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Q: Fachverband Quantenoptik und Photonik

Q 25: Quanteninformation (Verschränkung und Dekohärenz II)

Q 25.1: Group Report

Tuesday, March 20, 2007, 14:00–14:30, 5L

Entanglement in Cavity-QED Systems — •Tatjana Wilk¹, Simon Webster¹, Gerhard Rempe¹, and Axel Kuhn² — ¹Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany — ²Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK

Creating entanglement between distant nodes of a quantum network is a major objective in quantum information processing. Realization of atom-photon entanglement is a big step towards this aim since photons can travel large distances without decoherence. In particular, entanglement swapping between photon pairs and distant atoms should be a feasible way to realize a quantum repeater. However, all atom-photon entanglement schemes that have been demonstrated so far [1] are plagued by low event rates and poor photon collection efficiencies. Therefore the anticipated entanglement swapping is hard to achieve. To overcome these limitations, atom-cavity systems could be used as photon emitters, since their overall efficiency is more than three orders of magnitude higher [2]. Here, we show a way to achieve entanglement in a strongly coupled atom-cavity system. The proposed scheme is well supported by first experimental results.

[1] Blinov et al., Nature 428, 153 (2004), Volz et al., Phys. Rev. Lett. 96, 30404 (2006).

[2] Kuhn et al., Phys. Rev. Lett. 89, 67901 (2002).