TRANSFER OF NONCLASSICAL PROPERTIES IN DUAL-CHANNEL DIRECTIONAL COUPLER

Quantum uncertainties of the quadratures and the photon statistics are analyzed in the coupling interaction between two modes of radiation v ia a dual channel directional coupler. The motivation of this work is to control the quantum properties of one light beam by another. Under the rotating wave approximation we show that if one of the modes is co herent (classical) and the other one squeezed, then the squeezing and non-Poissonianness of the photon statistics can be induced in the cohe rent mode. It is also shown that the transferred squeezing and non-cla ssical number statistics in the second mode is of a new type. In the a ffected mode the squeezed quadrature remains squeezed, whereas the oth er quadrature is anti-squeezed, throughout except at the times where b oth of them return to a coherent value. The photon number of the affec ted mode shows both sub-Poissonian and super-Poissonian statistics as time evolves. (C) 1997 Elsevier Science B.V.