Year: 2006
Type: article
Abstract: 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 1. 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 nonlinear 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 ${p}_{\mathrm{success}}=0.272$. This value is only slightly larger than the general optimal success probability without feed-forward, ${p}_{\mathrm{success}}=0.25$.
Source: Physical Review A
Authors: S. Scheel, W. J. Munro, J. Eisert, K. Nemoto, P. Kok
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2164320138