Remote Entanglement between a Single Atom and a Bose-Einstein Condensate

Details Remote Entanglement between a Single Atom and a Bose-Einstein Condensate Remote Entanglement between a Single Atom and a Bose-Einstein Condensate

2011-02-21

arxiv.org/abs/1102.4285v2

Phys. Rev. Lett. 106, 210503 (2011)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevLett.106.210503

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.

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