Effects of laser phase noise on optomechanical entanglement in the presence of a nonlinear Kerr downconverter

In this paper, we consider an optomechanical system with a Kerr downconversion element in the presence of pump laser phase noise (LPN). In particular, we study the effect of phase fluctuations on entanglement generation in the presence of a nonlinear Kerr downconverter. The steady-state entanglement spectrum depends upon the parametric gain and phase fluctuations associated with the driving field. Interestingly, our results show that optomechanical entanglement exists even for non-zero LPN. It has been shown that the presence of Kerr downconverter nonlinearity improves the robustness of the entanglement against the input LPN.