Patents by Inventor Masahiro Takeoka

Masahiro Takeoka has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • RECEPTION DEVICE, QUANTUM KEY DISTRIBUTION SYSTEM, AND METHOD FOR DETECTING QUANTUM SIGNAL
    Publication number: 20240089093
    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.
    Type: Application
    Filed: January 24, 2022
    Publication date: March 14, 2024
    Applicants: NEC CORPORATION, NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY, THE UNIVERSITY OF TOKYO
    Inventors: Ken-ichiro YOSHINO, Mikio FUJIWARA, Akihisa TOMITA, Masato KOASHI, Masahiro TAKEOKA, Masahide SASAKI
  • PHOTON DETECTION DEVICE, RECEPTION DEVICE, QUANTUM KEY DISTRIBUTION SYSTEM, AND METHOD FOR DETECTING QUANTUM SIGNAL
    Publication number: 20240080184
    Abstract: An object is to prevent eavesdropping in quantum key distribution. A photon detector outputs an output current indicating a result of detecting a quantum signal. A current-voltage conversion unit converts the output current into an output voltage signal. An analog-to-digital converter outputs an output voltage signal obtained by analog-digital conversion of the output voltage signal. A signal processing unit performs predetermined signal processing on the output voltage signal, and outputs a photon detection signal indicating a result of detecting the quantum signal. When a time difference between a timing at which the quantum signal is incident into the photon detector and a reference timing determined based on a clock signal is not within a determination range, the photon detection signal is not output from the signal processing unit.
    Type: Application
    Filed: January 24, 2022
    Publication date: March 7, 2024
    Applicants: NEC Corporation, National Institute of Information and Communications Technology, NATIONAL UNIVERSTIY CORPORATION HOKKAIDO UNIVERSTIY, The University of Tokyo
    Inventors: Ken-ichiro YOSHINO, Mikio FUJIWARA, Akihisa TOMITA, Masato KOASHI, Masahiro TAKEOKA, Masahide SASAKI
  • Quantum source coding apparatus and quantum information communication system
    Patent number: 7403713
    Abstract: Quantum source coding apparatus for communication of quantum information comprising: a quantum state preparation device for converting input messages into block messages; a coding device for producing coded signals by compressing the block messages prepared by the quantum state preparation device; and an output device for outputting the coded signals produced by the coding device.
    Type: Grant
    Filed: March 4, 2004
    Date of Patent: July 22, 2008
    Assignees: University of Hertfordshire, National Institute of Information and Communications Technology, University of Strathelyde
    Inventors: Masahide Sasaki, Yasuyoshi Mitsumori, Atsushi Hasegawa, Masahiro Takeoka, John A. Vaccaro, Stephen M. Barnett, Erika Andersson
  • Quantum source coding apparatus and quantum information communication system
    Publication number: 20040234264
    Abstract: Quantum source coding apparatus for communication of quantum information comprising: a quantum state preparation device for converting input messages into block messages; a coding device for producing coded signals by compressing the block messages prepared by the quantum state preparation device; and an output device for outputting the coded signals produced by the coding device.
    Type: Application
    Filed: March 4, 2004
    Publication date: November 25, 2004
    Inventors: Masahide Sasaki, Yasuyoshi Mitsumori, Atsushi Hasegawa, Masahiro Takeoka, John A. Vaccaro, Stephen M. Barnett, Erika Andersson