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Q: Fachverband Quantenoptik und Photonik
Q 48: Quanteninformation: Quantenkommunikation I
Q 48.5: Talk
Thursday, March 5, 2009, 15:00–15:15, Audi-B
Towards long-distance atom-photon and atom-atom entanglement — •Michael Krug1, Florian Henkel1, Norbert Ortegel1, Julian Hofmann1, Wenjamin Rosenfeld1, Markus Weber1, and Harald Weinfurter1,2 — 1Department für Physik der LMU, Schellingstraße 4/III, 80799 München — 2Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching
Entanglement between single neutral atoms separated by several hundred meters is an essential step towards future applications in long-distance quantum communication like the quantum repeater and a first loophole-free test of Bell’s inequality [1]. Atom-photon entanglement is the key element to realize both goals. By swapping the entanglement from two non-interacting entangled atom-photon pairs via a photonic Bell-state measurement onto the two atoms a pair of entangled atoms at large distances can be prepared.
Here we present progress towards long-distance atom-atom entanglement. We have established a robust photonic fiber-communication channel of 300 m length, which allowed us to reliably distribute atom-photon entanglement [2]. Towards two entangled 87Rb atoms we present recent progress in the setup of our second mobile single-atom trap. First atom-photon correlation measurements are discussed.
[1] W. Rosenfeld et al., Towards a loophole-free test of Bells inequality with entangled pairs of neutral atoms, accepted for publication in Advanced Science Letters (2009)
[2] W. Rosenfeld et al., Long-Distance Atom-Photon Entanglement, arXiv:0808.3538v1