Magnetic Flux Noise in dc SQUIDs: Temperature and Geometry Dependence

Abstract

The spectral density S sub Phi(f) A sq/(f/1 Hz) alpha of magnetic flux noise in ten dc superconducting quantum interference devices (SQUIDs) with systematically varied geometries shows that alpha increases as the temperature is lowered; in so doing, each spectrum pivots about a nearly constant frequency. The mean-square flux noise, inferred by integrating the power spectra, grows rapidly with temperature and at a given temperature is approximately independent of the outer dimension of a given SQUID. These results are incompatible with a model based on the random reversal of independent, surface spins.

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Document Details

Document Type
Technical Report
Publication Date
Apr 05, 2013
Accession Number
ADA609043

Entities

People

  • Danielle Braje
  • G. C. Hilton
  • G. Fitch
  • H. Cho
  • J. S. Birenbaum
  • K. D. Irwin
  • M. Neeley
  • S. M. Anton
  • S. R. O'kelley
  • Vladimir Bolkhovsky

Organizations

  • University of California, Berkeley

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • California
  • Data Acquisition
  • Frequency
  • Geometry
  • Intelligence Community (United States)
  • Magnetic Fields
  • Magnetic Flux
  • Magnetic Moments
  • Magnetometers
  • Measurement
  • Power Spectra
  • Quantum Bits
  • Spectra
  • United States
  • United States Government
  • Universities
  • White Noise

Fields of Study

  • Physics

Readers

  • Analytical Mechanics
  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Superconducting Magnet Technology

Technology Areas

  • AI & ML
  • Quantum Computing
  • Quantum Science - Quantum Dots