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High sensitivity gravitational wave antenna with parametric transducer readout.

A high-Q niobium resonant mass gravitational radiation antenna with a superconducting parametric transducer and noncontacting readout is shown to achieve a noise temperature of about 2 mK using a zero order predictor filter. The predicted intrinsic cold damping of a parametric transducer is confirmed, along with predicted backaction limits on the sensitivity. While the antenna has the highest intrinsic Q factor and lowest noise temperature ever observed in a full scale antenna, the possibility of further improvements is demonstrated.