The generalized partial transposition criterion for separability of multipartite quantum states

Abstract

We present a generalized partial transposition separability criterion for the density matrix of a multipartite quantum system. This criterion comprises as special cases the famous Peres-Horodecki criterion and the recent realignment criterion in [O. Rudolph, quant-ph/0202121] and [K. Chen, L.A. Wu, quant-ph/0205017]. It involves only straightforward matrix manipulations and is easy to apply. A quantitative measure of entanglement based on this criterion is also obtained.

6 pages, no figures, revtex4 style. Some misprints corrected, minor modificatins to some equations for clarity

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