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.
Volz
Jürgen
J
Department für Physik, Ludwig-Maximilians-Universität München, D-80799 München, Germany. juergen.volz@physik.uni-muenchen.de
Weber
Markus
M
Schlenk
Daniel
D
Rosenfeld
Wenjamin
W
Vrana
Johannes
J
Saucke
Karen
K
Kurtsiefer
Christian
C
Weinfurter
Harald
H