Anomalous Dissipation in Current Biased Josephson Systems
- URL: http://arxiv.org/abs/2607.11647v1
- Date: Mon, 13 Jul 2026 15:01:26 GMT
- Title: Anomalous Dissipation in Current Biased Josephson Systems
- Abstract summary: A new phase diffusive regime in a current biased Josephson junction is theoretically explored.<n>This is realized by placing parallel to the junction a resistor in series with a capacitor such that electromagnetic fluctuations effectively couple also to the charge of the junction.
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- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: A new phase diffusive regime in a current biased Josephson junction is theoretically explored which originates from embedding the junction in a circuit environment with anomalous dissipation. This is realized by placing parallel to the junction a resistor in series with a capacitor such that electromagnetic fluctuations effectively couple also to the charge of the junction. This leads to rich Josephson dynamics, in particular for the switching of the junction out of a zero voltage state. Modelled as the escape process of a fictitious phase-particle out of a metastable well, a detailed study reveals that anomalous dissipation has a strong impact at low temperatures when quantum tunneling dominates against thermal activation. As a manifestation, a regime is found, where for realistic circuit parameters the quantum escape process is substantially enhanced, followed by a short voltage pulse and re-trapping with high probability. This class of circuits may be leveraged for detecting microwave photons or dissipative quantum annealing processes. In addition, the analysis provides a general framework for engineering dissipative dynamics in nonlinear systems using anomalous environments.
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