Hamburg 2009 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 30: Poster II
Q 30.39: Poster
Dienstag, 3. März 2009, 16:30–19:00, VMP 9 Poster
Entanglement distribution between a trapped atom and two photons — •Stephan Ritter, Bernhard Weber, Holger P. Specht, Tobias Müller, Jörg Bochmann, Martin Mücke, David L. Moehring, and Gerhard Rempe — Max-Planck-Institut fü Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany
While atoms make an excellent qubit for the storage of quantum states, photons are naturally well suited for the distribution of quantum information. Therefore efficient atom-photon interfaces are an important prerequisite for distributed quantum computing networks.
Here, we report on the implementation of a deterministic entanglement protocol. In a first step, entanglement between a single atom trapped within a high-finesse optical cavity and an emitted photon is created. Subsequently, the atomic quantum state is mapped onto a second photon, allowing for photon-photon entanglement. The entanglement has been verified using both a Bell inequality measurement and full quantum-state tomography [1].
Trapping of the atom within the cavity mode and repeated cooling stages result in an increase in the number of atom-photon entanglement events per atom by a factor of 105 compared to previous experiments [2]. In addition, the presence of exactly one atom in the cavity can be detected with greater than 99 % fidelity.
[1] B. Weber et al., arXiv:0811.3612 (2008).
[2] T. Wilk et al., Science 317, 488 (2007).