Concatenated beam splitters, optical feed-forward, and the nonlinear sign gate

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Kurt Jacobs and Jonathan P. Dowling
Quantum Science and Technologies Group, Hearne Institute for Theoretical Physics, Department of Physics and Astronomy, Louisiana State University, 202 Nicholson Hall, Tower Drive, Baton Rouge, Louisiana 70803, USA

Received 27 June 2006; revised 20 November 2006; published 26 December 2006

Weconsider a nonlinear sign gate implemented using a sequence oftwo beam splitters, and consider the use of further sequencesof beam splitters to implement feed-forward so as to correctan error resulting from the first beam splitter. We obtainsimilar results to Scheel et al. [Phys. Rev. A 73, 034301(2006)], in that we also find that our feed-forward procedureis only able to produce a very minor improvement inthe success probability of the original gate.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.74.064304
DOI:	10.1103/PhysRevA.74.064304
PACS:	03.67.Lx; 03.65.Ta; 89.70.+c; 02.50.Tt 03.67.Lx Quantum computation 03.65.Ta Foundations of quantum mechanics; measurement theory 89.70.+c Information theory and communication theory 02.50.Tt Inference methods YEAR: 2006
KEYWORDS:	optical beam splitters, feedforward, optical logic, nonlinear optics, quantum optics

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