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. 06, 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, Tokyo, JP;
Abstract
An object is to prevent eavesdropping in quantum key distribution. A decoding unit decodes a quantum signal incident thereinto. A plurality of detect photons of the decoded quantum signal output from the decoding unit. A signal processing unit detects bits of the decoded quantum signal based on photon detection results of the plurality of detectors. A control unit perform switching processing by switching destinations to which two decoded quantum signals corresponding to one encoding basis are output between the plurality of detectors, and switching the bits detected by the signal processing unit based on the respective photon detection results of the plurality of detectors.