Abstract

A nondegenerate optical parametric amplification (NOPA) system with N modes can be resolved into combinations of N degenerate parametric amplification (DOPA j, $j=1–N$) systems. Based on the quantum fluctuations, we extend the method of $V_1$ criterion for bipartite entanglement to multipartite entanglement. The entanglement characteristics for $N=2–5$ are investigated, the variance $V_1$ decreases as a function of interaction time t, the great N brings a very small variance $V_1$.

© 2011 Optical Society of America

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