Heidelberg 2015 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 31: Poster: Quantum Optics and Photonics II
Q 31.37: Poster
Tuesday, March 24, 2015, 17:00–19:00, C/Foyer
Status of a loophole-free Bell test with entangled atoms — •Kai Redeker1, Daniel Burchardt1, Norbert Ortegel1, Robert Garthoff1, Wenjamin Rosenfeld1,2, and Harald Weinfurter1,2 — 1Ludwig-Maximilians-Universität, München — 2Max-Planck-Institut für Quantenoptik, Garching
Bell’s inequality allows to test the validity of local hidden variable theories. To perform a conclusive Bell test on a pair of entangled particles, one has to fulfill two major requirements: the state measurements need to be highly efficient and space-like separated.
We present the status of our experiment which aims at fulfilling both requirements. We employ entanglement between single trapped 87Rb-atoms and single photons to create heralded entanglement between separated atoms[1]. To provide sufficient time for the measurement of atomic states, the distance between the atom traps has been extended to 400m. Our ionization-based state detection scheme reads the atomic state within less than 1µs (including random setting of the measurement basis) with a fidelity of 95%. Together with the heralded entanglement this will enable to close both loopholes in one experiment.