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1. (WO2018196478) METHOD FOR CONTROLLING SPECTRAL PROPERTIES OF QUANTUM-CORRELATED PHOTON PAIR USING QUANTUM INTERFERENCE

Pub. No.:    WO/2018/196478    International Application No.:    PCT/CN2018/077374
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Wed Feb 28 00:59:59 CET 2018
IPC: G02F 1/35
G02F 1/365
Applicants: TIANJIN UNIVERSITY
天津大学
Inventors: LI, Xiaoying
李小英
CUI, Liang
崔亮
SU, Jie
苏杰
LI, Jiamin
李嘉敏
Title: METHOD FOR CONTROLLING SPECTRAL PROPERTIES OF QUANTUM-CORRELATED PHOTON PAIR USING QUANTUM INTERFERENCE
Abstract:
A method for controlling the spectral properties of a quantum-correlated photon pair using quantum interference, comprising the following steps: using a multi-stage cascade structure consisting of a segment of nonlinear medium, a segment of dispersive medium, …, and a segment of nonlinear medium in sequence, or using a two-stage cascade structure consisting of a segment of nonlinear medium, a segment of dispersion-controllable medium, and a segment of nonlinear medium in sequence; the nonlinear media and the dispersive media in the multi-stage cascade structure are arranged sequentially and alternately, each segment of nonlinear medium is regarded as one stage, and the number of the stages of the multi-stage cascade structure is greater than or equal to two; an optical wave can be incident from one of the multi-stage cascade structure or the two-stage cascade structure, and exit from the other end to form an optical wave path; a pulsed laser is used for pumping the multi-stage cascade structure or the two-stage cascade structure, and a quantum-correlated photon pair is generated by a cascaded parametric process in the cascade structure; due to a quantum interference effect in the cascaded parametric process, the intensity of the quantum-correlated photon pair causes periodic constructive and destructive interference at different wavelengths; for the multi-stage cascade structure, the wavelength corresponding to the constructive and destructive interference can be tuned by changing the number of the stages of the multi-stage cascade structure, the length of the dispersive media, or substituting dispersive media having different dispersion properties; for the two-stage cascade structure, the wavelength corresponding to the constructive and destructive interference can be tuned by changing the dispersion properties and length of the dispersion-controllable medium; a filtering and collecting device is used for collecting and outputting the quantum-correlated photon pair at the wavelength corresponding to the constructive interference.