Darmstadt 2008 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 29: Poster Quanteneffekte
Q 29.1: Poster
Tuesday, March 11, 2008, 16:30–19:00, Poster C2
A single photon source with a Ca+ cavity-QED system — •Andreas Stute1,2, Carlos Russo1,2, Helena G. Barros1,2, François Dubin1, Piet O. Schmidt1, and Rainer Blatt1,2 — 1Institut für Experimentalphysik, Universiät Innsbruck, Technikerstr. 25, A-6020 Innsbruck — 2Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Otto-Hittmair-Platz 1, A-6020 Innsbruck
Linear optics quantum computation as well as quantum cryptography require a source of single, indistinguishable photons. We realize a deterministic source of single photons in a setup consisting of a single trapped 40Ca+ ion coupled to a single mode of a high finesse optical resonator. A single trapped ion can be stored for days and can be precisely positioned in the cavity mode.
Photons are generated in a vacuum-stimulated Raman process driven by a pulsed pump laser and the cavity vacuum field. During the pump pulse a photon is emitted into the cavity mode, subsequently leaves the cavity and is detected with a Hanbury Brown & Twiss setup. The system is initialized again by repumping the ion back to the ground state and the sequence is repeated.
The resulting intensity correlation g(2)(τ) reveales the signature of a single photon source. The experimental results are in excellent agreement with numerical simulations of the process.