Low-frequency Noise in Josephson Junctions for Superconducting Qubits

Details Low-frequency Noise in Josephson Junctions for Superconducting Qubits Low-frequency Noise in Josephson Junctions for Superconducting Qubits

2006-04-12

arxiv.org/abs/cond-mat/0604306v2

Appl. Phys. Lett. 89, 122516 (2006)

Physics

Condensed Matter

Superconductivity

Journal ref added, minor changes to match published version

Scientific paper

10.1063/1.2357010

We have studied low-frequency resistance fluctuations in shadow-evaporated Al/AlOx/Al tunnel junctions. Between 300 K and 5 K the spectral density follows a 1/f-law. Below 5 K, individual defects distort the 1/f-shape of the spectrum. The spectral density decreases linearly with temperature between 150 K and 1 K and saturates below 0.8 K. At 4.2 K, the spectral density is about two orders of magnitude lower than expected from a recent survey [D. J. Van Harlingen et al., Phys. Rev. B 70, 064510 (2004)]. Due to the saturation below 0.8 K the estimated qubit dephasing times at 100 mK are only about two times longer than calculated by Van Harlingen et al.

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