Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 23: Poster 2: Intersectional Session
Q 23.41: Poster
Dienstag, 15. März 2011, 18:00–21:00, P1
Entanglement between two remotely trapped atoms — •N. Ortegel1, J. Hofmann1, M. Krug1, F. Henkel1, W. Rosenfeld1, M. Weber1, and H. Weinfurter1,2 — 1Fakultät für Physik der LMU München, Schellingstr. 4/III, 80799 München — 2Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching
Entangled atom-atom pairs can serve as basic elements in quantum communication schemes such as quantum repeaters. They can also be used to carry out fundamental tests of quantum mechanics such as tests of Bell's inequality.
In our experiment we generate an entangled pair of single atoms that are located in two independent optical dipole traps by using the entanglement-swapping protocol.
Here we present details of the main building blocks of this experiment: Creation of entanglement between the electronic spin state of an atom and the polarization state of a photon [1], distribution of atom-photon entanglement over a distance of 300 m via an actively stabilized optical fiber link [2], a Bell-state measurement of the two photons by two-photon interference at a fiber beam-splitter and finally a sub-microsecond readout scheme of the atomic state by state-selective ionization [3]. The latter promises to be fast and efficient enough to allow for a loophole-free test of Bell's inequality [4].
[1] J. Volz et al., PRL 96 (2006)
[2] W. Rosenfeld et al., PRL 101 (2008)
[3] F. Henkel et al., arXiv:1008.1910v2 (2010)
[4] W. Rosenfeld et al., Adv. Sci. Lett. 2, 469 (2009)