TITLE

Noise sources and dissipation mechanisms of a 120 h SQUID amplifier

AUTHOR(S)
Falferi, Paolo; Bonaldi, Michele; Cavalleri, Antonella; Cerdonio, Massimo; Vinante, Andrea; Mezzena, Renato; Xu, Ke-xi; Prodi, Giovanni Andrea; Vitale, Stefano
PUB. DATE
February 2003
SOURCE
Applied Physics Letters;2/10/2003, Vol. 82 Issue 6, p931
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A two-stage superconducting quantum interference device (SQUID), based on a commercial sensor, is strongly coupled to an electrical resonator at 11 kHz with a quality factor Q = 600 000 and operated in the temperature range 1.33-4.17 K. From the analysis of the noise generated by this system, the back action noise of the SQUID amplifier is estimated. The minimum noise temperature, calculated from back action and additive noise measurements, is 63 μK at 1.33 K, and corresponds to 120 times the quantum-limited noise temperature. We discuss and experimentally verify a mechanism, which can limit the noise temperature and add losses to the system.
ACCESSION #
9036491

 

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