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Title: Polarization tracking system for free-space optical communication, including quantum communication

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.
Inventors:
; ; ;
Issue Date:
OSTI Identifier:
1416319
Assignee:
Los Alamos National Security, LLC (Los Alamos, NM) LANL
Patent Number(s):
9,866,379
Application Number:
13/600,918
Contract Number:
AC52-06NA25396
Resource Relation:
Patent File Date: 2012 Aug 31
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

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