2006/04/30 by Jonathan Eroms, J. Eroms, L. C. van Schaarenburg +8 · 4 citations
Computer Science · Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum Information and Cryptography #Quantum and electron transport phenomena #cond-mat.supr-con
paper · pdf · doi:10.1063/1.2357010
published as Appl. Phys. Lett. 89, 122516 (2006) · Journal ref added, minor changes to match published version
openalex publication_date 2006/09/18 · arxiv created 2006/10/03 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31
The authors have studied low-frequency resistance fluctuations in shadow-evaporated Al∕AlOx∕Al tunnel junctions. Between 300 and 5K the spectral density follows a 1∕f law. Below 5K, individual defects distort the 1∕f shape of the spectrum. The spectral density decreases linearly with temperature between 150 and 1K and saturates below 0.8K. At 4.2K, it 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 saturation below 0.8K the estimated qubit dephasing times at 100mK are only about two times longer than calculated by Van Harlingen et al.