Observation of entanglement of a single photon with a trapped atom.
We report the observation of entanglement between a single trapped atom and a single photon at a wavelength suitable for low-loss communication over large distances, thereby achieving a crucial step towards long range quantum networks. 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 detection efficiency and the 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 Bell experiment.
Department für Physik, Ludwig-Maximilians-Universität München, D-80799 München, Germany. juergen.volz@physik.uni-muenchen.de
Jürgen
J
Volz
Markus
M
Weber
Daniel
D
Schlenk
Wenjamin
W
Rosenfeld
Johannes
J
Vrana
Karen
K
Saucke
Christian
C
Kurtsiefer
Harald
H
Weinfurter