Magnetic flux noise in the three Josephson junctions superconducting ring

Details Magnetic flux noise in the three Josephson junctions superconducting ring Magnetic flux noise in the three Josephson junctions superconducting ring

2008-01-24

arxiv.org/abs/0801.3761v1

Physics

Condensed Matter

Superconductivity

19 pages 9 figures

Scientific paper

10.1063/1.2920076

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.

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