Abstract

Two pairs of EPR beams with identical frequency and constant phase relation are composed on two beamsplitters to produce two pairs of conditional entangled bcams, two halves of which are sent to two sending stations (Alices) and others to two recciving stations (Bobs). The EPR entnagled beams initially result from two-mode quadrature squeezed state light produced by, for example, two nondegenerate optical parametric oscillators (NOPO) pumped by a same laser. Converting the squeezed component of one of the EPR sources between amplitude and phase, the input quantum state at a sender will be reproduced at two receivers in turn. The quantum switching performance between two receivers is only manipulated by the squeezed component of a two-mode squeezed state light, which can be experimentally demonstrated by controlling the parametric process either in amplification or deamplification.

© 2001 Optical Society of America