Hamburg 2009 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster IV
Q 56.47: Poster
Donnerstag, 5. März 2009, 16:30–19:00, VMP 9 Poster
Towards a loophole-free test of Bell’s inequality — •Norbert Ortegel1, Julian Hofmann1, Michael Krug1, Florian Henkel1, 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
Tests of Bell’s inequality are subject to two loopholes - the detection and the locality loophole. Previous experiments with entangled photons [1] closed the locality loophole whereas experiments with entangled ions [2] closed the detection loophole.
In order to close both loopholes simultaneously, one can combine the high readout efficiency of atomic states with the possibility to distribute entanglement over long distances via photons. For that purpose we are setting up two spatially separated single-atom traps, which allow to create entangled atom-photon pairs [3]. A Bell-state measurement on the two photons allows to swap the entanglement to the atoms.
As a first step towards this goal we achieved to distribute for the first time atom-photon entanglement over a 300m long optical fiber [4]. In order to ultimately close the detection and locality loophole we are developing a sub-µs atomic detection based on state selective ionization. First characterizations revealed detection efficiencies of 93,7%.
[1] G. Weihs et al., PRL 81, 5039 (1998)
[2] D. N. Matsukevich et al., PRL 100, 150404 (2008)
[3] J. Volz, M. Weber et al., PRL 96, 030404(2006)
[4] W. Rosenfeld et al., arXiv:0808.3538v1 accepted for publ. in PRL