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Q: Fachverband Quantenoptik und Photonik

Q 11: Quantum Information: Atoms and Ions 1

Q 11.1: Vortrag

Montag, 14. März 2011, 14:30–15:00, BAR Schön

Remote Entanglement between a Single Atom and a Bose-Einstein Condensate — •Matthias Lettner, Martin Mücke, Stefan Riedl, Christoph Vo, Carolin Hahn, Simon Baur, Jörg Bochmann, Stephan Ritter, Stephan Dürr, and Gerhard Rempe — Max Planck-Institut für Quantenoptik, Hans Kopfermann Str.1, 85748 Garching

Entanglement has been recognised as a puzzling yet central element of quantum physics with applications envisioned in many fields like quantum computing and quantum networking. In the latter field photons will act as flying qubits for the entanglement of remote atomic systems. Here we report on the experimental demonstration of entanglement between a single atom located inside a high-finesse optical cavity and a Bose-Einstein condensate (BEC). To this end we generate a single photon in the atom-cavity system, entangling the photon polarisation with the atomic spin state. The photon is transported to a different laboratory, where it is stored in a BEC employing electromagnetically induced transparency (EIT). This converts the atom-photon entanglement into remote matter-matter entanglement. Subsequently we map the matter-matter entanglement onto photon-photon entanglement. The resulting two-photon state is found to have high fidelity with a maximally-entangled Bell state proving that entanglement survives all described mapping procedures. We determine the lifetime of the remote matter-matter entanglement and discuss decoherence mechanisms.