Frankfurt 2006 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 40: Quanteninformation III
Q 40.2: Vortrag
Mittwoch, 15. März 2006, 11:25–11:40, HI
Experimental Atom-Photon Entanglement — •Markus Weber1, Jürgen Volz1, Wenjamin Rosenfeld1, Stefan Berner1, Peter Krebs1, Christian Kurtsiefer2, and Harald Weinfurter1,3 — 1Department für Physik, Ludwig-Maximilians-Universität München — 2Department of Physics, National University of Singapore — 3Max-Planck Institut für Quantenoptik, Garching
Entanglement between light and matter is a key resource for new applications in quantum communication and information forming the interface between atomic quantum memories and photonic quantum communication channels [1,2]. Especially for applications like quantum networks or the quantum repeater, atom-photon entanglement enables one to generate entanglement between atoms at remote locations [2,3].
Here we report the observation of high-fidelity entanglement between a single optically trapped 87Rb atom and a single spontaneously emitted photon at a wavelength of 780 nm. To verify the entanglement we introduce a single atom state analysis. This technique is used for full state tomography of the atom-photon qubit-pair. The efficiency of the atomic state detection and the observed entanglement fidelity are high enough to allow in a next step the generation of entangled atoms at large distances, ready for a final loophole-free test of Bell’s inequality.
[1] B. Blinov et al., Nature 428, 153 (2004).
[2] J. Volz & M. Weber et al., arXiv:quant-ph/0511183, accepted for publication in Phys. Rev. Lett.
[3] C. Simon et al., Phys. Rev. Lett. 91, 110405 (2003).