公开(公告)号：US20200072915A1

公开(公告)日：2020-03-05

申请号：US16491702

申请日：2017-11-14

Applicant: University of Science and Technology of China

Inventor： Zongquan Zhou ,  Yu Ma ,  Tao Tu ,  Chuanfeng Li ,  Guangcan Guo

IPC: G01R33/12 ,  G01R33/032 ,  G01N21/65 ,  H01S3/16

Abstract: Provided is a quantum sensor based on a rare-earth-ion doped optical crystal, having: a rare-earth-ion doped optical crystal; a low temperature providing unit, which provides a low temperature operating environment to the rare-earth-ion doped optical crystal; a constant magnetic field generation unit, which applies a constant magnetic field to the rare-earth-ion doped optical crystal; a light field generation unit, which provides a light field performing optical pumping on the rare-earth-ion doped optical crystal to prepare the rare-earth-ions in an initial spin state, and a light field for exciting Raman scattering of the rare-earth-ion doped optical crystal; a pulsed magnetic field generation unit, which applies a pulsed magnetic field perpendicular to the constant magnetic field to the rare-earth-ion doped optical crystal to make the rare-earth-ion doped optical crystal generate a spin echo; and a heterodyne Raman scattering light field detection and analysis unit, which detects and analyzes a Raman scattering light field radiated from the rare-earth-ion doped optical crystal. Further provided are uses of this quantum sensor for magnetic field sensing and electric field sensing as well as a sensing method.

公开(公告)号：US10802102B2

公开(公告)日：2020-10-13

申请号：US16331457

申请日：2018-03-08

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA

Inventor： Zongquan Zhou ,  Peiyun Li ,  Chao Liu ,  Xiao Liu ,  Chuanfeng Li ,  Guangcan Guo

IPC: G01R33/60 ,  G01R33/31

Abstract: A pulsed electron paramagnetic resonance spectrometer comprises: a microwave excitation generating unit for generating at least one microwave pulse; a microwave conducting unit comprising a resonant cavity and a microwave transmission line for transmitting microwaves, wherein the microwave transmission line is connected between the microwave excitation generating unit and the resonant cavity, and the resonant cavity is for placing a sample; a cryostat and magnet unit comprising a cryostat that performs ultra-low temperature cooling for the microwave resonant cavity, the microwave transmission line being disposed to pass through the cryostat and connected to the resonant cavity; the cryostat and magnet unit further comprises a magnet that provides a resonance test magnetic field around the sample, the resonant cavity being disposed in a room temperature gap of the magnet. The device of the present disclosure characteristics in ultra-low sample temperature (0.1 Kelvin) and is fully functional and easy to operate.

公开(公告)号：US11313925B2

公开(公告)日：2022-04-26

申请号：US16491702

申请日：2017-11-14

Applicant: University of Science and Technology of China

Inventor： Zongquan Zhou ,  Yu Ma ,  Tao Tu ,  Chuanfeng Li ,  Guangcan Guo

IPC: G01N21/65 ,  G01R33/12 ,  G01R33/032 ,  H01S3/16 ,  G01R33/07

Abstract: Provided is a quantum sensor based on a rare-earth-ion doped optical crystal, having: a rare-earth-ion doped optical crystal; a low temperature providing unit, which provides a low temperature operating environment to the rare-earth-ion doped optical crystal; a constant magnetic field generation unit, which applies a constant magnetic field to the rare-earth-ion doped optical crystal; a light field generation unit, which provides a light field performing optical pumping on the rare-earth-ion doped optical crystal to prepare the rare-earth-ions in an initial spin state, and a light field for exciting Raman scattering of the rare-earth-ion doped optical crystal; a pulsed magnetic field generation unit, which applies a pulsed magnetic field perpendicular to the constant magnetic field to the rare-earth-ion doped optical crystal to make the rare-earth-ion doped optical crystal generate a spin echo; and a heterodyne Raman scattering light field detection and analysis unit, which detects and analyzes a Raman scattering light field radiated from the rare-earth-ion doped optical crystal. Further provided are uses of this quantum sensor for magnetic field sensing and electric field sensing as well as a sensing method.

公开(公告)号：US12231176B1

公开(公告)日：2025-02-18

申请号：US18924618

申请日：2024-10-23

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA

Inventor： Shuang Wang ,  Jiaxuan Li ,  Yuanguanjie Fan ,  Fengyu Lu ,  Zhenqiang Yin ,  Deyong He ,  Wei Chen ,  Zheng Zhou ,  Guangcan Guo ,  Zhengfu Han

IPC: H04B10/00 ,  H04B10/532 ,  H04B10/70 ,  H04J14/00

Abstract: A quantum key distribution system is provided, including: a sending terminal, a measurement terminal, a receiving terminal, and at least one polarization controller. The sending terminal is configured to generate a quantum optical signal and receive a detection result. The measurement terminal includes a beam splitter and two single-photon detectors, the beam splitter is configured to generate two measurement optical signals based on the quantum optical signal, and the two single-photon detectors are configured to generate the detection result. The receiving terminal is configured to receive the detection result. The at least one polarization controller is provided in the sending terminal, the measurement terminal or the receiving terminal, and performs a polarization processing on the quantum optical signal or the detection result using a target transmittance matrix determined based on the detection result, so as to obtain a polarized quantum optical signal or a polarized detection result.

公开(公告)号：US09178623B2

公开(公告)日：2015-11-03

申请号：US13985565

申请日：2013-03-08

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA

Inventor： Wei Chen ,  Shuang Wang ,  Zhenqiang Yin ,  Dajun Huang ,  Yang Yang ,  Zheng Zhou ,  Deyong He ,  Yuhu Li ,  Zhengfu Han ,  Yonggang Wang ,  Guangcan Guo

IPC: H04B10/04 ,  H04B10/556 ,  H04B10/70 ,  H04L9/08

CPC classification number: H04B10/5561 ,  H04B10/70 ,  H04L9/0852

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.

Abstract translation: 本发明利用高速串行数据收发器来产生两个高速电脉冲信号。 通过增益网络后，信号用于驱动电光相位调制器（PM），以实现光信号的相位调制。 本发明可以直接使用高速数字信号来实现BB84量子密钥分发协议所需的四相调制功能，而不使用数模转换器或模拟开关。 这可以防止调制速率被包括数模转换，模拟转换等的链接所限制。 双电极电光相位调制器方案还可以有效降低对调制驱动信号幅度的要求，从而有助于实现高速相位调制，满足量子密钥分配的要求。