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:
Feb. 10, 2026
Filed:
Jan. 24, 2022
Nec Corporation, Tokyo, JP;
National Institute of Information and Communications Technology, Tokyo, JP;
National University Corporation Hokkaido University, Sapporo, JP;
The University of Tokyo, Tokyo, JP;
Ken-Ichiro Yoshino, Tokyo, JP;
Mikio Fujiwara, Tokyo, JP;
Akihisa Tomita, Hokkaido, JP;
Masato Koashi, Tokyo, JP;
Masahiro Takeoka, Tokyo, JP;
Masahide Sasaki, Tokyo, JP;
NEC CORPORATION, Tokyo, JP;
NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, Koganei, JP;
NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY, Sapporo, JP;
THE UNIVERSITY OF TOKYO, Bunkyo-ku, JP;
Abstract
An object is to prevent eavesdropping in quantum key distribution. A synchronization signal reception device receives a synchronization signal that is an optical signal for defining a timing at which a quantum signal is detected, and outputs a reference signal corresponding to the synchronization signal. A clock signal generation unit generates a clock signal in response to the reference signal. A photon detection device detects a photon of the quantum signal in response to the clock signal. A timing of the clock signal randomly changes within a predetermined range.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile