Physics – Quantum Physics
Scientific paper
2005-09-10
Phys. Rev. A 73, 034301 (2006)
Physics
Quantum Physics
4 pages, 3 eps figures, typeset using RevTex4, problems with figures resolved
Scientific paper
10.1103/PhysRevA.73.034301
Nonlinear optical quantum gates can be created probabilistically using only single photon sources, linear optical elements and photon-number resolving detectors. These gates are heralded but operate with probabilities much less than one. There is currently a large gap between the performance of the known circuits and the established upper bounds on their success probabilities. One possibility for increasing the probability of success of such gates is feed-forward, where one attempts to correct certain failure events that occurred in the gate's operation. In this brief report we examine the role of feed-forward in improving the success probability. In particular, for the non-linear sign shift gate, we find that in a three-mode implementation with a single round of feed-forward the optimal average probability of success is approximately given by p= 0.272. This value is only slightly larger than the general optimal success probability without feed-forward, P= 0.25.
Eisert Jens
Kok Pieter
Munro William J.
Nemoto Keiichi
Scheel Stefan
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