The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 17, 2012
Filed:
Apr. 20, 2005
Jonathan Young, Newburyport, MA (US);
Jonathan Young, Newburyport, MA (US);
MagiQ Technologies, Inc., Somerville, MA (US);
Abstract
A method of autocalibrating the timing of the laser in a quantum key distribution (QKD) system is disclosed. The laser generates photon signals in response to a laser gating signals from a controller. The method includes first performing a laser gate scan to establish the optimum laser gating signal arrival time corresponding to an optimum bit-error rate when exchanging photon signals between encoding stations of the QKD system. Once the optimum laser gating signal arrival time is determined, the laser gate scan is terminated and laser gate dithering is initiated. Laser gate dithering involves varying the arrival time of the laser gating signal around the optimum value of the arrival time. Laser gate dithering provides minor adjustments to the laser gating signal arrival time to ensure that the system operates at or near the optimum bit-error rate.