Integrated superconducting nanobridge fast readout electronics for single photon detector arrays

我们的目标是开发纳米桥约瑟夫森结超导电路(基于单通量量子(SFQ)设计)，用于对来自单光子探测器阵列(特别是超导单光子探测器阵列)的信号进行高带宽、低噪声的数字信号处理(DSP)，并评估其商业适用性。SSPD阵列具有许多应用：作为快速、高效、低噪声的量子密钥分发探测器，作为量子计算和增强量子成像的组成部分。SSPDarray系统商业化的主要障碍是缺乏合适的读出电子设备来处理大量信号，而不需要探测器冷级的大量热负荷。SFQ读出提供了一种低功耗解决方案，可在市面上销售的机械冷却系统中实现多个像素。用于SSPD阵列读出的纳米桥SFQ电路是传统隧道结SFQ电路的一种新的、未被证实的替代方案，具有主要单层制造、较小的器件尺寸和与SSPD阵列集成在同一芯片上的潜力

Our objective is to develop nanobridge Josephson junction superconducting circuits (based on single flux quantum (SFQ)design) for high bandwidth, low noise digital signal processing (DSP) of signals from single photon detector arrays (inparticular SSPD (superconducting single photon detector) arrays) and assess their suitability for commercialisation.SSPD arrays have many applications; as a fast, high efficiency, low noise detector for quantum key distribution, as acomponent in quantum computing and for enhanced quantum imaging. The major hurdle to commercialisation of SSPDarray systems is the lack of suitable readout electronics able to process a large number of signals without significant heatloading of the detector cold stage. SFQ readout offers a low power solution, enabling multiple pixels in a marketable,mechanically cooled system. Nanobridge SFQ circuits for SSPD array readout are a new, undemonstrated alternative toconventional tunnel junction SFQ circuits, with the advantage of predominantly single layer fabrication, smaller device sizeand potential for integration on the same chip as the SSPD array