Minimal disturbance measurement for coherent states is non-Gaussian
Abstract
In standard coherent state teleportation with shared two-mode squeezed vacuum (TMSV) state there is a trade-off between the teleportation fidelity and the fidelity of estimation of the teleported state from results of the Bell measurement. Within the class of Gaussian operations this trade-off is optimal, i.e. there is not a Gaussian operation which would give for a given output fidelity a larger estimation fidelity. We show that this trade-off can be improved by up to 2.77% if we use a suitable non-Gaussian operation. This operation can be implemented by the standard teleportation protocol in which the shared TMSV state is replaced with a suitable non-Gaussian entangled state. We also demonstrate that this operation can be used to enhance the transmission fidelity of a certain noisy channel.
Keywords
Cite
@article{arxiv.quant-ph/0510191,
title = {Minimal disturbance measurement for coherent states is non-Gaussian},
author = {Ladislav Mišta},
journal= {arXiv preprint arXiv:quant-ph/0510191},
year = {2009}
}
Comments
submitted to Physical Review A, new results added, 7 pages, 4 figures