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Confocal Annular Josephson Tunnel Junctions with Large Eccentricity

Authors :: Roberto Monaco
Lyudmila V. Filippenko
Jesper Mygind
Source :: Monaco, R, Mygind, J & Filippenko, L V 2018, ' Confocal Annular Josephson Tunnel Junctions with Large Eccentricity ', Journal of Low Temperature Physics, vol. 192, no. 5-6, pp. 315-329 . https://doi.org/10.1007/s10909-018-1977-1, Journal of low temperature physics 192 (2018): 1–15. doi:10.1007/s10909-018-1977-1, info:cnr-pdr/source/autori:Roberto Monaco, Jesper Mygind and Lyudmila V. Filippenko/titolo:Confocal Annular Josephson Tunnel Junctions with Large Eccentricity/doi:10.1007%2Fs10909-018-1977-1/rivista:Journal of low temperature physics/anno:2018/pagina_da:1/pagina_a:15/intervallo_pagine:1–15/volume:192
Publication Year :: 2018
Publisher :: Springer Science and Business Media LLC, 2018.
Abstract: Confocal Annular Josephson Tunnel Junctions (CAJTJs) which are the natural generalization of the circular annular Josephson tunnel junctions, have a rich nonlinear phenomenology due to the intrinsic non-uniformity of their planar tunnel barrier delimited by two closely spaced confocal ellipses. In the presence of a uniform magnetic field in the barrier plane, the periodically changing width of the elliptical annulus generates a asymmetric double-well for a Josephson vortex trapped in a long and narrow CAJTJ. The preparation and readout of the vortex pinned in one of the two potential minima, which are important for the possible realization of a vortex qubit, have been numerically and experimentally investigated for CAJTJs with the moderate aspect ratio 2:1. In this work we focus on the impact of the annulus eccentricity on the properties of the vortex potential profile and study the depinning mechanism of a fluxon in more eccentric samples with aspect ratio 4:1. We also discuss the effects of the temperature-dependent losses as well as the influence of the current and magnetic noise.<br />Comment: arXiv admin note: text overlap with arXiv:1707.01672