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:
Apr. 28, 2026
Filed:
Sep. 28, 2022
Arqit Limited, London, GB;
Arqit Limited, London, GB;
Abstract
A system and method for operating a quantum key distribution system including a receiver to receive an optical signal from a transmitter, the receiver including a first signal detection unit (1SDU) and a second signal detection unit (2SDU) for detecting events associated with single photons; an optical switch to alternate between a first switch position to direct a received optical signal to the 1SDU and a second switch position to direct a received optical signal to the 2SDU, such that the 1SDU and the 2SDU correspond to the first and second switch positions respectively; a detection time tagger to tag the events at the 1SDU and the 2SDU according to time, switch position, and signal detection unit, to introduce a correlation between a time in which an event is registered, the switch position, and the signal detection unit; and a timing recovery module connected to the detection time tagger.