Highly-sensitive broadly-tunable detectors are needed for future multi-domain sensing and quantum-information systems. Layered graphene with “magic” twist-angle between 2 - 4 sheets is superconducting below 2 K. Demonstrated Josephson junctions in this material feature very high dynamic resistance at the maximum zero-voltage current. Biased at this current, a small microwave voltage across the junction shifts the voltage-current step, which results in a large DC output voltage. A suitable antenna driven by external radiation can source the desired AC voltage across the junction. As a non-thermal mechanism, such detectors may in principle be fast, as well as sensitive. Additionally, there is a bolometric response, whose temperature coefficient of resistance we estimate to be 300%/K. Design, fabrication, response, and twist-angle tolerance for antenna-coupled, superconducting-graphene, Josephson-junction detectors of mm-wave and THz radiation are discussed.
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