title: Expected number of quantum channels in quantum networks.
abstract: Quantum communication between nodes in quantum networks plays an important role in quantum information processing. Here, we proposed the use of the expected number of quantum channels as a measure of the efficiency of quantum communication for quantum networks. This measure quantified the amount of quantum information that can be teleported between nodes in a quantum network, which differs from classical case in that the quantum channels will be consumed if teleportation is performed. We further demonstrated that the expected number of quantum channels represents local correlations depicted by effective circles. Significantly, capacity of quantum communication of quantum networks quantified by ENQC is independent of distance for the communicating nodes, if the effective circles of communication nodes are not overlapped. The expected number of quantum channels can be enhanced through transformations of the lattice configurations of quantum networks via entanglement swapping. Our results can shed lights on the study of quantum communication in quantum networks.
authors.affiliation: School of Physics, Peking University, Beijing 100871, China.
authors.forename: Xi
authors.initials: X
authors.lastname: Chen
authors.affiliation: School of Physics, Peking University, Beijing 100871, China.
authors.forename: He-Ming
authors.initials: HM
authors.lastname: Wang
authors.affiliation: Department of Physics, Tsinghua University, Beijing 100084, China.
authors.forename: Dan-Tong
authors.initials: DT
authors.lastname: Ji
authors.affiliation: School of Physics, Peking University, Beijing 100871, China.
authors.forename: Liang-Zhu
authors.initials: LZ
authors.lastname: Mu
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.|State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Heng
authors.initials: H
authors.lastname: Fan