We demonstrate substantial power gain with a superconducting transition detector. Theoretically we describe the properties of the detector as a power amplifier. In our first experiments power gain of ~25 was reached, in good agreement with the theory. The gain facilitates noise matching of the readout circuit to the detectors in the case of cryogenic time-division multiplexing.
Helistö, P., Hassel, J., Luukanen, A., & Seppä, H. (2009). Superconducting transition detector in power amplification mode. Superconductor Science and Technology, 22(4), . https://doi.org/10.1088/0953-2048/22/4/045004