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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 and potentialtechnological applications. These two complementary effects are shown to beclearly distinguishable from the associated noise spectra. The current noise isdetermined exactly and a rather sharp crossover between flux noise in the MQTand charge noise in the CB regions is found as the applied voltage is changed.Related results hold for the voltage noise in current-biased junctions.Comment: 6 pages, 3 figures, epl.cls include

Identification of Coulomb blockade and macroscopic quantum tunneling by noise