Patents by Inventor Yongjing Cai

Yongjing Cai 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: 11875223
    Abstract: A quantum bit control apparatus, including a control signal generator, optoelectronic detectors, a quantum chip, and a shielding apparatus, the optoelectronic detectors are disposed in the shielding apparatus, and an inner part of the shielding apparatus is in a vacuum state. The control signal generator is disposed in a first temperature area, and is configured to generate optical control signals and send the N optical control signals to the optoelectronic detectors. The optoelectronic detectors are disposed in a second temperature area having a temperature lower than of the first temperature area. The N optoelectronic detectors are configured to convert the received optical control signals into electronically controlled signals and send the electronically controlled signals to the quantum chip. The quantum chip is disposed in the second temperature area, and controls a quantum bit in the quantum chip based on the electronically controlled signals.
    Type: Grant
    Filed: April 28, 2021
    Date of Patent: January 16, 2024
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Zhengyu Li, Changzheng Su, Yang Zou, Yongjing Cai
  • Publication number: 20220328296
    Abstract: Example ion trap chips and quantum computing methods are described. One example ion trap chip includes a plurality of first ion traps and a plurality of second ion traps. Each first ion trap is configured to store an operation ion, where two adjacent first ion traps form one ion trap group. Each second ion trap corresponds to one ion trap group. Each second ion trap is configured to perform quantum operations of operation ions stored in a corresponding ion trap group, and each second ion trap is located between two first ion traps in a corresponding ion trap group. Operation ions stored in first ion traps in an ion trap group are transported to a corresponding second ion trap along a straight line.
    Type: Application
    Filed: June 10, 2022
    Publication date: October 13, 2022
    Inventors: Dongyang CAO, Jian PAN, Yuping WU, Yongjing CAI
  • Patent number: 11444758
    Abstract: A key generation method includes modulating a first key to a first light source signal, to obtain a modulated optical signal, splitting the modulated optical signal, to obtain a first sub modulated optical signal and a second sub modulated optical signal, attenuating the first sub modulated optical signal such that a quantity of photons included in each period of the first sub modulated optical signal is less than a preset value, and sending an attenuated first sub modulated optical signal to a receive-end device, and obtaining a second key carried in the second sub modulated optical signal, and storing the second key.
    Type: Grant
    Filed: May 7, 2020
    Date of Patent: September 13, 2022
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Zhengyu Li, Changzheng Su, Yang Zou, Yongjing Cai
  • Publication number: 20210279630
    Abstract: A quantum bit control apparatus, including a control signal generator, optoelectronic detectors, a quantum chip, and a shielding apparatus, the optoelectronic detectors are disposed in the shielding apparatus, and an inner part of the shielding apparatus is in a vacuum state. The control signal generator is disposed in a first temperature area, and is configured to generate optical control signals and send the N optical control signals to the optoelectronic detectors. The optoelectronic detectors are disposed in a second temperature area having a temperature lower than of the first temperature area. The N optoelectronic detectors are configured to convert the received optical control signals into electronically controlled signals and send the electronically controlled signals to the quantum chip. The quantum chip is disposed in the second temperature area, and controls a quantum bit in the quantum chip based on the electronically controlled signals.
    Type: Application
    Filed: April 28, 2021
    Publication date: September 9, 2021
    Inventors: Zhengyu Li, Changzheng Su, Yang Zou, Yongjing Cai
  • Publication number: 20200266978
    Abstract: A key generation method includes modulating a first key to a first light source signal, to obtain a modulated optical signal, splitting the modulated optical signal, to obtain a first sub modulated optical signal and a second sub modulated optical signal, attenuating the first sub modulated optical signal such that a quantity of photons included in each period of the first sub modulated optical signal is less than a preset value, and sending an attenuated first sub modulated optical signal to a receive-end device, and obtaining a second key carried in the second sub modulated optical signal, and storing the second key.
    Type: Application
    Filed: May 7, 2020
    Publication date: August 20, 2020
    Inventors: Zhengyu Li, Changzheng Su, Yang Zou, Yongjing Cai
  • Patent number: 10749608
    Abstract: Embodiments of this application relate to a signal receiving apparatus and method. The receiving apparatus includes: a signal receiving module, configured to detect a reference pulse signal in a received optical pulse signal where the optical pulse signal is the reference pulse signal and a quantum optical pulse signal; and a synchronization clock module, configured to obtain a modulation pulse signal based on the reference pulse signal. A first intensity modulator in the signal receiving module is configured to obtain, based on the modulation pulse signal, a first local-frequency optical pulse signal having same timing as the optical pulse signal, and the signal receiving module uses the first local-frequency optical pulse signal to interfere with the reference pulse signal and the quantum optical pulse signal separately to obtain a raw key.
    Type: Grant
    Filed: October 3, 2019
    Date of Patent: August 18, 2020
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Yongjing Cai, Liangliang Lu
  • Publication number: 20200044750
    Abstract: Embodiments of this application relate to a signal receiving apparatus and method. The receiving apparatus includes: a signal receiving module, configured to detect a reference pulse signal in a received optical pulse signal where the optical pulse signal is the reference pulse signal and a quantum optical pulse signal; and a synchronization clock module, configured to obtain a modulation pulse signal based on the reference pulse signal. A first intensity modulator in the signal receiving module is configured to obtain, based on the modulation pulse signal, a first local-frequency optical pulse signal having same timing as the optical pulse signal, and the signal receiving module uses the first local-frequency optical pulse signal to interfere with the reference pulse signal and the quantum optical pulse signal separately to obtain a raw key.
    Type: Application
    Filed: October 3, 2019
    Publication date: February 6, 2020
    Applicant: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Yongjing Cai, Liangliang Lu