用于高效高速量子网络节点的光纤腔-离子阱耦合系统的设计  

Design of a fiber cavity ion trap for a high-efficiency and highrate quantum network node

作　　者：鲍星宇 崔金明[1,2,3] 房鼎 陈蔚彬 王健 黄运锋 李传锋[1,2,3] 郭光灿[1,2,3] Xing-Yu Bao;Jin-Ming Cui;Ding Fang;Wei-Bin Chen;Jian Wang;Yun-Feng Huang;Chuan-Feng Li;Guang-Can Guo(CAS Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China;CAS Center for Excellence in Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China;Hefei National Laboratory,University of Science and Technology of China,Hefei 230088,China)

机构地区：[1]中国科学技术大学中国科学院量子信息重点实验室,安徽合肥230026 [2]中国科学技术大学中国科学院量子信息与量子科技创新研究院,安徽合肥230026 [3]合肥国家实验室,安徽合肥230088

出　　处：《中国科学技术大学学报》2023年第7期34-43,70,共11页JUSTC

基　　金：supported by the National Natural Science Foundation of China(11821404,11804330);the Key Research Program of Frontier Sciences,CAS(QYZDY-SSW-SLH003);the Science Foundation of the CAS(ZDRW-XH2019-1);the Fundamental Research Funds for the Central Universities(WK2470000026,WK2470000027,WK2470000028,WK2470000038);the Anhui Initiative in Quantum Information Technologies(AHY020100);the National Program for Support of Topnotch Young Professionals(BB2470000005).

摘　　要：本文的主要目的是设计新型的离子阱与光纤腔的耦合系统,此方案是通过制造一个在侧面和端面具有金属层的光纤腔实现。带有金属层的光纤腔可以传输光和电荷,同时,光纤端面的金属层可以屏蔽介质高反膜上的电荷。此系统旨在捕获单个^(138)Ba^(+)离子,并实现光纤腔与^(138)Ba^(+)离子493 nm荧光的耦合。为了有效地收集荧光光子,我们对整个系统进行理论分析,以实现各个部分的最佳耦合。光纤的腔长被设计为250μm,优化后的耦合参数为(g,κ,γ)/2π=(55,105,20)MHz。我们还通过分析振动、离子阱性能和热稳定性来提高系统的稳定性和可靠性。系统的核心部分是由热膨胀系数相近的材料构成,以提高热稳定性。系统还使用弹簧连接真空腔体,用于隔绝腔体内外的振动。我们从理论上分析制造该耦合系统的难点,并实验验证了部分关键技术。整个系统有望被扩展成一个复杂的量子网络,以实现量子计算和量子通信。The main purpose of this paper is to design a novel coupled system of an ion trap and a fiber cavity.This integrated solution is achieved by fabricating a fiber cavity with a metal mask on the side and end faces of the fiber.The fiber cavity with the metal mask can transmit light and electric charges,and the metal mask on the fiber end-face can shield electric charges on the dielectric high-reflection film.This system is designed to trap a single^(138)Ba^(+)and realize coupling of the fiber cavity to the fluorescence at a 493 nm wavelength of^(138)Ba^(+).To efficiently collect fluorescent photons,we perform a theoretical analysis of the overall system to achieve optimal coupling of each individual part.The cavity length is designed to be 250μm,and the optimized coupling parameters are(g,k,γ)/2π=(55,105,20)MHz.We also improve the stability and reliability of the system by analyzing the vibration,performance of the ion trap,and thermal stability.The core of the system is composed of materials with similar thermal expansion coefficients to improve thermal stability.The system uses spring connections to isolate vibrations inside and outside the vacuum chamber.We theoretically solve the difficulties of manufacturing the coupled system and have completed the experimental verification of some key technologies.The whole system is expected to be extended into a complex quantum network system to realize quantum computation and communication.

关 键 词：离子阱 量子网络 光纤腔 量子信息 量子光学 

分 类 号：O431.2[机械工程—光学工程]