Abstract
The effects of Macroscopic Quantum Tunneling (MQT) and Coulomb Blockade (CB)in Josephson junctions are of considerable significance both for themanifestations of quantum mechanics on the macroscopic scale andpotential technological applications. These two complementary effects areshown to be clearly distinguishable from the associated noise spectra.The current noise is determined exactly and a rather sharp crossoverbetween flux noise in the MQT and charge noise in the CB regions is foundas the applied voltage is changed. Related results hold for the voltage noisein current-biased junctions.
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