No-cloning of Orthogonal States in Composite Systems

Preprint

12 February 1998

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.quant-ph/9802036

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

NO CLONING PRINCIPLE
ORTHOGONAL STATES
COMPOSITE SYSTEM
PRINCIPLE TELLS
CRYPTOGRAPHY
TELL US

All Related Versions

Version 1, 1998-02-12, ArXiv
Published version: Physical Review Letters, 80 (14), 3137.

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