Patents by Inventor Xiaogang QIANG

Xiaogang QIANG 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 for calibrating controllable phase shifters in multi-stage staggered Mach-Zehnder interferometer on optical chip
    Patent number: 11892742
    Abstract: The present invention discloses a method for calibrating controllable phase shifters in a multi-stage staggered Mach-Zehnder interferometer structure on an optical chip, aiming to solve the problem of calibrating the controllable phase shifters in a configurable optical network of the multi-stage staggered Mach-Zehnder interferometers. The technical solution is to calibrate the controllable phase shifters that can be calibrated in the optical network; and then to constitute calibration conditions for and calibrate inner phase shifters that has not been; and finally to constitute calibration conditions for and calibrate outer phase shifters that is not calibrated.
    Type: Grant
    Filed: September 10, 2020
    Date of Patent: February 6, 2024
    Assignee: NATIONAL UNIVERSITY OF DEFENSE TECHNOLOGY
    Inventors: Junjie Wu, Yang Wang, Xiaogang Qiang, Ping Xu, Jiangfang Ding, Mingtang Deng, Anqi Huang, Xiang Fu
  • INTEGRATED PHOTONIC CHIP STRUCTURE FOR UNIVERSAL QUANTUM WALK SIMULATION
    Publication number: 20210320725
    Abstract: The present invention discloses an integrated photonic chip structure for universal quantum walk simulation which combines the multiphoton source that can generate the spatially entangled multi-photon state and the linear optical network that can implement the unitary transformation, and establishes mapping between on-chip spatial-entangled multi-photon state and quantum walk state and mapping between on-chip linear optical unitary transformation and the evolution process of multi-particle quantum walk. By manipulating the spatially entangled multi-photon state generated via the multi-photon sources and the optical unitary transformation implemented via the universal linear optical networks, the chip structure can implement universal quantum walk simulation with the control over all parameters of multiple-particle quantum walks including such as evolution Hamiltonian, evolution time, initial evolution state and particle properties (i.e., particle indistinguishability and particle exchange symmetry).
    Type: Application
    Filed: April 13, 2021
    Publication date: October 14, 2021
    Applicant: NATIONAL UNIVERSITY OF DEFENSE TECHNOLOGY
    Inventors: Xiaogang QIANG, Junjie WU, Yizhi WANG
  • METHOD FOR CALIBRATING CONTROLLABLE PHASE SHIFTERS IN MULTI-STAGE STAGGERED MACH-ZEHNDER INTERFEROMETER ON OPTICAL CHIP
    Publication number: 20210072613
    Abstract: The present invention discloses a method for calibrating controllable phase shifters in a multi-stage staggered Mach-Zehnder interferometer structure on an optical chip, aiming to solve the problem of calibrating the controllable phase shifters in a configurable optical network of the multi-stage staggered Mach-Zehnder interferometers. The technical solution is to calibrate the controllable phase shifters that can be calibrated in the optical network; and then to constitute calibration conditions for and calibrate inner phase shifters that has not been; and finally to constitute calibration conditions for and calibrate outer phase shifters that is not calibrated.
    Type: Application
    Filed: September 10, 2020
    Publication date: March 11, 2021
    Applicant: NATIONAL UNIVERSITY OF DEFENSE TECHNOLOGY
    Inventors: Junjie WU, Yang WANG, Xiaogang QIANG, Ping XU, Jiangfang DING, Mingtang DENG, Anqi HUANG, Xiang FU