Fidelity criterion for quantum-domain transmission and storage of coherent states beyond unit-gain constraint
Quantum Physics
2008-09-29 v2
Abstract
We generalize the experimental success criterion for quantum teleportation/memory in continuous-variable quantum systems to be suitable for non-unit-gain condition by considering attenuation/amplification of the coherent-state amplitude. The new criterion can be used for a non-ideal quantum memory and long distance quantum communication as well as quantum devices with amplification process. It is also shown that the framework to measure the average fidelity is capable of detecting all Gaussian channels in quantum domain.
Keywords
Cite
@article{arxiv.quant-ph/0703158,
title = {Fidelity criterion for quantum-domain transmission and storage of coherent states beyond unit-gain constraint},
author = {Ryo Namiki and Masato Koashi and Nobuyuki Imoto},
journal= {arXiv preprint arXiv:quant-ph/0703158},
year = {2008}
}
Comments
4pages, No figures, Accepted for publication in PRL