Enhanced continuous generation of non-Gaussianity through optomechanical modulation. (29th May 2019)

• Record Type: Journal Article
• Authors: Qvarfort, Sofia; Serafini, Alessio; Xuereb, André; Rätzel, Dennis; Bruschi, David Edward
• Is Part Of: New journal of physics. Volume 21:Number 5(2019:May)
• Publication Date: 2019-05-29
• Subjects: optomechanics -- non-Gaussian -- nonlinearity -- modulated optomechanics; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/ab1b9e
• Languages: English
• ISSNs: 1367-2630

Abstract

Abstract: We study the non-Gaussian character of quantum optomechanical systems evolving under the fully nonlinear optomechanical Hamiltonian. By using a measure of non-Gaussianity based on the relative entropy of an initially Gaussian state, we quantify the amount of non-Gaussianity induced by both a constant and time-dependent cubic light–matter coupling and study its general and asymptotic behaviour. We find analytical approximate expressions for the measure of non-Gaussianity and show that initial thermal phonon occupation of the mechanical element does not significantly impact the non-Gaussianity. More importantly, we also show that it is possible to continuously increase the amount of non-Gassuianity of the state by driving the light–matter coupling at the frequency of mechanical resonance, suggesting a viable mechanism for increasing the non-Gaussianity of optomechanical systems even in the presence of noise.