II. Applications of the Josephson Effect
II. Applications of the Josephson Effect
II. Applications of the Josephson Effect
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R. Gross, A. Marx, and F. Deppe © Wal<strong>the</strong>r-Meißner-Institut (2001 - 2013)<br />
4.1.3 Operation and Performance <strong>of</strong> dc-SQUIDs<br />
• improve performance od dc-SQUID: decrease T and C, increase J c<br />
- ²(f) is given in units <strong>of</strong> ~ ' 10 -34 Js<br />
• optimized SQUIDs: ²(f) approaches quantum limit, practical SQUIDs: ²(f) ≈ 10 ~<br />
• dimensionless parameter:<br />
• reduced noise energy:<br />
rapid increase for<br />
°¯L > 0.2<br />
<strong>the</strong>rmal noise rounding<br />
<strong>of</strong> IVC<br />
D. Kölle et al., Rev. Mod. Phys. 71, 631 (1999)<br />
AS-Chap. 4 - 22
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