基于相关光子对的单光子探测器量子效率校准技术研究

Research on Quantum Efficiency Calibration Technique for Single Photon Detector Based on Correlated photon Pairs

随着量子技术的发展,对极微弱光辐射的研究方向逐渐向量子化发展,利用相关光子对法对单光子探测器的相关参数进行测量。介绍了相关光子对法的原理及相关光子源中非线性晶体的关键参数设计方法,利用波长355 nm的激光器作为泵浦光源,泵浦相位匹配角为36°的BBO非线性晶体,实现了(450~1 675)nm的相关光子输出;泵浦相位匹配角为28.1°,32.91°,31.29°的BBO非线性晶体,实现了460 nm和1 550 nm,632.8 nm和807 nm,1 064 nm和532 nm的相关光子对共线输出。在460 nm,1 550 nm,632.8 nm,1 064 nm波长点利用符合测量对单光子探测器的量子效率进行测量,为实现多波长点至全波段单光子探测器校准奠定基础。

With the development of quantum technology,the research direction of extremely weak light radiation is gradually developing towards quantization.The main focus is on the measurement of the relevant parameters of the single photon detector based on the correlated photon pairs method.The principle of using conformal measurement and the design method of nonlinear crystals in correlated photon sources are introduced.A laser with wavelength of 355 nm is used as the pump light source.It pumps the BBO crystals with phase matching angle of 36° for the correlated photon pairs output from 450 nm to 1 675 nm.It pumps the BBO crystals with phase matching angles of 28.1°,32.91°,and 31.29° for the correlated photon common line output at 460 nm and 1 550 nm,632.8 nm and 807 nm,1064 nm and 532 nm.The quantum efficiency of the single-photon detector is measured at 460 nm,1550 nm,632.8 nm,and 1064 nm wavelength points using conformal measurements,laying the foundation for realizing multi-wavelength point to full-band single-photon detector testing.