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Let us also recall that, while entangled states with positive partial transposition do exist (even in the Gaussian setting, see Ref. 3), their entanglement turns out to be bound, i.e., not distillable.
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Such states draw their names by their expression in the quadrature basis in the limit of infinite squeezing that reads, up to normalization, ∫ x,...,x〉dx, where x,...,x) stands for the simultaneous eigenvector of the n position operators with equal eigenvalue x.
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