Abstract
We present a MgB(2)-based Microwave Kinetic Inductance Detector (MKID) featuring a quality factor Q(i) ~ 10(5) and noise equivalent power NEP ~ 10(-14) W/Hz at 2 K. In comparison to YBCO-based MKIDs, the MgB(2) detector shows greater sensitivity to both temperature and magnetic field, a result of its two-gap nature and relatively low critical Hc2 field. Our data indicate that MgB(2) is more advantageous for MKID applications at temperatures lower than 3 K.