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The effect of environmental coupling on tunneling of quasiparticles in Josephson junctions

Ansari, Mohammad H and Wilhelm, Frank K and Sinha, Urbasi and Sinha, Aninda (2013) The effect of environmental coupling on tunneling of quasiparticles in Josephson junctions. In: Superconductor Science and Technology, 26 (12). 125013_1-125013_8.

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Official URL: http://dx.doi.org/10.1088/0953-2048/26/12/125013


We study quasiparticle tunneling in Josephson tunnel junctions embedded in an electromagnetic environment. We identify tunneling processes that transfer electrical charge and couple to the environment in a way similar to that of normal electrons, and processes that mix electrons and holes and are thus creating charge superpositions. The latter are sensitive to the phase difference between the superconductors and are thus limited by phase diffusion even at zero temperature. We show that the environmental coupling is suppressed in many environments, thus leading to lower quasiparticle decay rates and better superconductor qubit coherence than previously expected. Our approach is nonperturbative in the environmental coupling strength.

Item Type: Journal Article
Publication: Superconductor Science and Technology
Publisher: IOP Publishing Ltd
Additional Information: Copyright of this article belongs to IOP Publishing Ltd.
Department/Centre: Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited: 20 Jan 2014 08:18
Last Modified: 20 Jan 2014 08:18
URI: http://eprints.iisc.ac.in/id/eprint/48056

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