2018/12/31 by Sofia Qvarfort, Alessio Serafini, André Xuereb +2
Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Coupling (piping) #Coupling constant #Gaussian #Measure (data warehouse) #Mechanical and Optical Resonators #Nonlinear system #Phonon #Quantum #Thermal #quant-ph #stochastic dynamics and bifurcation
paper · pdf · doi:10.1088/1367-2630/ab1b9e
published as New J. Phys. 21 055004 (2019) · 37 pages, 17 figures. New Journal of Physics (2019)
openalex publication_date 2019/04/23 · arxiv created 2020/03/25 · arxiv updated 2020/03/26 · openalex created_date 2020/04/03 · openalex updated_date 2026/08/06
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.