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Condensed Matter > Superconductivity

arXiv:1707.01672 (cond-mat)
[Submitted on 6 Jul 2017]

Title:Josephson Vortex Qubit based on a Confocal Annular Josephson Junction

Authors:Roberto Monaco, Jesper Mygind, Valery P. Koshelets
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Abstract:We report theoretical and experimental work on the development of a Josephson vortex qubit 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 4.2K 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 qubit based on CAJTJs is robust and workable.
Comments: 20 pages, 11 figures
Subjects: Superconductivity (cond-mat.supr-con); Quantum Physics (quant-ph)
Cite as: arXiv:1707.01672 [cond-mat.supr-con]
  (or arXiv:1707.01672v1 [cond-mat.supr-con] for this version)
  https://doi.org/10.48550/arXiv.1707.01672
Journal reference: Superconductor Science and Technology, Volume 31, Number 2, 2017
Related DOI: https://doi.org/10.1088/1361-6668/aa9e17

Submission history

From: Roberto Monaco [view email]
[v1] Thu, 6 Jul 2017 08:08:17 UTC (1,962 KB)
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