Quantum dynamics of an optomechanical system in the presence of photonic Bose-Einstein condensate

TL;DR

This paper theoretically investigates the interaction between a photonic Bose-Einstein condensate and a mechanical membrane, revealing how nonlinear photon interactions influence cooling, squeezing, entanglement, and spectral features in optomechanical systems.

Contribution

It introduces a model for strong linear coupling in a photon BEC optomechanical system, analyzing effects of nonlinearity and temperature on quantum phenomena.

Findings

Photon BEC enhances mechanical cooling and squeezing.

Nonlinearity reduces normal mode splitting and entanglement.

Temperature controls the strength of quantum effects.

Abstract

In this paper, we study theoretically the optomechanical interaction of an almost pure condensate of photons with an oscillating mechanical membrane in a micro-cavity. We show that in the Bogoliubov approximation, due to the large number of photons in the condensate phase, there is a linear strong effective coupling between the Bogoliubov mode of the photonic Bose-Einstein condensate (BEC) and the mechanical motion of the membrane which depends on the nonlinear photon-photon scattering potential. This coupling leads to the cooling of the mechanical motion, the normal mode splitting (NMS), the squeezing of the output field and the entanglement between the excited mode of the cavity and the mechanical mode. We show that, in one hand, the nonlinearity of the photon gas increases the degree of the squeezing of the output field of the micro-cavity and the efficiency of the cooling process at high temperatures. In the other hand, it reduces NMS in the displacement spectrum of the oscillating membrane and the degree of the optomechanical entanglement. In addition, the temperature of the photonic BEC can be used to control the above-mentioned phenomena.