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We are using a low-T c DC SQUID to perform current-sensing noise thermometry, by measuring the thermal noise currents in a copper resistor. The temperature is obtained from the Nyquist formula. This is a practical thermometer for use from 4.2K to below 1mK, with a percentage precision independent of temperature. Using a 0.34mΩ resistor, the thermometer had an amplifier noise temperature T...
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