WSi weak link element with a non-sinusoidal current-phase relation
量子物理
2026-05-21 v1 超导电性
摘要
Nonlinearity is an essential ingredient for encoding quantum states with non-uniform energy spacing, implementing coherent quantum gates, reading out qubits, amplifying, and mixing electromagnetic signals. In this work, we demonstrate the nonlinear behavior of a constriction fabricated from an amorphous, high-kinetic inductance material, tungsten silicide, embedded in a three-dimensional RF-SQUID. We find that the results are consistent with the weak link behaving as a Josephson junction with a sawtooth-like current-phase relation or a quantum phase slip element. Finally, we measure relaxation times of the metastable, persistent-current states trapped in the local minima of the potential.
引用
@article{arxiv.2605.20652,
title = {WSi weak link element with a non-sinusoidal current-phase relation},
author = {Sarah Garcia Jones and Trevyn F. Q. Larson and Sai Pavan Chitta and Heli Vora and Varun Verma and Sae Woo Nam and José Aumentado and Jens Koch and Raymond W. Simmonds and András Gyenis},
journal= {arXiv preprint arXiv:2605.20652},
year = {2026}
}