期刊
JOURNAL OF LOW TEMPERATURE PHYSICS
卷 151, 期 1-2, 页码 524-529出版社
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10909-007-9684-3
关键词
sub-mm detectors; kinetic inductance
Kinetic inductance detectors are based upon high Q superconducting resonators. We have measured the electrical Noise Equivalent Power (NEP) of 100 nm thick 1/4 lambda coplanar waveguide Aluminum resonators at 100 mK using phase readout and radius readout. We find that the phase NEP is independent of the Q factor of the resonator, limited by excess noise in the KID and given by NEP = 9 x 10(-18) W/root Hz at 100 Hz. It increases with roughly f(-0.5) at lower frequencies. The amplitude NEP is strongly Q factor dependent, limited by the setup noise, nearly frequency independent and as low as NEP = 3 x 10(-18) W/root Hz for a high Q resonator (Q = 454.000). For lower Q resonators the amplitude NEP increases to values equal to or even larger than the phase readout.
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