title: Quantum cryptography in free space.
abstract: The range of quantum cryptography systems using optical fibers is limited to roughly 30 km because amplifiers cannot be used. A fully operational system for quantum cryptography based on the transmission of single photons in free space under daylight conditions has been demonstrated. The feasibility of a global system for quantum cryptography based on a network of ground stations and satellites is discussed.
authors.forename: B C
authors.initials: BC
authors.lastname: Jacobs
authors.forename: J D
authors.initials: JD
authors.lastname: Franson