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We study quantum tunneling in a biased double-well potential in the presence of Ohmic dissipation with a friction coefficient α>1. The tunneling rate out of the metastable well is calculated in real time as a function of the temperature T and bias energy ε. The $T=0$ result agrees with a droplet-model calculation in imaginary time. At low temperatures we find an enhancement to the $T=0$ rate varying as (Tε)².
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Fisher et al. (1985) studied this question.
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