Coincidence detection of single photons is crucial in numerous quantum technologies and usually requires multiple time-resolved single-photon detectors. However, the electronic readout becomes a major challenge when the measurement basis scales to large numbers of spatial modes. Here, we address this problem by introducing a two-terminal coincidence detector that enables scalable readout of an array of detector segments based on superconducting nanowire microstrip transmission line. Exploiting timing logic, we demonstrate a sixteen-element detector that resolves all 136 possible single-photon and two-photon coincidence events. We further explore the pulse shapes of the detector output and resolve up to four-photon events in a four-element device, giving the detector photon-number-resolving capability. This new detector architecture and operating scheme will be particularly useful for multi-photon coincidence detection in large-scale photonic integrated circuits.

单光子的重合检测在众多量子技术中至关重要，通常需要多个时间分辨的单光子探测器。但是，当测量基础扩展到大量空间模式时，电子读数将成为一项重大挑战。在这里，我们通过引入一个双端重合检测器解决了这个问题，该检测器能够基于超导纳米线微带传输线对检测器段阵列进行可扩展读出。利用时序逻辑，我们演示了一个十六元检测器，该检测器可解决所有136个可能的单光子和双光子重合事件。我们进一步探索探测器输出的脉冲形状，并在四元素设备中解决多达四个光子事件，从而提供探测器光子数解析能力。