Josephson vortex coupled to a flux qubit
Superconductivity
2015-06-12 v1
Abstract
Experiments towards realizing a readout of superconducting qubits by using ballistic Josephson vortices are reported. We measured the microwave radiation induced by a fluxon moving in an annular Josephson junction. By coupling a flux qubit as a current dipole to the annular junction, we detect periodic variations of the fluxon's oscillation frequency versus magnetic flux through the qubit. We found that the scattering of a fluxon on a current dipole can lead to the acceleration of a fluxon regardless of a dipole polarity. We use the perturbation theory and numerical simulations of the perturbed sine-Gordon equation to analyze our results.
Keywords
Cite
@article{arxiv.1301.5164,
title = {Josephson vortex coupled to a flux qubit},
author = {Kirill G. Fedorov and Anastasia V. Shcherbakova and Roland Schäfer and Alexey V. Ustinov},
journal= {arXiv preprint arXiv:1301.5164},
year = {2015}
}