title: Practical quantum key distribution with polarization entangled photons.
abstract: We present an entangled-state quantum cryptography system that operated for the first time in a real-world application scenario. The full key generation protocol was performed in real-time between two distributed embedded hardware devices, which were connected by 1.45 km of optical fiber, installed for this experiment in the Vienna sewage system. The generated quantum key was immediately handed over and used by a secure communication application.
authors.forename: A
authors.initials: A
authors.lastname: Poppe
authors.forename: A
authors.initials: A
authors.lastname: Fedrizzi
authors.forename: R
authors.initials: R
authors.lastname: Ursin
authors.forename: H
authors.initials: H
authors.lastname: Böhm
authors.forename: T
authors.initials: T
authors.lastname: Lörunser
authors.forename: O
authors.initials: O
authors.lastname: Maurhardt
authors.forename: M
authors.initials: M
authors.lastname: Peev
authors.forename: M
authors.initials: M
authors.lastname: Suda
authors.forename: C
authors.initials: C
authors.lastname: Kurtsiefer
authors.forename: H
authors.initials: H
authors.lastname: Weinfurter
authors.forename: T
authors.initials: T
authors.lastname: Jennewein
authors.forename: A
authors.initials: A
authors.lastname: Zeilinger