Bright single-photon sources in the telecom band by deterministically coupling single quantum dots to a hybrid circular Bragg resonator  

作　　者：SHI-WEN XU YU-MING WEI RONG-BIN SU XUE-SHI LI PEI-NIAN HUANG SHUN-FA LIU XIAO-YING HUANG YING YU JIN LIU XUE-HUA WANG 

机构地区：[1]State Key Laboratory of Optoelectronic Materials and Technologies,School of Physics,School of Electronics and Information Technology,Sun Yat-sen University,Guangzhou 510275,China

出　　处：《Photonics Research》2022年第8期I0001-I0006,共6页光子学研究（英文版）

基　　金：National Key Research and Development Program of China(2018YFA0306103);Special Project for Research and Development in Key areas of Guangdong Province(2018B030329001);National Natural Science Foundation of China(11874437,12074442,62035017,91836303);Guangdong Special Support Plan(2019JC05X397)。

摘　　要：High-performance solid-state quantum sources in the telecom band are of paramount importance for longdistance quantum communications and the quantum Internet by taking advantage of a low-loss optical fiber network.Here,we demonstrate bright telecom-wavelength single-photon sources based on In(Ga)As/Ga As quantum dots(QDs)deterministically coupled to hybrid circular Bragg resonators(h-CBRs)by using a wide-field fluorescence imaging technique.The QD emissions are redshifted toward the telecom O-band by using an ultra-low In As growth rate and an In Ga As strain reducing layer.Single-photon emissions under both continuous wave(CW)and pulsed operations are demonstrated,showing high brightness with count rates of 1.14 MHz and 0.34 MHz under saturation powers and single-photon purities of g^(2)(0)=0.11±0.02(CW)and g^(2)(0)=0.087±0.003(pulsed)at low excitation powers.A Purcell factor of 4.2 with a collection efficiency of 11.2%±1%at the first lens is extracted,suggesting efficient coupling between the QD and h-CBR.Our work contributes to the development of highly efficient single-photon sources in the telecom band for fiber-based quantum communication and future distributed quantum networks.

关 键 词：quantum CIRCULAR COUPLING 

分 类 号：O431.2[机械工程—光学工程] TN751.2[理学—光学]