A problem of existence of bound entangled states with non-positive partial transpose and the Hilbert's 17th problem

Details A problem of existence of bound entangled states with non-positive partial transpose and the Hilbert's 17th problem A problem of existence of bound entangled states with non-positive partial transpose and the Hilbert's 17th problem

2010-07-12

arxiv.org/abs/1007.1830v1

Physics

Quantum Physics

9 pages, no figures

Scientific paper

It is found that the problem of existence of bound entangled states with non-positive partial transpose (NPPT) has the intriguing relation to the Hilbert's 17th problem. More precisely, we compute the expectation value of the partially transposed Werner states by Schmidt rank-2 vectors for NPPT and 1-copy undistillable region. It is the positive polynomial but shown not to be expressed as the sum of squares of polynomials. A remedy for such pathological behavior as well as a similar but different approach to the problem is also mentioned.

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