Superconducting transition detector in power amplification mode: a tool   for cryogenic multiplexing
  We demonstrate that substantial power gain can be obtained with superconducting transition detectors. We describe the properties of the detector as a power amplifier theoretically. In our first experiments power gain of 23 was reached in a good agreement with the theory. The gain facilitates noise matching of the readout circuit to the detectors in the case of time division multiplexing. 
P. Helist\"o, J. Hassel, A. Luukanen, H. Sepp\"a