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:
Dec. 14, 2010
Filed:
Sep. 19, 2007
A. Craig Beal, Watertown, MA (US);
Michael J. Lagasse, Nahant, MA (US);
Audrius Berzanskis, Cambridge, MA (US);
A. Craig Beal, Watertown, MA (US);
Michael J. Lagasse, Nahant, MA (US);
Audrius Berzanskis, Cambridge, MA (US);
Mogiq Technologies, Inc., Somerville, MA (US);
Abstract
Systems and methods for enhanced quantum key distribution (QKD) using an actively compensated QKD system. The method includes exchanging quantum signals between first and second QKD stations and measuring the quantum signal error. An error signal Srepresentative of the system visibility error is then generated. An error-signal threshold Sthat defines a system visibility error limit is then selected. Those qubits measured with the condition S>Sare called 'above-threshold' qubits, while those qubits measured with the condition S≦Sare called 'below-threshold' qubits. Only below-threshold qubits are stored and used to form the final quantum key. This is accomplished by sending a blanking signal Sto the memory unit where the qubits are stored. The blanking signal prevents above-threshold qubits from being stored therein. The raw quantum key so formed has few errors and thus forms a longer final quantum key for a given number of exchanged quantum signals.