Phys. Rev. A 74, 064304 (2006) [4 pages]Concatenated beam splitters, optical feed-forward, and the nonlinear sign gateReceived 27 June 2006; revised 20 November 2006; published 26 December 2006 We consider a nonlinear sign gate implemented using a sequence of two beam splitters, and consider the use of further sequences of beam splitters to implement feed-forward so as to correct an error resulting from the first beam splitter. We obtain similar results to Scheel et al. Phys. Rev. A 73 034301 (2006), in that we also find that our feed-forward procedure is only able to produce a very minor improvement in the success probability of the original gate. © 2006 The American Physical Society 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
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