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SFQ Parallel Encoders Promising for Video Imaging With Superconductor Stripline Detectors

2021    Tanaka, Masamitsu; Kozaka, Misaki; Kamiya, Kyohei; Usenmez, Kubra; Aydogan, Eren Can; Razmkhah, Sasan; Bozbey, Ali; Fujimaki, Akira

We report demonstration of a readout circuit with high-throughput single flux quantum (SFQ) based encoders for a large-scale video imaging system with a conventional frame rate. The encoders are fully parallel and integrated on the same chip as linear arrays of serially connected superconductor stripline detectors (SSLDs), superconducting quantum interference device (SQUID) based comparators, and SFQ synchronizers. Mutual coupling of parallel SSLDs and SQUID-based comparators allows the use of only one dc bias line; it is possible to use thousands of SSLDs without increasing the bias current or number of bias ports. To achieve crosstalk-free readout, the serially connected SSLDs are separated by low-pass filters or large inductors. We experimentally demonstrated crosstalk-free readout including SFQ parallel encoders from 1-D or 2-D serially connected SSLD arrays.