Patents by Inventor Yujun CHOI

Yujun CHOI 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).

  • Method and apparatus for quantum cryptographic communication
    Patent number: 9722785
    Abstract: An apparatus for quantum cryptographic communication includes a light source configured to generate an optical pulse which is transmitted to a plurality of quantum code sending devices, and a quantum entanglement measuring unit configured to receive the optical signal generated from each of the plurality of quantum code sending devices and measure a relation among quantum states of the optical signals received from the plurality of quantum code sending devices; the optical signal being generated by encoding a key to a quantum state of the optical pulse. The apparatus for quantum cryptographic communication may further include a signal direction determining unit, a reflector for reflecting the optical pulse or the optical signal, an arbitrary phase shifter, or a modulator for encoding a digital signal corresponding to the key to the optical pulse.
    Type: Grant
    Filed: January 6, 2015
    Date of Patent: August 1, 2017
    Assignee: Korea Institute of Science and Technology
    Inventors: Yong-Su Kim, Sang Wook Han, Sung Wook Moon, Yujun Choi
  • METHOD AND APPARATUS FOR QUANTUM CRYPTOGRAPHIC COMMUNICATION
    Publication number: 20160359624
    Abstract: An apparatus for quantum cryptographic communication includes a light source configured to generate an optical pulse which is transmitted to a plurality of quantum code sending devices, and a quantum entanglement measuring unit configured to receive the optical signal generated from each of the plurality of quantum code sending devices and measure a relation among quantum states of the optical signals received from the plurality of quantum code sending devices; the optical signal being generated by encoding a key to a quantum state of the optical pulse. The apparatus for quantum cryptographic communication may further include a signal direction determining unit, a reflector for reflecting the optical pulse or the optical signal, an arbitrary phase shifter, or a modulator for encoding a digital signal corresponding to the key to the optical pulse.
    Type: Application
    Filed: January 6, 2015
    Publication date: December 8, 2016
    Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Yong-Su KIM, Sang Wook HAN, Sung Wook MOON, Yujun CHOI