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International Journal of Quantum Information

A PROPOSAL FOR AN OPTICAL IMPLEMENTATION OF A UNIVERSAL QUANTUM PHASE GATE

S. Rebić, David Vitali, Carlo Ottaviani, P. Tombesi, M. Artoni, F. S. Cataliotti, R. Corbalán

Published Dec 17, 2004• 0 citations
Publisher

Abstract

Large optical nonlinearities occurring in a coherently prepared atomic system are shown to produce phase shifts of order π. Such an effect may be observed in ultracold rubidium atoms where it could be feasibly exploited toward the realization of a polarization phase gate.
DOI
10.1142/s0219749905000827

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Large optical nonlinearities occurring in a coherently prepared atomic system are shown to produce phase shifts of order πππ. Such an effect may be observed in ultracold rubidium atoms where it could be feasibly exploited toward the realization of a polarization phase gate.
We analyze the nonlinear optical response of a four-level atomic system driven into a tripod configuration. The large cross-Kerr nonlinearities that occur in such a system are shown to produce nonlinear phase shifts of order $\ensuremath{\pi}$. Such a substantial shift may be observed in a cold atomic gas in a magneto-optical trap where it could be feasibly exploited towards the realization of a polarization quantum phase gate. The experimental feasibility of such a gate is here examined in detail.