Enhancement of squeezing effects in [formula omitted] -symmetric coupled microcavities

Abstract

We analyze theoretically the squeezing effects in parity-time symmetry coupled cavities, one is passive with optical Kerr medium and another one is active. The Heisenberg equations of motion for different field modes are solved analytically. Temporal variations of the variance of the field quadratures are studied for different photon tunneling strength, Kerr nonlinear strength and gain-to-loss ratio via single mode, compound mode, principal and normal squeezing. We also have done a numerical solution using the master equation for both single and compound mode. Squeezing effects are observed for single mode passive cavity field mode and passive-active cavity compound mode. Degree of squeezing parameter is controlled by photon tunneling strength between the cavities. The degree of squeezing is enhanced for passive-active cavity system as compared to passive-passive cavity system. The results may be useful for the generation of a low-noise signal via squeezed states and also suitable for optical communications.