No-cloning of Orthogonal States in Composite Systems
Quantum Physics
2009-01-23 v1
Abstract
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.
Keywords
Cite
@article{arxiv.quant-ph/9802036,
title = {No-cloning of Orthogonal States in Composite Systems},
author = {Tal Mor},
journal= {arXiv preprint arXiv:quant-ph/9802036},
year = {2009}
}
Comments
4 pages, RevTeX, to be published in PRL