Large-scale qubit readout in quantum computing

systems requires highly sensitive amplification with minimal

power consumption to reduce thermal load and preserve qubit

integrity. We propose a pulse-operated cryogenic low-noise am-

plifier (LNA) scheme that minimizes the influence from the LNA

on qubit operation and reduces power consumption by duty

cycling. A modified commercially available cryogenic hybrid LNA

based on InP HEMTs has been characterized to demonstrate the