Future scalable photonic quantum information processing relies on the ability of integrating multiple interacting quantum emitters into a single chip. Quantum dots provide ideal on-chip quantum light sources. However, achieving quantum interaction between multiple quantum dots on-a-chip is a challenging task due to the randomness in their frequency and position, requiring local tuning technique and long-range quantum interaction. Here, we demonstrate quantum interactions between separated two quantum dots on a nanophotonic waveguide. We achieve a photon-mediated long-range interaction by integrating the quantum dots to the same optical mode of a nanophotonic waveguide and overcome spectral mismatch by incorporating on-chip thermal tuners. We observe their quantum interactions of the form of super-radiant emission, where the two dots collectively emit faster than each dot individually. Creating super-radiant emission from integrated quantum emitters could enable compact chip-integrated photonic structures that exhibit long-range quantum interactions. Therefore, these results represent a major step toward establishing photonic quantum information processors composed of multiple interacting quantum emitters on a semiconductor chip.

中文翻译：

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纳米光子波导中量子点的超辐射发射

未来可扩展的光子量子信息处理依赖于将多个相互作用的量子发射器集成到单个芯片中的能力。量子点提供了理想的片上量子光源。然而，由于其频率和位置的随机性，需要在芯片上实现多个量子点之间的量子相互作用，这是一项具有挑战性的任务，需要局部调谐技术和远程量子相互作用。在这里，我们演示了纳米光子波导上分离的两个量子点之间的量子相互作用。我们通过将量子点集成到纳米光子波导的相同光学模式中来实现光子介导的远程相互作用，并通过并入芯片上的热调谐器来克服光谱失配。我们观察到它们以超辐射发射的形式发生量子相互作用，其中两个点的总和比每个点的总和要快。从集成的量子发射器产生超辐射发射可以实现紧凑的芯片集成的光子结构，从而展现出长距离的量子相互作用。因此，这些结果代表了朝着在半导体芯片上建立由多个相互作用的量子发射器组成的光子量子信息处理器迈出的重要一步。