Entangling efficiency of linear-optical quantum gates

0387506 - FZÚ 2013 RIV US eng J - Journal Article
Lemr, Karel - Černoch, Antonín - Soubusta, Jan - Dušek, M.
Entangling efficiency of linear-optical quantum gates.
Physical Review. A. Roč. 86, č. 3 (2012), "032321-1"-"032321-5". ISSN 1050-2947
R&D Projects: GA ČR GAP205/12/0382
Institutional research plan: CEZ:AV0Z10100522
Keywords : linear-optical quantum gates * quantum physics
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 3.042, year: 2012
http://pra.aps.org/pdf/PRA/v86/i3/e032321

We propose a measure of the nonclassicality of quantum gates which is particularly suitable for probabilistic devices. This measure enables to compare deterministic devices which prepare entangled states with a low amount of entanglement with probabilistic devices which generate highly entangled states but which fail sometimes. We provide examples demonstrating the advantages of this measure over the so-far employed entangling power. The experimentally determined entangling efficiency of a tunable linear-optical controlled-phase gate is presented to highlight the practical aspects of this measure.
Permanent Link: http://hdl.handle.net/11104/0216588