Accession Number:

ADA510894

Title:

Quantum Key Distribution System Operating at Sifted-Key Rate Over 4 Mbit/s

Descriptive Note:

Journal article

Corporate Author:

NATIONAL INST OF STANDARDS AND TECHNOLOGY GAITHERSBURG MD

Report Date:

2006-01-01

Pagination or Media Count:

9.0

Abstract:

A complete fiber-based polarization encoding quantum key distribution QKD system based on the BB84 protocol has been developed at National Institute of Standard and Technology NIST. The system can be operated at a sifted key rate of more than 4 Mbits over optical fiber of length 1 km and mean photon number 0.1. The quantum channel uses 850 nm photons from attenuated high speed VCSELs and the classical channel uses 1550 nm light from normal commercial coarse wavelength division multiplexing devices. Sifted-key rates and quantum error rates at different transmission rates are measured as a function of distance fiber length. A polarization auto-compensation module has been developed and utilized to recover the polarization state and to compensate for temporal drift. An automatic timing alignment device has also been developed to quickly handle the initial configuration of quantum channels so that detection events fall into the correct timing window. These automated functions make the system more practical for integration into existing optical local area networks.

Subject Categories:

  • Cybernetics
  • Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE