Traceable Coulomb blockade thermometry

O. Hahtela*, E. Mykkanen, A. Kemppinen, M. Meschke, M. Prunnila, D. Gunnarsson, L. Roschier, J. Penttila, J. Pekola

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)


We present a measurement and analysis scheme for determining traceable thermodynamic temperature at cryogenic temperatures using Coulomb blockade thermometry. The uncertainty of the electrical measurement is improved by utilizing two sampling digital voltmeters instead of the traditional lock-in technique. The remaining uncertainty is dominated by that of the numerical analysis of the measurement data. Two analysis methods are demonstrated: numerical fitting of the full conductance curve and measuring the height of the conductance dip. The complete uncertainty analysis shows that using either analysis method the relative combined standard uncertainty (k = 1) in determining the thermodynamic temperature in the temperature range from 20 mK to 200 mK is below 0.5%. In this temperature range, both analysis methods produced temperature estimates that deviated from 0.39% to 0.67% from the reference temperatures provided by a superconducting reference point device calibrated against the Provisional Low Temperature Scale of 2000.

Original languageEnglish
Article number69
Pages (from-to)69-76
Number of pages8
Issue number1
Publication statusPublished - Feb 2017
MoE publication typeA1 Journal article-refereed


  • Coulomb blockade thermometry
  • primary thermometer
  • traceability
  • thermodynamic temperature


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