Reduced quantum fluctuations in the Josephson junction

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Abstract
We predict that a Josephson junction can exhibit, under certain conditions, squeezed or reduced quantum fluctuations of the tunneling current. Using the formal analogy of the Josephson junction to a system of two-level atoms, we show that these reduced fluctuations are closely related to the Bloch-state description of the Bardeen-Cooper-Schrieffer wave function and to the angular-momentum algebra of the proper dynamical variables describing the tunneling process.