Sources of quantum light, in particular correlated photon pairs that are indistinguishable for all degrees of freedom, are the fundamental resource for photonic quantum computation and simulation. Although such sources have been recently realized using integrated photonics, they offer limited ability to tune the spectral and temporal correlations between generated photons because they rely on a single component, such as a ring resonator. Here, we demonstrate a tunable source of indistinguishable photon pairs using dual-pump spontaneous four-wave mixing in a topological system comprising a two-dimensional array of resonators. We exploit the linear dispersion of the topological edge states to tune the spectral bandwidth (by about 3.5×), and thereby, to tune quantum interference between generated photons by tuning the two pump frequencies. We demonstrate energy−time entanglement and, using numerical simulations, confirm the topological robustness of our source. Our results could lead to tunable, frequency-multiplexed quantum light sources for photonic quantum technologies.

量子光源，特别是对于所有自由度都无法区分的相关光子对，是光子量子计算和模拟的基本资源。尽管最近已使用集成光子学实现了此类源，但它们提供的调节生成光子之间的光谱和时间相关性的能力有限，因为它们依赖于单个组件，例如环形谐振器。在这里，我们展示了在包含二维谐振器阵列的拓扑系统中使用双泵自发四波混合的不可区分光子对的可调源。我们利用拓扑边缘状态的线性色散来调整光谱带宽（约 3.5 倍），从而通过调整两个泵浦频率来调整产生的光子之间的量子干涉。我们展示了能量-时间纠缠，并使用数值模拟证实了我们的源的拓扑稳健性。我们的结果可能会导致用于光子量子技术的可调谐、频率复用的量子光源。