Fiber-Coupled Diamond Micro-Waveguides toward an Efficient Quantum Interface for Spin Defect Centers
Fiber-Coupled Diamond Micro-Waveguides toward an Efficient Quantum Interface for Spin Defect Centers
复制标题
DOI：
10.1021/acsomega.7b01223
复制
发表时间：
2017-10-01
期刊：
影响因子：
4.1
通讯作者：
Benson, Oliver
中科院分区：
文献类型：
--
作者：
Fujiwara, Masazumi;Neitzke, Oliver;Benson, Oliver
我们报道了在低温下，金刚石纳米光子结构中的氮空位(NV)色心直接集成和高效耦合到基于光纤的光子结构中。NV中心被嵌入到耦合到光纤锥的钻石微波导(Mu WG)中。光纤锥可以低损耗地连接到单模光纤，因此可以有效地将NV中心集成到光纤网络中。数值优化了专门用于低温实验的MUWG光纤锥化装置的参数，获得了35.6%的耦合效率，并在不损失光纤传输的情况下，实验证明了这些装置可以冷却到4.2K的液氦温度。在100K下，我们观察到NV中心通过尾纤的荧光中锐利的零声子线。具有高光子耦合效率的优化器件和冷却到低温的演示是利用金刚石自旋缺陷中心实现光纤基量子纳米光子界面的重要步骤。
We report the direct integration and efficient coupling of nitrogen vacancy (NV) color centers in diamond nanophotonic structures into a fiber-based photonic architecture at cryogenic temperatures. NV centers are embedded in diamond micro-waveguides (mu WGs), which are coupled to fiber tapers. Fiber tapers have low-loss connection to singlemode optical fibers and hence enable efficient integration of NV centers into optical fiber networks. We numerically optimize the parameters of the mu WG-fiber-taper devices designed particularly for use in cryogenic experiments, resulting in 35.6% coupling efficiency, and experimentally demonstrate cooling of these devices to the liquid helium temperature of 4.2 K without loss of the fiber transmission. We observe sharp zero-phonon lines in the fluorescence of NV centers through the pigtailed fibers at 100 K. The optimized devices with high photon coupling efficiency and the demonstration of cooling to cryogenic temperatures are an important step to realize fiber-based quantum nanophotonic interfaces using diamond spin defect centers.