Abstract
Handel introduced the notion that ultralow-frequency noise for normal electrons (in Brownian motion) arises from Bloch-Nordsieck soft-photon emission. Using instantons, previously shown to arise in the quantum sine-Gordon field theory of an extended Josephson junction capacitor, we show here that copious soft-photon emission exists at the one-loop level of quantum electrodynamics. This gives rise to noise of the form (1/..omega..)/sup() 1-beta/ in small Josephson junctions.
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