Preprint article · Journal article
Development of a Josephson vortex two-state system based on a confocal annular Josephson junction
We report theoretical and experimental work on the development of a Josephson vortex two-state system based on a confocal annular Josephson tunnel junction (CAJTJ). The key ingredient of this geometrical configuration is a periodically variable width that generates a spatial vortex potential with bistable states.
This intrinsic vortex potential can be tuned by an externally applied magnetic field and tilted by a bias current. The two-state system is accurately modeled by a one-dimensional sine-Gordon like equation by means of which one can numerically calculate both the magnetic field needed to set the vortex in a given state as well as the vortex-depinning currents.
Experimental data taken at on high-quality Nb/Al–AlOx/Nb CAJTJs with an individual trapped fluxon advocate the presence of a robust and finely tunable double-well potential for which reliable manipulation of the vortex state has been classically demonstrated. The vortex is prepared in a given potential by means of an externally applied magnetic field, while the state readout is accomplished by measuring the vortex-depinning current in a small magnetic field.
Our proof of principle experiment convincingly demonstrates that the proposed vortex two-state system based on CAJTJs is robust and workable.
Language: | English |
---|---|
Year: | 2018 |
Pages: | 025003 |
ISSN: | 13616668 and 09532048 |
Types: | Preprint article and Journal article |
DOI: | 10.1088/1361-6668/aa9e17 |
ORCIDs: | Mygind, Jesper and 0000-0002-8913-7112 |