The actual purpose of this post is just to highlight some of the actual content of a really nice entry on the Magnetic flux quantum, [h/2e] which states:
The magnetic flux quantum may be measured with great precision by exploiting the Josephson effect. In fact, when coupled with the measurement of the von Klitzing constant RK = h/e2, this provides the most precise values of Planck's constant h obtained to date. This is remarkable since h is generally associated with the behavior of microscopically small systems, whereas the quantization of magnetic flux in a superconductor and the quantum Hall effect are both collective phenomena associated with thermodynamically large numbers of particles.This point is also stressed and discussed at length in Bob Laughlin's book A Different Universe which this blog contains many quotes from.
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