Fully integrated quantum photonic circuits show a clear advantage in terms of stability and scalability compared to tabletop implementations. They will constitute a fundamental breakthrough in integrated quantum technologies, as a matter of example, in quantum simulation and quantum computation. Despite the fact that only a few building blocks are strictly necessary, their simultaneous realization is highly challenging. This is especially true for the simultaneous implementation of all three key components on the same chip: single-photon sources, photonic logic, and single-photon detectors. Here, we present a fully integrated Hanbury-Brown and Twiss setup on a micrometer-sized footprint consisting of a GaAs waveguide embedding quantum dots as single-photon sources, a waveguide beamsplitter, and two superconducting nanowire single-photon detectors. This enables a second-order correlation measurement on the single-photon level under both continuous-wave and pulsed resonant excitation. The presented proof-of-principle experiment proves the simultaneous realization and operation of all three key building blocks and therefore a major step towards fully integrated quantum optical chips.

中文翻译：

---

单片半导体-超导体平台上的全片上单光子Hanbury-Brown和Twiss实验

与台式实现相比，完全集成的量子光子电路在稳定性和可扩展性方面显示出明显的优势。例如，它们将构成集成量子技术的根本突破，例如在量子模拟和量子计算中。尽管实际上仅需要几个构建基块，但同时实现它们却极具挑战性。对于在同一芯片上同时实现所有三个关键组件的情况尤其如此：单光子源，光子逻辑和单光子检测器。在这里，我们介绍了一种完全集成的Hanbury-Brown和Twiss装置，其尺寸为微米级，由嵌入量子点作为单光子源的GaAs波导，波导分束器和两个超导纳米线单光子探测器组成。这使得在连续波和脉冲谐振激发下都能够在单光子能级上进行二阶相关测量。提出的原理验证实验证明了这三个关键构建模块的同时实现和操作，因此是向完全集成的量子光学芯片迈出的重要一步。