Explicit product ensembles for separable quantum states

Details Explicit product ensembles for separable quantum states Explicit product ensembles for separable quantum states

1999-04-30

arxiv.org/abs/quant-ph/9904109v2

J.Mod.Opt. 47 (2000) 387-399

Physics

Quantum Physics

15 pages, no figures

Scientific paper

We present a general method for constructing pure-product-state representations for density operators of $N$ quantum bits. If such a representation has nonnegative expansion coefficients, it provides an explicit separable ensemble for the density operator. We derive the condition for separability of a mixture of the Greenberger-Horne-Zeilinger state with the maximally mixed state.

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