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

Abstract

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.

4 pages incl. 3 figures

References in corpus (1)

• Quantum state engineering with Josephson-junction devices

Cited by in corpus (9)

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• Verification of stable operation of rapid single flux quantum devices with selective dissipation
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