title: Holographic storage of biphoton entanglement.
abstract: Coherent and reversible storage of multiphoton entanglement with a multimode quantum memory is essential for scalable all-optical quantum information processing. Although a single photon has been successfully stored in different quantum systems, storage of multiphoton entanglement remains challenging because of the critical requirement for coherent control of the photonic entanglement source, multimode quantum memory, and quantum interface between them. Here we demonstrate a coherent and reversible storage of biphoton Bell-type entanglement with a holographic multimode atomic-ensemble-based quantum memory. The retrieved biphoton entanglement violates the Bell inequality for 1 μs storage time and a memory-process fidelity of 98% is demonstrated by quantum state tomography.
authors.affiliation: Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Han-Ning
authors.initials: HN
authors.lastname: Dai
authors.forename: Han
authors.initials: H
authors.lastname: Zhang
authors.forename: Sheng-Jun
authors.initials: SJ
authors.lastname: Yang
authors.forename: Tian-Ming
authors.initials: TM
authors.lastname: Zhao
authors.forename: Jun
authors.initials: J
authors.lastname: Rui
authors.forename: You-Jin
authors.initials: YJ
authors.lastname: Deng
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: Nai-Le
authors.initials: NL
authors.lastname: Liu
authors.forename: Shuai
authors.initials: S
authors.lastname: Chen
authors.forename: Xiao-Hui
authors.initials: XH
authors.lastname: Bao
authors.forename: Xian-Min
authors.initials: XM
authors.lastname: Jin
authors.forename: Bo
authors.initials: B
authors.lastname: Zhao
authors.forename: Jian-Wei
authors.initials: JW
authors.lastname: Pan