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Q: Fachverband Quantenoptik und Photonik
Q 2: Quanteninformation: Atome und Ionen I
Q 2.4: Vortrag
Montag, 2. März 2009, 11:30–11:45, ESA-B
Photon-Photon Entanglement with an Atom-Cavity System — •Martin Mücke, Bernhard Weber, Holger Specht, Tobias Müller, Joerg Bochmann, David Moehring, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany
We report on the implementation of a deterministic protocol where a single rubidium atom trapped within a high-finesse optical cavity is entangled with an emitted photon [1]. After a chosen time, the atomic state is mapped onto a second photon, thus generating an entangled photon pair. Compared to previous experiments with falling atoms [2], the long trapping times of exactly one atom in the mode of the cavity allow for ∼ 105 times more entangled photons per atom and also for a measurement of the coherence time of the atomic qubit. The entanglement is verified by a Bell inequality measurement that is in clear violation of classical physics. Furthermore, the two-photon state is characterized via quantum state tomography.
[1] B. Weber et al., accepted by PRL, arXiv:0811.3612v1
[2] T. Wilk et al., Science 317, 488 (2007)