Information-Disturbance Tradeoff in Quantum State Discrimination
Quantum Physics
2007-05-23 v2
Abstract
When discriminating between two pure quantum states, there exists a quantitative tradeoff between the information retrieved by the measurement and the disturbance caused on the unknown state. We derive the optimal tradeoff and provide the corresponding quantum measurement. Such an optimal measurement smoothly interpolates between the two limiting cases of maximal information extraction and no measurement at all.
Cite
@article{arxiv.quant-ph/0610196,
title = {Information-Disturbance Tradeoff in Quantum State Discrimination},
author = {Francesco Buscemi and Massimiliano F. Sacchi},
journal= {arXiv preprint arXiv:quant-ph/0610196},
year = {2007}
}
Comments
5 pages, 2 (low-quality) figures. Eq. (20) corrected. Final published version