Quantum State Disturbance vs. Information Gain: Uncertainty Relations for Quantum Information
Quantum Physics
2009-10-28 v1
Abstract
When an observer wants to identify a quantum state, which is known to be one of a given set of non-orthogonal states, the act of observation causes a disturbance to that state. We investigate the tradeoff between the information gain and that disturbance. This issue has important applications in quantum cryptography. The optimal detection method, for a given tolerated disturbance, is explicitly found in the case of two equiprobable non-orthogonal pure states.
Cite
@article{arxiv.quant-ph/9512023,
title = {Quantum State Disturbance vs. Information Gain: Uncertainty Relations for Quantum Information},
author = {Christopher A. Fuchs and Asher Peres},
journal= {arXiv preprint arXiv:quant-ph/9512023},
year = {2009}
}
Comments
20 pages, standard LaTeX, four png figures (also available from the authors: peres@photon.technion.ac.il and cfuchs@tangelo.phys.unm.edu)