Magnetic flux noise in the three Josephson junctions superconducting ring
Abstract
We analyze the influence of noise on magnetic properties of a su- perconducting loop which contains three Josephson junctions. This circuit is a classical analog of a persistent current (flux) qubit. A loop supercurrent induced by external magnetic field in the presence of thermal fluctuations is calculated. In order to get connection with experiment we calculate the impedance of the low-frequency tank cir- cuit which is inductively coupled with a loop of interest. We compare obtained results with the results in quantum mode - when the three junction loop exhibits quantum tunneling of the magnetic flux. We demonstrate that the tank-loop impedance in the classical and quan- tum modes have different temperature dependence and can be easily distinguished experimentally.
Keywords
Cite
@article{arxiv.0801.3761,
title = {Magnetic flux noise in the three Josephson junctions superconducting ring},
author = {E. Il'ichev and A. N. Omelyanchouk},
journal= {arXiv preprint arXiv:0801.3761},
year = {2009}
}
Comments
19 pages 9 figures