Improving high-T_c dc-SQUID performance by junction asymmetry

Details Improving high-T_c dc-SQUID performance by junction asymmetry Improving high-T_c dc-SQUID performance by junction asymmetry

2008-12-22

arxiv.org/abs/0812.4237v2

Supercond. Sci. Technol. 22 (2009) 055002

Physics

Condensed Matter

Superconductivity

9 pages, 4 figures. v2: published version

Scientific paper

10.1088/0953-2048/22/5/055002

We study noise and noise energy of a high-T$_c$ dc SQUID fabricated on a high-$\epsilon_R$ substrate whose conduction properties are given by transmission line physics. We show that transmission line resonances greatly enhance the noise. Remarkably, resistance asymmetry enhances these resonances even more. However, as the transfer function scales the same way, the noise energy is reduced by asymmetry greatly enhancing the flexibility and performance of the SQUID.

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