Josephson tunnel junctions with nonlinear damping for RSFQ-qubit circuit applications

Details Josephson tunnel junctions with nonlinear damping for RSFQ-qubit circuit applications Josephson tunnel junctions with nonlinear damping for RSFQ-qubit circuit applications

2004-11-24

arxiv.org/abs/cond-mat/0411607v1

Appl. Phys. Lett. v.86, 032501 (2005)

Physics

Condensed Matter

Superconductivity

4 pages incl. 3 figures

Scientific paper

10.1063/1.1852076

We demonstrate that shunting of Superconductor-Insulator-Superconductor Josephson junctions by Superconductor-Insulator-Normal metal (S-I-N) structures having pronounced non-linear I-V characteristics can remarkably modify the Josephson dynamics. In the regime of Josephson generation the phase behaves as an overdamped coordinate, while in the superconducting state the damping and current noise are strikingly small, that is vitally important for application of such junctions for readout and control of Josephson qubits. Superconducting Nb/AlO${_x}$/Nb junction shunted by Nb/AlO${_x}$/AuPd junction of S-I-N type was fabricated and, in agreement with our model, exhibited non-hysteretic I-V characteristics at temperatures down to at least 1.4 K.

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