title: Synchronized independent narrow-band single photons and efficient generation of photonic entanglement.
abstract: We create independent, synchronized single-photon sources with built-in quantum memory based on two remote cold atomic ensembles. The synchronized single photons are used to demonstrate efficient generation of entanglement. The resulting entangled photon pairs violate a Bell's inequality by 5 standard deviations. Our synchronized single photons with their long coherence time of 25 ns and the efficient creation of entanglement serve as an ideal building block for scalable linear optical quantum information processing.
authors.affiliation: Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany.
authors.forename: Zhen-Sheng
authors.initials: ZS
authors.lastname: Yuan
authors.forename: Yu-Ao
authors.initials: YA
authors.lastname: Chen
authors.forename: Shuai
authors.initials: S
authors.lastname: Chen
authors.forename: Bo
authors.initials: B
authors.lastname: Zhao
authors.forename: Markus
authors.initials: M
authors.lastname: Koch
authors.forename: Thorsten
authors.initials: T
authors.lastname: Strassel
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhao
authors.forename: Gan-Jun
authors.initials: GJ
authors.lastname: Zhu
authors.forename: Jörg
authors.initials: J
authors.lastname: Schmiedmayer
authors.forename: Jian-Wei
authors.initials: JW
authors.lastname: Pan