Düsseldorf 2007 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 35: Poster Quantenkommunikation
Q 35.1: Poster
Tuesday, March 20, 2007, 16:30–18:30, Poster C
Long-distance atom-photon entanglement — •Fredrik Hocke1, Florian Henkel1, Michael Krug1, Wenjamin Rosenfeld1, Jürgen Volz1, Markus Weber1, and Harald Weinfurter1,2 — 1Department für Physik der LMU, 80799 München — 2Max-Planck-Institut für Quantenoptik, 85748 Garching
Entanglement is a key element of quantum information and communication applications. For future applications as e.g. the realization of quantum networks or the quantum repeater, entanglement between different species like atoms and photons is necessary, because it provides an interface between atomic quantum memories and photonic quantum communication channels.
In our experiment, a single optically trapped 87Rb-atom is excited to a state with two decay channels in a Λ-type configuration. In the following spontaneous decay the spin state of the atom is entangled with the polarization of the emitted photon[1]. So far, we have demonstrated this atom-photon entanglement over distances of a few meters. However, for future applications in quantum communication the spatial separation has to be extended to macroscopic distances.
Here we report first experimental steps towards long-distance atom-photon entanglement (with a distance of a few 100 meters) using fiber-based quantum communication channels.
[1] J. Volz et al., Phys. Rev. Lett. 96, 030404 (2006)