Spectrally multiplexed and bright entangled photon pairs in a lithium niobate microresonator

作     者：Bo-Yu Xu Li-Kun Chen Jin-Tian Lin Lan-Tian Feng Rui Niu Zhi-Yuan Zhou Ren-Hong Gao Chun-Hua Dong Guang-Can Guo Qi-Huang Gong Ya Cheng Yun-Feng Xiao Xi-Feng Ren 

作者机构：CAS Key Laboratory of Quantum InformationUniversity of Science and Technology of ChinaHefei 230026China State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronicsSchool of PhysicsPeking UniversityBeijing 100871China State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser ScienceShanghai Institute of Optics and Fine Mechanics(SIOM)Chinese Academy of Sciences(CAS)Shanghai 201800China CAS Synergetic Innovation Center of Quantum Information&Quantum PhysicsUniversity of Science and Technology of ChinaHefei 230026China State Key Laboratory of Precision SpectroscopyEast China Normal UniversityShanghai 200062China Collaborative Innovation Center of Extreme OpticsShanxi UniversityTaiyuan 030006China 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2022年第65卷第9期

页      面：3-9页

核心收录：

学科分类：081702[工学-化学工艺] 070207[理学-光学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：supported by the National Key R&D Program of China(Grant Nos.2016YFA0301302,and 2016YFA0301700) National Natural Science Foundation of China(Grant Nos.11825402,61590932,11774333,62061160487,12004373,11734009,and 11874375) Anhui Initiative in Quantum Information Technologies(Grant No.AHY130300) Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB24030601) Beijing Academy of Quantum Information Sciences(Grant No.Y18G20) Fundamental Research Funds for the Central Universities partially carried out at the USTC Center for Micro and Nanoscale Research and Fabrication 

主　　题：quantum entangled source spectral multiplexing lithium niobate on insulator microresonator 

摘      要：On-chip bright quantum sources with multiplexing ability are extremely high in demand for integrated quantum networks with unprecedented scalability and ***,we demonstrate a bright and broadband biphoton quantum source with spectral multiplexing generated in a lithium niobate microresonator *** introducing the conventional domain poling,the on-chip microdisk produces photon pairs covering a broad bandwidth promised by natural phase matching in spontaneous parametric down ***,the multiplexed photon pairs are characterized by 30 nm bandwidth limited by the filtering system,providing over 40 multiplexing channels with a 0.8 nm channel ***,the generation rate reaches 5.13 MHz/μW with a coincidence-to-accidental ratio up to 804,and the quantum source manifests a high purity with a heralded single photon correlation g^((2))_(H)(0)=0.0098±***,the energy-time entanglement is demonstrated with an excellent interference visibility of 96.5%±2%.Such a quantum source at the telecommunication band paves the way for high-dimensional entanglement and future integrated quantum information systems.