Introduction to Quantum Metrology by Waldemar Nawrocki
Author:Waldemar Nawrocki
Language: eng
Format: epub
ISBN: 9783030196776
Publisher: Springer International Publishing
5.6.1 R-SQUID Noise Thermometer
In a noise thermometer the role of a temperature sensor is played by a resistor; the measurement signal is the thermal noise voltage (or electromotive force) across the resistor or its thermal noise current. Noise thermometers with an R-SQUID or a DC-SQUID have applications in low-temperature physics and metrology.
The resistive SQUID, or R-SQUID, is a high-frequency RF-SQUID with a resistively shunted Josephson junction. Direct current can flow through the shunt resistor to produce a DC voltage V0 across the resistor. If a DC voltage V0 and an AC voltage Vn sinωt (the measurement signal) are applied to the junction, a signal with a frequency f will appear at the junction as a result of the internal AC Josephson effect:
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