Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 23: Poster 2: Intersectional Session

Q 23.37: Poster

Dienstag, 15. März 2011, 18:00–21:00, P1

Entangled photons at 780 nm and 795 nm from a single atom — •Joerg Bochmann, Martin Mücke, Carolin Hahn, Andreas Neuzner, Stephan Ritter, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching

Neutral atoms embedded in high-finesse optical cavities are well suited for applications in quantum information science. A prime example is entanglement of a single intra-cavity atom with a single emitted photon by means of a deterministic scheme [1]: A vacuum stimulated Raman adiabatic passage generates a photon whose polarization is entangled with the atomic spin state. After a chosen delay time, the atomic state can be mapped onto the polarization state of a second emitted photon. Crucial for applications of this scheme in quantum network experiments are achievable success rates, fidelities and coherence times.

Here, we report on significant improvements of these key parameters in our experiment and compare its performance on the D1 (795 nm) and D2 (780 nm) lines of Rubidium. We show that the fidelity with the desired Bell state is markedly increased when using the D1 line. Moreover, we are able to extend the coherence time of the atomic qubit by more than an order of magnitude, beyond 100 us. Further optimization strategies will be discussed.

[1] B. Weber et al., Phys. Rev. Lett. 102, 100 (2009).