Influence of Squeezed Vacuum on Bistable Behavior

Zhaoyang Chen, Chunguang Du, Shangqing Gong +1 more

Saad S. M. Hassan, Yasser Amoun Sharaby

Steven F. Haas, Murray Sargent

Craig M. Savage, Daniel F. Walls

János A. Bergou, D. Zhao

We discuss the optical bistable behavior of a system of N two-level atoms pumped by a coherent input field and coupled to a squeezed vacuum field by treating the optical bistability of such a system as an input-output problem. We consider the equation of motion for atomic dipole moments, coupled to the cavity field and the squeezed vacuum, and the boundary condition connecting the input and output fields with the atomic lowering operator. A simple analytical expression for the influence of the squeezed vacuum input on the bistable behavior of the output field is derived by this method. The results indicate a strong influence of the squeezed vacuum input on optical bistability. The squeezed (stretched) vacuum input field tends to increase (decrease) the range of optical bistability.

Chunguang Du, Zhaoyang Chen, Jingtao Zhang +1 more

The effect of squeezed vacuum input on the optical bistable behavior of a system of N three-level atoms which are simultaneously coupled to a coherent pump field and a squeezed vacuum input is investigated. It is shown that the squeezed vacuum will significantly increase the range of the optical bistability, and the bistability can be controlled by the squeezing photon number and the strength of two-photon correlation.