Universal and original-preserving quantum copying is impossible

Publication Type:
Journal Article
Citation:
Physics Letters, Section A: General, Atomic and Solid State Physics, 2002, 297 (1-2), pp. 1 - 3
Issue Date:
2002-05-06
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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 with factor 1/2, which involves no information of the original state. © 2002 Elsevier Science B.V. All rights reserved.
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