Direct demonstration of Heisenberg's uncertainty principle in a superconductor

@article{Elion1994DirectDO,
  title={Direct demonstration of Heisenberg's uncertainty principle in a superconductor},
  author={W. Elion and M. Matters and U. Geigenm{\"u}ller and J. Mooij},
  journal={Nature},
  year={1994},
  volume={371},
  pages={594-595}
}
A HEISENBERG uncertainty relation exists between any two non-commuting variables of a quantum-mechanical system. In a super-conductor, two such variables are the number, n, of Cooper pairs and the phase, φ, of the superconducting wavefunction. Suppress-ing fluctuations in either variable should lead to enhanced fluctua-tions in the other1,2. To demonstrate this effect, we have fabricated a structure in which the quantum-mechanical fluctuations in the phase of a superconducting grain can be… Expand

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