No-cloning of Orthogonal States in Composite Systems

Details No-cloning of Orthogonal States in Composite Systems No-cloning of Orthogonal States in Composite Systems

1998-02-12

arxiv.org/abs/quant-ph/9802036v1

Phys.Rev.Lett.80:3137-3140,1998

Physics

Quantum Physics

4 pages, RevTeX, to be published in PRL

Scientific paper

10.1103/PhysRevLett.80.3137

The no-cloning principle tells us that non-orthogonal quantum states cannot be cloned, but it does not tell us that orthogonal states can always be cloned. We suggest a situation where the cloning transformations are restricted, leading to a novel type of no-cloning principle. In the case of a composite system made of two subsystems: if the subsystems are only available one after the other then there are various cases when orthogonal states cannot be cloned. Surprising examples are given, which give a radically better insight regarding the basic concepts of quantum cryptography.

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