Physics – Quantum Physics
Scientific paper
2004-12-28
Int.J.Quant.Inf. 3 (2005) 611-621
Physics
Quantum Physics
10 pages, 2 eps figures. Submitted to International Journal of Quantum Information
Scientific paper
Recently, it was shown that fundamental gates for theoretically efficient quantum information processing can be realized by using single photon sources, linear optics and quantum counters. One of these fundamental gates is the NS-gate, that is, the one-mode non-linear sign shift. In this work, firstly, we prove by a new rigorous proof that the upper bound of success probability of NS-gates with only one helper photon and an undefined number of ancillary modes is bounded by 0.25. Secondly, we explore the upper bound of success probability of NS-gate with a new post-selection measurement. The idea behind this new post-selection measurement is to condition the success of NS-gate transformation to the observation of only one helper photon in whichever of the output modes.
Aniello Paolo
Cagli Coen R.
Cesario N.
Foncellino F.
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