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Abstract: We consider unambiguous discrimination of two separable bipartite states, onebeing pure and the other being a rank-2 mixed state. There is a gap between theoptimal success probability under global measurements and the one achieved bygeneralized measurements with separable measurement operators. We show thateven the latter success probability cannot be achieved via local operations andclassical communication, leaving a nonzero gap in between.



Autor: Masato Koashi, Fumitaka Takenaga, Takashi Yamamoto, Nobuyuki Imoto

Fuente: https://arxiv.org/







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