Abstract

A nondegenerate optical parametric amplification (NOPA) system with N modes can be resolved into combinations of N degenerate parametric amplification (DOPA j, j=1N) systems. Based on the quantum fluctuations, we extend the method of V1 criterion for bipartite entanglement to multipartite entanglement. The entanglement characteristics for N=25 are investigated, the variance V1 decreases as a function of interaction time t, the great N brings a very small variance V1.

© 2011 Optical Society of America

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