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Noise and Sensitivity of Aluminum Kinetic Inductance Detectors for Sub-mm Astronomy

Noise and Sensitivity of Aluminum Kinetic Inductance Detectors for Sub-mm Astronomy 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Low Temperature Physics Springer Journals

Noise and Sensitivity of Aluminum Kinetic Inductance Detectors for Sub-mm Astronomy

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References (12)

Publisher
Springer Journals
Copyright
Copyright © 2008 by Springer Science+Business Media, LLC
Subject
Physics; Condensed Matter Physics; Characterization and Evaluation of Materials; Magnetism, Magnetic Materials
ISSN
0022-2291
eISSN
1573-7357
DOI
10.1007/s10909-007-9684-3
Publisher site
See Article on Publisher Site

Abstract

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

Journal of Low Temperature PhysicsSpringer Journals

Published: Jan 26, 2008

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