It is used in the most accurate available measurements of the magnetic flux quantum Φ < sub > 0 </ sub > = h /( 2e ), where h is the Planck constant.

It is used in the most accurate available measurements of the magnetic flux quantum h / 2e, and thus ( coupled with the quantum Hall resistivity ) for Planck's constant h. Josephson was awarded the Nobel Prize in Physics for this work in 1973.

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