Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 7: Flying/Stationary Qubit Conversion and Entanglement Generation SYQR 1 (with Q)
A 7.1: Vortrag
Montag, 17. März 2014, 10:30–10:45, UDL HS2002
Long distance entanglement of single trapped atoms — •Kai Redeker1, Daniel Burchardt1, Norbert Ortegel1, Markus Rau1, Julian Hofmann1, Michael Krug1, Markus Weber1, Wenjamin Rosenfeld1,2, and Harald Weinfurter1,2 — 1Fakultät für Physik, Ludwig-Maximilians- Universität München, D-80799 München, Germany — 2Max-Planck Institut für Quantenoptik, D-85748 Garching, Germany
Entanglement is an essential feature of quantum mechanics. Entanglement of stationary particles like atoms forms the basis of a quantum repeater for efficient long distance quantum communication.
We present an experiment on the generation of entanglement between two separately trapped 87Rb-atoms. In our scheme we use spontaneous emission that provides us with entanglement of the spin of the trapped atoms and polarization of the emitted photon together with entanglement swapping to generate entanglement between the atoms. So far we could demonstrate this scheme over a distance of 20m.[1] Additionally we could show quantum teleportation from a weak laser pulse onto the Zeeman-state of a single 87Rb-atom.
Our current work is on increasing the distance of 400 m and implementing a new fast atomic state measurement with ability to randomly chose the measurement basis on a very fast timescale. Such a System can enable device independent quantum key distribution and as such forms the elementary link of a quantum repeater.
[1]J.Hofmann et al. Science 337, 72 (2012)