A method based on the analysis of the different interference processes of the terms that compose the physical quantities studied is proposed, and timescales related to decay, revivals and fast oscillations under the decay envelope are computed. The method showed to be effective for the vast majority of cases studied, even when the timescales vary several orders of magnitude. The conditions for expansions in power series to give correct decay timescales are analyzed. •A method for the calculation of different timescales is proposed.•It focuses on the interference of the terms that form the quantity of interest.•Entanglement timescales of a quartic oscillator coupled to a qubit are investigated.•This system can be used to model a Rydberg atom in a Kerr medium.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2015.11.034