Superposition Johnson Noise Thermometry with a Quantum Voltage Noise Source for Calibration

Zhou, Kunli; Han, Qina; Wang, Miaoer; Zhao, Jianguo; Qu, Jinping

doi:10.1109/cpem49742.2020.9191839

Cited by 3 publications

(1 citation statement)

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“…This technique eliminates the switch, halves the number of spectral measurements (and measurement time), and enables an increased bandwidth, but it does require very high linearity of the electronics. Two separate development efforts are underway at present, one for industrial applications [94,95], and one for primary measurements [96][97][98]. There remain unresolved questions about the effects of spectral mismatch and non-linearity when low uncertainties are required.…”

Section: Discussionmentioning

confidence: 99%

Practical realisation of the kelvin by Johnson noise thermometry

Benz,

Coakley,

Flowers-Jacobs

et al. 2024

Metrologia

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Johnson noise thermometry (JNT) is a purely electronic method of thermodynamic thermometry. In primary JNT, the temperature is inferred from a comparison of the Johnson noise voltage of a resistor at the unknown temperature with a pseudo-random noise synthesized by a quantum-based voltage-noise source (QVNS). The advantages of the method are that it relies entirely on electronic measurements, and it can be used over a wide range of temperatures due to the ability of the QVNS to generate programmable, scalable, and accurate reference signals. The disadvantages are the requirement of cryogenic operation of the QVNS, the need to match the frequency responses of the leads of the sense resistor and the QVNS, and long measurement times. This review collates advice on current best practice for a primary Johnson noise thermometer based on the switched correlator and QVNS. The method achieves an uncertainty of about 1 mK near 300 K and is suited to operation between 4 K and 1000 K.

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