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B. Mazin, P. Day, K. Irwin, C. Reintsema, J. Zmuidzinas (2006)
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Kinetic inductance detectors are based upon high Q superconducting resonators. We have measured the electrical Noise Equivalent Power (NEP) of 100 nm thick 1/4λ 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 ${}=9\times 10^{-18}\ \mbox{W}/\sqrt{\mathrm{Hz}}$ 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 ${}=3\times10^{-18}\ \mathrm{W}/\sqrt{\mathrm{Hz}}$ 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.
Journal of Low Temperature Physics – Springer Journals
Published: Jan 26, 2008
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