title: Quantum key distribution over an installed multimode optical fiber local area network.
abstract: We have investigated the possibility of a multimode fiber link for a quantum channel. Transmission of light in an extremely underfilled mode distribution promises a single-mode-like behavior in the multimode fiber. To demonstrate the performance of the fiber link we performed quantum key distribution, on the basis of the BB84 four-state protocol, over 550 m of an installed multimode optical fiber local area network, and the quantum-bit-error rate of 1.09 percent was achieved.
authors.forename: Naoto
authors.initials: N
authors.lastname: Namekata
authors.forename: Shigehiko
authors.initials: S
authors.lastname: Mori
authors.forename: Shuichiro
authors.initials: S
authors.lastname: Inoue