Instruments and channels in quantum information theory
量子物理
2009-11-10 v1
摘要
While a positive operator valued measure gives the probabilities in a quantum measurement, an instrument gives both the probabilities and the a posteriori states. By interpreting the instrument as a quantum channel and by using the typical inequalities for the quantum and classical relative entropies, many bounds on the classical information extracted in a quantum measurement, of the type of Holevo's bound, are obtained in a unified manner.
引用
@article{arxiv.quant-ph/0409019,
title = {Instruments and channels in quantum information theory},
author = {Alberto Barchielli and Giancarlo Lupieri},
journal= {arXiv preprint arXiv:quant-ph/0409019},
year = {2009}
}
备注
12 pages, revtex4