Fidelity of Gaussian channels
Quantum Physics
2007-05-23 v1
Abstract
A noisy Gaussian channel is defined as a channel in which an input field mode is subjected to random Gaussian displacements in phase space. We introduce the quantum fidelity of a Gaussian channel for pure and mixed input states, and we derive a universal scaling law of the fidelity for pure initial states. We also find the maximum fidelity of a Gaussian channel over all input states. Quantum cloning and continuous-variable teleportation are presented as physical examples of Gaussian channels to which the fidelity results can be applied.
Cite
@article{arxiv.quant-ph/0409063,
title = {Fidelity of Gaussian channels},
author = {Carlton M. Caves and Krzysztof Wodkiewicz},
journal= {arXiv preprint arXiv:quant-ph/0409063},
year = {2007}
}
Comments
Based on invited talk given by KW at XXXVI Symposium on Mathematical Physics, "Open Systems and Quantum Information," Torun, Poland, June 9-12, 2004. To be published in Open Systems and Information Dynamics