A nanodiamond embedding a single nitrogen-vacancy (NV) center has outstanding optical properties since it is readily manipulated and coupled with nanophotonic devices. Reliable methods to identify the orientation of an NV axis on photonic platforms are important to precisely estimate the coupling efficiency between them. We report on a method to identify the orientation of an NV axis. The proposed method consists of a single dataset of optically detected magnetic resonance (ODMR) measurements taken while rotating the magnetic field in a plane and a single ODMR measurement taken while applying the magnetic field in a single direction. By applying this method to a nanodiamond with a single NV center on a microscope coverslip, the orientation of the NV center is determined to be ( θ NV , ϕ NV ) = ( 144.6 ° , 52.9 ° ) when the magnetic field is scanned in the xy-plane. When the magnetic field is scanned in the xz-plane, it is determined to be ( θ NV , ϕ NV ) = ( 148.0 ° , 45.7 ° ) which is consistent within 5.2°. This technique will advance progress toward realizing photon-based quantum networks and quantum communication.

中文翻译：

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使用三维控制磁场识别纳米金刚石中单个 NV 中心的取向

嵌入单个氮空位 (NV) 中心的纳米金刚石具有出色的光学特性，因为它易于操纵并与纳米光子器件耦合。确定光子平台上 NV 轴方向的可靠方法对于精确估计它们之间的耦合效率非常重要。我们报告了一种确定 NV 轴方向的方法。所提出的方法包括在平面中旋转磁场时进行的光学检测磁共振 (ODMR) 测量的单个数据集和在单个方向上施加磁场时进行的单个 ODMR 测量。通过将此方法应用于显微镜盖玻片上具有单个 NV 中心的纳米金刚石，确定 NV 中心的方向为 ( θ NV , ϕ NV ) = ( 144.6 ° , 52. 9 ° ) 在 xy 平面中扫描磁场时。在xz平面扫描磁场时，确定为( θ NV , ϕ NV ) = ( 148.0° , 45.7° )，在5.2°范围内是一致的。这项技术将推动实现基于光子的量子网络和量子通信的进展。