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:
Aug. 13, 2013
Filed:
Dec. 28, 2010
Mikio Fujiwara, Tokyo, JP;
Morio Toyoshima, Tokyo, JP;
Masahide Sasaki, Tokyo, JP;
Akihisa Tomita, Tokyo, JP;
Yoshihiro Nambu, Tokyo, JP;
Ken-ichiro Yoshino, Tokyo, JP;
Mikio Fujiwara, Tokyo, JP;
Morio Toyoshima, Tokyo, JP;
Masahide Sasaki, Tokyo, JP;
Akihisa Tomita, Tokyo, JP;
Yoshihiro Nambu, Tokyo, JP;
Ken-ichiro Yoshino, Tokyo, JP;
National Institute of Information and Communications Technology, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
It is an object of the present invention to provide a network system for quantum key distribution (QKD) for free space and fiber networks. The system of the present invention generates a couple of photons which have different wavelength and inputs each of the photons into the asymmetric Mach-Zehnder interferometer to obtain time-bin entangled state. It provides polarization information with one part of the photons. Then it can obtain hybrid quantum entanglement. The system of the present invention may be used hybrid quantum key distribution system applied for both free space and fibers.