ISSN:
1573-7357
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract This paper presents experimental data on a comparative study of a dc SQUID with voltage and current bias. We introduce a cross-correlated dynamic resistance of the device defined as a ratio R dCV = ηVC/ηIV, where ηVC = (∂V/∂Φ)∣ A is the slope of the voltage-to-flux characteristics measured in the current bias mode and η IV = (∂I/∂Φ)∣ A is the slope of the current-to-flux characteristics measured with voltage bias. It has been found that R dCV may deviate strongly from the dynamic resistance observed in the current bias mode of operation. The intrinsic energy resolution of the SQUID ε remains unchanged for both modes of operation, but the current noise of the voltage biased device scales with the cross-correlated dynamic resistance. In our SQUID with the loop inductance L = 105 pH, ε is equal to 37 h in the white noise region at a temperature of 4.2 K.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1004682604553
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