title: Quantum teleportation between remote atomic-ensemble quantum memories.
abstract: Quantum teleportation and quantum memory are two crucial elements for large-scale quantum networks. With the help of prior distributed entanglement as a "quantum channel," quantum teleportation provides an intriguing means to faithfully transfer quantum states among distant locations without actual transmission of the physical carriers [Bennett CH, et al. (1993) Phys Rev Lett 70(13):1895-1899]. Quantum memory enables controlled storage and retrieval of fast-flying photonic quantum bits with stationary matter systems, which is essential to achieve the scalability required for large-scale quantum networks. Combining these two capabilities, here we realize quantum teleportation between two remote atomic-ensemble quantum memory nodes, each composed of ∼10(8) rubidium atoms and connected by a 150-m optical fiber. The spin wave state of one atomic ensemble is mapped to a propagating photon and subjected to Bell state measurements with another single photon that is entangled with the spin wave state of the other ensemble. Two-photon detection events herald the success of teleportation with an average fidelity of 88(7)%. Besides its fundamental interest as a teleportation between two remote macroscopic objects, our technique may be useful for quantum information transfer between different nodes in quantum networks and distributed quantum computing.
authors.affiliation: Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Xiao-Hui
authors.initials: XH
authors.lastname: Bao
authors.forename: Xiao-Fan
authors.initials: XF
authors.lastname: Xu
authors.forename: Che-Ming
authors.initials: CM
authors.lastname: Li
authors.forename: Zhen-Sheng
authors.initials: ZS
authors.lastname: Yuan
authors.forename: Chao-Yang
authors.initials: CY
authors.lastname: Lu
authors.forename: Jian-Wei
authors.initials: JW
authors.lastname: Pan