Yonezu Yuya, Wakui Kentaro, Furusawa Kentaro, Takeoka Masahiro, Semba Kouichi, Aoki Takao
Department of Applied Physics, Waseda University, Okubo 3-4-1, Shinjuku, Tokyo, Japan.
National Institute of Information and Communications Technology (NICT), Nukui-kita 4-2-1, Koganei, Tokyo, Japan.
Sci Rep. 2017 Oct 11;7(1):12985. doi: 10.1038/s41598-017-13309-z.
Nitrogen-Vacancy (NV) centers in diamond are promising solid-state quantum emitters that can be utilized for photonic quantum applications. Various diamond nanophotonic devices have been fabricated for efficient extraction of single photons emitted from NV centers to a single guided mode. However, for constructing scalable quantum networks, further efficient coupling of single photons to a guided mode of a single-mode fiber (SMF) is indispensable and a difficult challenge. Here, we propose a novel efficient hybrid system between an optical nanofiber and a cylindrical-structured diamond nanowire. The maximum coupling efficiency as high as 75% for the sum of both fiber ends is obtained by numerical simulations. The proposed hybrid system will provide a simple and efficient interface between solid-state quantum emitters and a SMF suitable for constructing scalable quantum networks.
金刚石中的氮空位（NV）中心是很有前景的固态量子发射体，可用于光子量子应用。已经制造了各种金刚石纳米光子器件，以有效地将NV中心发射的单光子提取到单一的导模中。然而，对于构建可扩展的量子网络而言，将单光子进一步有效地耦合到单模光纤（SMF）的导模中是必不可少的，也是一项艰巨的挑战。在此，我们提出了一种光学纳米纤维与圆柱形结构金刚石纳米线之间的新型高效混合系统。通过数值模拟，两个光纤端的总和获得了高达75%的最大耦合效率。所提出的混合系统将在固态量子发射体和适合构建可扩展量子网络的单模光纤之间提供一个简单而高效的接口。
