Remote Entanglement between a Single Atom and a Bose-Einstein Condensate
  Entanglement between stationary systems at remote locations is a key resource for quantum networks. We report on the experimental generation of remote entanglement between a single atom inside an optical cavity and a Bose-Einstein condensate (BEC). To produce this, a single photon is created in the atom-cavity system, thereby generating atom-photon entanglement. The photon is transported to the BEC and converted into a collective excitation in the BEC, thus establishing matter-matter entanglement. After a variable delay, this entanglement is converted into photon-photon entanglement. The matter-matter entanglement lifetime of 100 $\mu$s exceeds the photon duration by two orders of magnitude. The total fidelity of all concatenated operations is 95%. This hybrid system opens up promising perspectives in the field of quantum information. 
M. Lettner, M. M\"ucke, S. Riedl, C. Vo, C. Hahn, S. Baur, J.   Bochmann, S. Ritter, S. D\"urr, G. Rempe
quant-ph cond-mat.quant-gas