title: Quantum telecommunication based on atomic cascade transitions.
abstract: A quantum repeater at telecommunications wavelengths with long-lived atomic memory is proposed, and its critical elements are experimentally demonstrated using a cold atomic ensemble. Via atomic cascade emission, an entangled pair of 1.53 microm and 780 nm photons is generated. The former is ideal for long-distance quantum communication, and the latter is naturally suited for mapping to a long-lived atomic memory. Together with our previous demonstration of photonic-to-atomic qubit conversion, both of the essential elements for the proposed telecommunications quantum repeater have now been realized.
authors.affiliation: School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0430, USA.
authors.forename: T
authors.initials: T
authors.lastname: Chanelière
authors.forename: D N
authors.initials: DN
authors.lastname: Matsukevich
authors.forename: S D
authors.initials: SD
authors.lastname: Jenkins
authors.forename: T A B
authors.initials: TA
authors.lastname: Kennedy
authors.forename: M S
authors.initials: MS
authors.lastname: Chapman
authors.forename: A
authors.initials: A
authors.lastname: Kuzmich