title: Remote entanglement between a single atom and a Bose-Einstein condensate.
abstract: 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 μs exceeds the photon duration by 2 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.
authors.affiliation: Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Lettner
authors.forename: M
authors.initials: M
authors.lastname: Mücke
authors.forename: S
authors.initials: S
authors.lastname: Riedl
authors.forename: C
authors.initials: C
authors.lastname: Vo
authors.forename: C
authors.initials: C
authors.lastname: Hahn
authors.forename: S
authors.initials: S
authors.lastname: Baur
authors.forename: J
authors.initials: J
authors.lastname: Bochmann
authors.forename: S
authors.initials: S
authors.lastname: Ritter
authors.forename: S
authors.initials: S
authors.lastname: Dürr
authors.forename: G
authors.initials: G
authors.lastname: Rempe