A Proposal for an Optical Implementation of an Universal Quantum Phase Gate

Abstract

Large optical nonlinearities occurring in a coherently prepared atomic system are shown to produce phase shifts of order $\pi$. Such an effect may be observed in ultracold rubidium atoms where it could be feasibly exploited toward the realization of a polarization phase gate.

Foundations of Quantum Information, Camerino, 16th-19th April 2004, Italy