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Ultrafast Coherent Coupling of Atomic Hyperfine and Photon Frequency Qubits

M. J. Madsen, D. L. Moehring, P. Maunz, R. N. Kohn, L. -M. Duan, C. Monroe

quant-pharXiv:quant-ph/0603258

Abstract

We demonstrate ultrafast coherent coupling between an atomic qubit stored in a single trapped cadmium ion and a photonic qubit represented by two resolved frequencies of a photon. Such ultrafast coupling is crucial for entangling networks of remotely-located trapped ions through photon interference, and is also a key component for realizing ultrafast quantum gates between Coulomb-coupled ions.

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