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arXiv:quant-ph/0302070 · Physical Review Letters

Polarization Qubit Phase Gate in Driven Atomic Media

Carlo Ottaviani, David Vitali, M. Artoni, F. S. Cataliotti, Paolo Tombesi

Published May 15, 2003• 200 citations
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Abstract

We present here an all-optical scheme for the experimental realization of a quantum phase gate. It is based on the polarization degree of freedom of two traveling single-photon wave packets and exploits giant Kerr nonlinearities that can be attained in coherently driven ultracold atomic media.
DOI
10.1103/physrevlett.90.197902

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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.