It has been conjectured that the entangled output state from a beam splitter requires nonclassicality in the input state [M. S. Kim, W. Son, V. Buzek, and P. L. Knight, Phys. Rev. A 65, 032323 (2002)]. Here we give a proof for this conjecture.
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Xiang‐Bin Wang (2002) studied this question.
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