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Abstract: It is found that the problem of existence of bound entangled states withnon-positive partial transpose NPPT has the intriguing relation to theHilbert-s 17th problem. More precisely, we compute the expectation value of thepartially transposed Werner states by Schmidt rank-2 vectors for NPPT and1-copy undistillable region. It is the positive polynomial but shown not to beexpressed as the sum of squares of polynomials. A remedy for such pathologicalbehavior as well as a similar but different approach to the problem is alsomentioned.



Autor: Tohya Hiroshima

Fuente: https://arxiv.org/







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