Eur. Phys. J. D 46, 351-358 (2008)
https://doi.org/10.1140/epjd/e2007-00294-2

Two-mode squeezing in a coherently driven degenerate parametric down conversion

Physics Department, Addis Ababa University, P.O. Box, 1176 Addis Ababa, Ethiopia

Corresponding author: ^a sint_tesfa@yahoo.com

Received: 5 July 2007
Revised: 23 September 2007
Published online: 19 October 2007

Abstract

Squeezing properties of a two-mode radiation produced by a process of driven degenerate parametric down conversion, when the cavity is coupled to two independent squeezed vacuum reservoirs employing the linearization procedure, are analyzed. The two-mode cavity and output radiations exhibit considerable squeezing even when the oscillator is coupled to a vacuum reservoir. One of the effects of coupling the cavity to the squeezed vacuum reservoirs is to increase the degree of squeezing exponentially. For the output radiation the correlation of the quadrature operators evaluated at different times also contributes to the squeezing, which is the reason for quenching of the overall noise in one of the quadrature components of the fundamental mode.