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:
Jul. 28, 2026
Filed:
Mar. 14, 2023
Fujitsu Limited, Kawasaki, JP;
Tetsuro Ishiguro, Kawasaki, JP;
Kenichi Kawaguchi, Ebina, JP;
Toshiyuki Miyazawa, Kawasaki, JP;
Toshiki Iwai, Atsugi, JP;
Tetsuya Miyatake, Isehara, JP;
Yoshiyasu Doi, Yokohama, JP;
Shintaro Sato, Yokohama, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A quantum circuit includes a plurality of first optical waveguides and a plurality of second optical waveguides formed on a substrate and each of which includes a single-photon source; a first multiplexer formed on the substrate and configured to condense first photons propagated through the plurality of first optical waveguides; a second multiplexer formed on the substrate and configured to condense second photons propagated through the plurality of second optical waveguides; a branching element configured to introduce the first photons condensed by the first multiplexer and the second photons condensed by the second multiplexer and branch the first photons and the second photons in a first direction and a second direction; a first detector configured to detect the first photons and the second photons branched in the first direction; and a second detector configured to detect the first photons and the second photons branched in the second direction.