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Q: Fachverband Quantenoptik und Photonik
Q 15: Poster 1: Quanteninformation, Quanteneffekte, Laserentwicklung, Laseranwendungen, Ultrakurze Pulse, Photonik
Q 15.89: Poster
Monday, March 14, 2011, 16:30–19:30, P1
Atom-Photon Entanglement in Cavity QED with a Single Calcium Ion — •Bernardo Casabone1, Andreas Stute1, Birgit Brandstätter1, Diana Habicher1, Johannes Ghetta1, Andrew McClung1, Tracy Northup1, and Rainer Blatt1,2 — 1Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße 25/4, 6020 Innsbruck, Austria — 2Institut für Quantenoptik und Quanteninformation der Österreichischen Akademie der Wissenschaften, Otto-Hittmair-Platz 1, 6020 Innsbruck, Austria
A cavity QED system for atom-photon entanglement enables efficient collection of entangled photons; such a system could be used in a quantum network to remotely entangle atoms. Here, our progress toward entanglement in an optical cavity with a calcium ion is discussed.
A system consisting of a single trapped 40Ca+ ion coupled to the mode of a high-finesse optical resonator is used. Intra-cavity photons are generated in a vacuum-stimulated Raman process between two atomic states driven by a laser and the cavity vacuum field. We have previously implemented a single-photon source on the 4P1/2 ↔ 3D3/2 transition; we now generate single photons on the 4P3/2 ↔ 3D5/2 transition. All Zeeman states are resolved in agreement with theoretical simulations. A laser on the narrow 4S1/2 ↔ 3D5/2 transition permits detection of individual Zeeman states. Coherent state manipulation on this transition enables characterization of an entangled atom-photon state.
We discuss our ion-photon entanglement scheme, including simultaneously driving two vacuum-stimulated Raman transitions.