Quantum photonics is a rapidly developing platform for future quantum network applications. Waveguide-based architectures, in which embedded quantum emitters act as both nonlinear elements to mediate photon–photon interactions and as highly coherent single-photon sources, offer a highly promising route to realize such networks. A key requirement for the scale-up of the waveguide architecture is local control and tunability of individual quantum emitters. Here, we demonstrate electrical control, tuning, and switching of the nonlinear photon–photon interaction arising due to a quantum dot embedded in a single-mode nano-photonic waveguide. A power-dependent waveguide transmission extinction as large as $40\pm 2\%$ is observed on resonance. Photon statistics measurements show clear, voltage-controlled bunching of the transmitted light and antibunching of the reflected light, demonstrating the single-photon, quantum character of the nonlinearity. Importantly, the same architecture is also shown to act as a source of highly coherent, electrically tunable single photons. Overall, the platform presented addresses the essential requirements for the implementation of photonic gates for scalable nano-photonic-based quantum information processing.

中文翻译：

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纳米光子波导中非线性量子光学的电控制

量子光子学是面向未来量子网络应用的快速发展的平台。基于波导的架构，其中嵌入式量子发射器既充当调解光子与光子相互作用的非线性元素，又充当高度相干的单光子源，为实现此类网络提供了极有希望的途径。扩大波导架构的关键要求是局部控制和单个量子发射器的可调性。在这里，我们演示了由于嵌入单模纳米光子波导中的量子点而引起的非线性光子-光子相互作用的电控制，调谐和切换。与功率有关的波导传输消光$40\pm \mathrm{2个}％$在共振时观察到。光子统计量测量显示了透射光的清晰，电压控制的聚束和反射光的反聚束，证明了非线性的单光子量子特征。重要的是，同样的体系结构也被证明是高度相干的，电可调谐的单光子的来源。总体而言，展示的平台满足了实现可扩展的基于纳米光子的量子信息处理的光子门的基本要求。