Spin chain model for correlated quantum channels
Quantum Physics
2008-11-26 v1 Other Condensed Matter
Abstract
We analyze the quality of the quantum information transmission along a correlated quantum channel by studying the average fidelity between input and output states and the average output purity, giving bounds for the entropy of the channel. Noise correlations in the channel are modeled by the coupling of each channel use with an element of a one dimensional interacting quantum spin chain. Criticality of the environment chain is seen to emerge in the changes of the fidelity and of the purity.
Cite
@article{arxiv.0805.4277,
title = {Spin chain model for correlated quantum channels},
author = {Davide Rossini and Vittorio Giovannetti and Simone Montangero},
journal= {arXiv preprint arXiv:0805.4277},
year = {2008}
}
Comments
15 pages, 8 figures