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Q: Fachverband Quantenoptik und Photonik
Q 18: Quanteninformation: Photonen I
Q 18.7: Vortrag
Dienstag, 3. März 2009, 12:00–12:15, VMP 6 HS-D
Ion-trap single-photon source for quantum networks — •Helena G. Barros1,2, Andreas Stute1,2, Tracy Northup1, Carlos Russo1, Piet O. Schmidt1, and Rainer Blatt1,2 — 1Institut für Experimentalphysik, Universität Innsbruck, Technikerstr. 25, A-6020 Innsbruck — 2Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Otto-Hittmair-Platz 1, A-6020 Innsbruck
A deterministic source of single photons represents both a fundamentally nonclassical device and a resource for quantum information protocols. In the setting of cavity QED, the coherent generation of single photons provides an atom-photon interface, the basis for quantum networks. Such an interface could be used to realize atom-photon entanglement or entanglement between distant trapped atoms.
We demonstrate and characterize a single-photon source in a new ion-trap cavity-QED experiment in which a single trapped 40Ca+ ion is coupled to the mode of a high-finesse optical cavity. After preparation of the atom in a single Zeeman state, a vacuum-stimulated Raman process transfers the atom to a second Zeeman state, generating one photon in the cavity mode. We evaluate the photon statistics of the source by measurements of the second-order correlation function g(2)(τ). Furthermore, the temporal profile of the photon exiting the cavity allows us to investigate the dynamics of the Raman transfer. We find strong quantitative agreement with numerical simulations and are thus able to evaluate the coherence of the process.