Quantum technologies based on photons are anticipated in the areas of information processing, communication, metrology, and lithography. While there have been impressive proof-of-principle demonstrations in all of these areas, future technologies will likely require an integrated optics architecture for improved performance, miniaturization and scalability. We demonstrated high- fidelity silica-on-silicon integrated optical realizations of key quantum photonic circuits, including two-photon quantum interference with a visibility of 94.8(5)%; a controlled-NOT gate with logical basis fidelity of 94.3(2)%; and a path entangled state of two photons with fidelity >92%.
A Platform for Evanescently Trapping Rb-87 Using Silicon Nitride Strip Waveguides Buried in Silica
University of Bristol（布里斯托大学）；Quantum Engineering Technology Labs, H.H. Wills Physics Laboratory and School of Electrical, Electronic, & Mechanical Engineering, University of Bristol（布里斯托大学量子工程技术实验室、H.H. 威尔斯物理实验室和电气、电子与机械工程学院）；Quantum Engineering Centre for Doctoral Training, University of Bristol（布里斯托大学量子工程博士培训中心）
Evaluation of graphene optical nonlinearity with photon-pair generation in graphene-on-silicon waveguides
我们通过对自发四波混频产生的光子对的符合测量来评估硅基石墨烯波导的非线性系数。我们观察到的时间相关的光子对从波导在各种转移布局的石墨烯片。使用耦合波方程对实验结果进行简单分析表明，原子级薄的石墨烯片将硅波导的非线性增强了10倍。结果表明，纯$χ^{(3)}$基石墨烯的有效非线性折射率为$10^{-13}$ m $^2$ /W量级，为石墨烯基非线性光学在片上纳米光子学中的应用提供了重要的启示.
