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Q: Fachverband Quantenoptik und Photonik
Q 2: Quanteninformation (Atome und Ionen I)
Q 2.7: Talk
Monday, March 10, 2008, 15:45–16:00, 1B
Long-distance atom-photon entanglement and its coherence properties — •Michael Krug1, Wenjamin Rosenfeld1, Fred Hocke1, Florian Henkel1, Andreas Deeg1, Christian Jakob1, Markus Weber1, and Harald Weinfurter1,2 — 1Sektion Physik, Ludwig-Maximilians-Universität München, Schellingstrasse 4, D-80799 München — 2Max-Planck Institut für Quantenoptik, D-85748 Garching
Long-distance Atom-Photon Entanglement: The distribution of entanglement between quantum memories at remote locations is one major challenge for the first demonstration of a quantum repeater. Entanglement between matter and light [1] is crucial for achieving this task. Here we report the observation of entanglement between a single trapped atom and a single photon, separated 300 m via an optical fiber. The entanglement is verified by appropriate correlation measurements of the atom-photon pair after communicating the photon through the fiber. In addition we analyzed the temporal evolution of the atomic density matrix after projecting the atom-photon pair via a state measurement of the photon onto a well defined atomic spin state. We find that the atomic Zeeman qubit decoheres after 100 µs. Our results represent important steps towards the realization of entanglement between single neutral atoms at distances of several 100 m.
[1] J. Volz, M. Weber, D. Schlenk et al., Phys. Rev. Lett. 96, 030404 (2006).