Frequency combs, specialized laser sources emitting multiple equidistant frequency lines, have revolutionized science and technology with unprecedented precision and versatility. Recently, integrated frequency combs are emerging as scalable solutions for on-chip photonics. Here, we demonstrate a fully integrated superconducting microcomb that is easy to manufacture, simple to operate, and consumes ultra-low power. Our turnkey apparatus comprises a basic nonlinear superconducting device, a Josephson junction, directly coupled to a superconducting microstrip resonator. We showcase coherent comb generation through self-started mode-locking. Therefore, comb emission is initiated solely by activating a DC bias source, with power consumption as low as tens of picowatts. The resulting comb spectrum resides in the microwave domain and spans multiple octaves. The linewidths of all comb lines can be narrowed down to 1 Hz through a unique coherent injection-locking technique. Our work represents a critical step towards fully integrated microwave photonics and offers the potential for integrated quantum processors.

频率梳是发射多条等距频率线的专用激光源，以前所未有的精度和多功能性彻底改变了科学技术。最近，集成频率梳正在成为片上光子学的可扩展解决方案。在这里，我们展示了一种完全集成的超导微梳，它易于制造、操作简单且功耗超低。我们的交钥匙设备包括一个基本的非线性超导装置，一个约瑟夫森结，直接耦合到超导微带谐振器。我们通过自启动锁模展示了相干梳状生成。因此，只需激活直流偏置源即可启动梳状发射，功耗低至数十皮瓦。所得的梳状频谱位于微波域并跨越多个倍频程。通过独特的相干注入锁定技术，所有梳状线的线宽均可缩小至 1 Hz。我们的工作代表了迈向完全集成微波光子学的关键一步，并为集成量子处理器提供了潜力。