Integrated superconducting nanobridge fast readout electronics for single photon detector arrays

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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