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POLARIZATION TRACKING SYSTEM FOR FREE-SPACE OPTICAL COMMUNICATION, INCLUDING QUANTUM COMMUNICATION

United States Patent Application

20130083925
A1
View the Complete Application at the US Patent & Trademark Office
Los Alamos National Laboratory - Visit the Technology Transfer Division Website
Quantum communication transmitters include beacon lasers that transmit a beacon optical signal in a predetermined state of polarization such as one of the states of polarization of a quantum communication basis. Changes in the beacon polarization are detected at a receiver, and a retarder is adjusted so that the states of polarization in a received quantum communication optical signal are matched to basis polarizations. The beacon and QC signals can be at different wavelengths so that the beacon does not interfere with detection and decoding of the QC optical signal.
Nordholt, Jane Elizabeth (Los Alamos, NM), Newell, Raymond Thorson (Santa Fe, NM), Peterson, Charles Glen (Los Alamos, NM), Hughes, Richard John (Los Alamos, NM)
Los Alamos National Security, LLC
13/ 600,918
August 31, 2012
ACKNOWLEDGMENT OF GOVERNMENT SUPPORT [0002] This invention was made with government support under Contract No. DE-AC52-06NA25396 awarded by the U.S. Department of Energy. The government has certain rights in the invention.