Patents by Inventor Guangcan Guo

Guangcan Guo 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).

  • Patent number: 9178623
    Abstract: The present invention utilizes a high-speed serial data transceiver to generate two high-speed electric pulse signals. After passing through a gain network, the signals are used for driving an electro-optic phase modulator (PM) so as to realize phase modulation of photon signals. The present invention may directly use a high-speed digital signal to realize a four-phase modulation function needed by the BB84 quantum key distribution protocol without using a digital to analog converter or an analog switch. This can prevent modulation rate from being restricted by links including digital-to-analog conversion, switching of the analog and the like. A dual-electrode electro-optic phase modulator scheme can also effectively reduce requirements for amplitude of a modulation driving signal, thus facilitating realization of high-speed phase modulation, which meets requirements of quantum key distribution.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: November 3, 2015
    Assignee: University of Science and Technology China
    Inventors: Wei Chen, Shuang Wang, Zhenqiang Yin, Dajun Huang, Yang Yang, Zheng Zhou, Deyong He, Yuhu Li, Zhengfu Han, Yonggang Wang, Guangcan Guo
  • Publication number: 20140205302
    Abstract: The present invention utilizes a high-speed serial data transceiver to generate two high-speed electric pulse signals. After passing through a gain network, the signals are used for driving an electro-optic phase modulator (PM) so as to realize phase modulation of photon signals. The present invention may directly use a high-speed digital signal to realize a four-phase modulation function needed by the BB84 quantum key distribution protocol without using a digital to analog converter or an analog switch. This can prevent modulation rate from being restricted by links including digital-to-analogue conversion, switching of the analogue and the like. A dual-electrode electro-optic phase modulator scheme can also effectively reduce requirements for amplitude of a modulation driving signal, thus facilitating realization of high-speed phase modulation, which meets requirements of quantum key distribution.
    Type: Application
    Filed: March 8, 2013
    Publication date: July 24, 2014
    Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
    Inventors: Wei Chen, Shuang Wang, Zhenqiang Yin, Dajun Huang, Yang Yang, Zheng Zhou, Deyong He, Yuhu Li, Zhengfu Han, Yonggang Wang, Guangcan Guo
  • Patent number: 8331797
    Abstract: The invention relates to a polarization-controlled encoding method, encoder and quantum key distribution system, which is characterized in that polarization maintaining light path or 90 degree rotation Faraday mirror are used inside the encoder to keep the polarization of the output pulses same, and that in the quantum key distribution system employing the polarization-controlled encoder the pulse emitted from transmitter is unidirectional-transmitted to receiver and then quantum key distribution is implemented using interference in the pulses according to the quantum key distribution protocol. The quantum key distribution system using the polarization-controlled encoder of the invention has the ability of avoiding the wiretapping to transmitter, receiver and quantum channel.
    Type: Grant
    Filed: August 19, 2004
    Date of Patent: December 11, 2012
    Assignee: University of Science and Technology of China
    Inventors: Zhengfu Han, Bing Zhu, Xiaofan Mo, Guangcan Guo
  • Patent number: 7596318
    Abstract: An addressing method of quantum network and a quantum network router are disclosed. There are at least three nodes in the network. The method comprises steps of: appointing an address serial number for every node; sending photon signals with different wavelength from one node to other nodes, wherein the signal source wavelength and node address are regarded as an addressing badge; determining, by every node, the source of signal according to the addressing badge of received photon signals. Quantum network router comprises a photon signal allocator including N sets of optical components, one end of every optical component is mix-wavelength interface, and the other end includes separate wavelength interfaces; an external interface comprising mix-wavelength interfaces of optical components, separate wavelength interfaces of different optical components, which transmit the same wavelength signals, connect one to one.
    Type: Grant
    Filed: June 25, 2004
    Date of Patent: September 29, 2009
    Assignee: University of Science and Technology of China
    Inventors: Zhengfu Han, Tao Zhang, Guangcan Guo
  • Publication number: 20080037998
    Abstract: The invention relates to a polarization-controlled encoding method, encoder and quantum key distribution system, which is characterized in that polarization maintaining light path or 90 degree rotation Faraday mirror are used inside the encoder to keep the polarization of the output pulses same, and that in the quantum key distribution system employing the polarization-controlled encoder the pulse emitted from transmitter is unidirectional-transmitted to receiver and then quantum key distribution is implemented using interference in the pulses according to the quantum key distribution protocol. The quantum key distribution system using the polarization-controlled encoder of the invention has the ability of avoiding the wiretapping to transmitter, receiver and quantum channel.
    Type: Application
    Filed: August 19, 2004
    Publication date: February 14, 2008
    Applicant: University of Science and Technology of China
    Inventors: Han Zhengfu, Bing Zhu, Xiaofan Mo, Guangcan Guo
  • Publication number: 20060210270
    Abstract: An addressing method of quantum network and a quantum network router are disclosed. There are at least three nodes in the network. The method comprises steps of: appointing an address serial number for every node; sending photon signals with different wavelength from one node to other nodes, wherein the signal source wavelength and node address are regarded as an addressing badge; determining, by every node, the source of signal according to the addressing badge of received photon signals. Quantum network router comprises a photon signal allocator including N sets of optical components, one end of every optical component is mix-wavelength interface, and the other end includes separate wavelength interfaces; an external interface comprising mix-wavelength interfaces of optical components, separate wavelength interfaces of different optical components, which transmit the same wavelength signals, connect one to one.
    Type: Application
    Filed: June 25, 2004
    Publication date: September 21, 2006
    Inventors: Zhengfu Han, Tao Zhang, Guangcan Guo