Current status of the quantum metrology triangle

  title={Current status of the quantum metrology triangle},
  author={Mark W. Keller},
  pages={102 - 109}
  • M. Keller
  • Published 18 January 2008
  • Physics
  • Metrologia
The quantum metrology triangle is a test of the consistency of three quantum electrical standards: the single-electron tunnelling current standard, the Josephson voltage standard and the quantum Hall resistance standard. This paper considers what is known about each of these effects separately in terms of (1) theory, (2) empirical tests of universality and (3) ‘direct’ tests involving fundamental constants. The current status of each of the three ‘legs’ of the triangle is quite different, with… 

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