We propose a scheme for linear optical quantum Fredkin gate based on the combination of recently experimentally demonstrated linear optical partial SWAP gate and controlled-Z gates. Both heralded gate and simplified postselected gate operating in the coincidence basis are designed. The suggested setups have a simple structure and require stabilization of only a single Mach-Zehnder interferometer. A proof-of-principle experimental demonstration of the postselected Fredkin gate appears to be feasible and within the reach of current technology.
Cite
@article{arxiv.0809.3228,
title = {Linear optical Fredkin gate based on partial-SWAP gate},
author = {Jaromir Fiurasek},
journal= {arXiv preprint arXiv:0809.3228},
year = {2009}
}