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Proceedings Paper

Power dependence of phase noise in microwave kinetic inductance detectors
Author(s): Jiansong Gao; Benjamin Mazin; Miguel Daal; Peter Day; Henry LeDuc; Jonas Zmuidzinas
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Paper Abstract

Excess phase noise has been observed in microwave kinetic inductance detectors (MKIDs) which prevents the noise-equivalent power (NEP) of current detectors from reaching theoretical limits. One characteristic of this excess noise is its dependence on the power of the readout signal: the phase noise decreases as the readout power increases. We investigated this power dependence in a variety of devices, varying the substrate (silicon and sapphire), superconductor (aluminum and niobium) and resonator parameters (resonant frequency, quality factor and resonator geometry). We find that the phase noise has a power law dependence on the readout power, and that the exponent is -1/2 in all our devices. We suggest that this phase noise is caused by coupling between the high-Q microwave resonator that forms the sensitive element of the MKID and two-level systems associated with disorder in the dielectric material of the resonator. The physical situation is analogous to the resonance fluorescence in quantum optics, and we are investigating the application of resonance fluorescence theory to MKID phase noise.

Paper Details

Date Published: 27 June 2006
PDF: 8 pages
Proc. SPIE 6275, Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III, 627509 (27 June 2006); doi: 10.1117/12.672590
Show Author Affiliations
Jiansong Gao, California Institute of Technology (United States)
Benjamin Mazin, Jet Propulsion Lab. (United States)
Miguel Daal, Univ. of California at Berkeley (United States)
Peter Day, Jet Propulsion Lab. (United States)
Henry LeDuc, Jet Propulsion Lab. (United States)
Jonas Zmuidzinas, California Institute of Technology (United States)

Published in SPIE Proceedings Vol. 6275:
Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III
Jonas Zmuidzinas; Wayne S. Holland; Stafford Withington; William D. Duncan, Editor(s)

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