A Note on Resistance of NPT to Mixture of Separable States

الأصل · EN

We study the stability of NPT property of an arbitrary pure entangled state under the mixture of arbitrary pure separable states. For bipartite pure states with Schmidt number n (n>1) which is NPT, we show that this state is still NPT when it is mixed with no more than n(n-1)/2-1 arbitrary pure separable states. This result is generalized to multipartite case.