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 Quantum nonlocality without entanglement in a pair of qubits


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We consider unambiguous discrimination of two separable bipartite states, one being pure and the other being a rank-2 mixed state. There is a gap between the optimal success probability under global measurements and the one achieved by generalized measurements with separable measurement operators. We show that even the latter success probability cannot be achieved via local operations and classical communication, leaving a nonzero gap in between.



Author: Masato Koashi; Fumitaka Takenaga; Takashi Yamamoto; Nobuyuki Imoto

Source: https://archive.org/



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