title: Quantum key distribution with 1.25 Gbps clock synchronization.
abstract: We have demonstrated the exchange of sifted quantum cryptographic key over a 730 meter free-space link at rates of up to 1.0 Mbps, two orders of magnitude faster than previously reported results. A classical channel at 1550 nm operates in parallel with a quantum channel at 845 nm. Clock recovery techniques on the classical channel at 1.25 Gbps enable quantum transmission at up to the clock rate. System performance is currently limited by the timing resolution of our silicon avalanche photodiode detectors. With improved detector resolution, our technique will yield another order of magnitude increase in performance, with existing technology.
authors.forename: J
authors.initials: J
authors.lastname: Bienfang
authors.forename: A
authors.initials: A
authors.lastname: Gross
authors.forename: A
authors.initials: A
authors.lastname: Mink
authors.forename: B
authors.initials: B
authors.lastname: Hershman
authors.forename: A
authors.initials: A
authors.lastname: Nakassis
authors.forename: X
authors.initials: X
authors.lastname: Tang
authors.forename: R
authors.initials: R
authors.lastname: Lu
authors.forename: D
authors.initials: D
authors.lastname: Su
authors.forename: Charles
authors.initials: C
authors.lastname: Clark
authors.forename: Carl
authors.initials: C
authors.lastname: Williams
authors.forename: E
authors.initials: E
authors.lastname: Hagley
authors.forename: Jesse
authors.initials: J
authors.lastname: Wen