Universal And Original-Preserving Quantum Copying Is Impossible

Elsevier Science Bv
Publication Type:
Journal Article
Physics Letters A, 2002, 297 (1-Feb), pp. 1 - 3
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We show that an arbitrary quantum state cannot be universally 1 --> 2 copied keeping the original copy unchanged. Indeed, the density operator of the additional copy after the copying transformation is nothing but the scale product of the identity matrix
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