Quantifying quantumness of correlations using Gaussian Rényi-2 entropy in optomechanical interfaces

Using the Gaussian Rényi-2 entropy, we analyse the behaviour of two different aspects of quantum correlations (entanglement and quantum discord) in two optomechanical subsystems (optical and mechanical). We work in the resolved sideband and weak coupling regimes. In experimentally accessible paramet...

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Bibliographic Details
Published inJournal of modern optics Vol. 65; no. 13; pp. 1584 - 1594
Main Authors El Qars, J., Daoud, M., Ahl Laamara, R.
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis 29.07.2018
Taylor & Francis Ltd
Subjects
entanglement
Entropy
Freezing
Gaussian Rényi-2 entropy
optomechanical cavity
quantum discord
Quantum entanglement
Quantum phenomena
Quantum theory
quantumness of correlations
Temperature effects
Variation
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Summary:Using the Gaussian Rényi-2 entropy, we analyse the behaviour of two different aspects of quantum correlations (entanglement and quantum discord) in two optomechanical subsystems (optical and mechanical). We work in the resolved sideband and weak coupling regimes. In experimentally accessible parameters, we show that it is possible to create entanglement and quantum discord in the considered subsystems by quantum fluctuations transfer from either light to light or light to matter. We find that both mechanical and optical entanglement are strongly sensitive to thermal noises. In particular, we find that the mechanical one is more affected by thermal effects than that optical. Finally, we reveal that under thermal noises, the discord associated with the entangled state decays aggressively, whereas the discord of the separable state (quantumness of correlations) exhibits a freezing behaviour, seeming to be captured over a wide range of temperature.
ISSN:0950-0340
1362-3044
DOI:10.1080/09500340.2018.1455925