Nonlinear coupler and Bell-like states generation

Authors:

• Wiesław Leoński,
• Anna Kowalewska-Kudłaszyk

Abstract

We discuss a system of nonlinear coupler pumped linearly by an external, single-mode electromagnetic field. The coupler referred as to a nonlinear quantum scissor comprises two Kerr-like nonlinear oscillators coupled to each other through a nonlinear coupling. We show that for some values of the parameters describing the system, its evolution remains closed within a finite set of n-photon states corresponding to the two modes of the oscillators. As a consequence, the coupler discussed in the paper can behave as a qubitqutrit system. Moreover, we show that the system dynamics can lead to the generation of Bell-like states. © 2005 Akadémiai Kiadó, Budapest.