Experimental implementation of the optimal linear-optical controlled phase gate

0364431 - FZÚ 2012 RIV US eng J - Journal Article
Lemr, K. - Černoch, Antonín - Soubusta, Jan - Kieling, K. - Eisert, J. - Dušek, M.
Experimental implementation of the optimal linear-optical controlled phase gate.
Physical Review Letters. Roč. 106, č. 3 (2011), 013602/1-013602/4. ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA MŠMT(CZ) 1M06002
Institutional research plan: CEZ:AV0Z10100522
Keywords : optical implementations of quantum information processing and transfer * quantum computation
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 7.370, year: 2011

We report on the first experimental realization of optimal linear-optical controlled phase gates for arbitrary phases. The realized scheme is entirely flexible in that the phase shift can be tuned to any given value. All such controlled phase gates are optimal in the sense that they operate at the maximum possible success probabilities that are achievable within the framework of postselected linear-optical implementations with vacuum ancillas. The quantum gate is implemented by using bulk optical elements and polarization encoding of qubit states. We have experimentally explored the remarkable observation that the optimum success probability is not monotone in the phase.
Permanent Link: http://hdl.handle.net/11104/0199918