Rights statement: © 2021 American Physical Society
Accepted author manuscript, 1.17 MB, PDF document
Available under license: CC BY-NC: Creative Commons Attribution-NonCommercial 4.0 International License
Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Non-galvanic calibration and operation of a quantum dot thermometer
AU - Chawner, Joshua
AU - Barraud, S.
AU - Gonzalez-Zalba, M. F.
AU - Holt, Stephen
AU - Laird, Edward
AU - Pashkin, Yuri
AU - Prance, Jonathan
N1 - © 2021 American Physical Society
PY - 2021/3/16
Y1 - 2021/3/16
N2 - A cryogenic quantum dot thermometer is calibrated and operated using only a single nongalvanic gate connection. The thermometer is probed with radio-frequency reflectometry and calibrated by fitting a physical model to the phase of the reflected radio-frequency signal taken at temperatures across a small range. Thermometry of the source and drain reservoirs of the dot is then performed by fitting the calibrated physical model to new phase data. The thermometer can operate at the transition between thermally broadened and lifetime-broadened regimes and outside the temperatures used in calibration. Electron thermometry is performed at temperatures between 3.0K and 1.0K, in both a 1-K cryostat and a dilution refrigerator. In principle, the experimental setup enables fast electron-temperature readout with a sensitivity of 4.0±0.3mK/√Hz, at kelvin temperatures. The nongalvanic calibration process gives a readout of physical parameters, such as the quantum dot lever arm. The demodulator used for reflectometry readout is readily available at relatively low cost.
AB - A cryogenic quantum dot thermometer is calibrated and operated using only a single nongalvanic gate connection. The thermometer is probed with radio-frequency reflectometry and calibrated by fitting a physical model to the phase of the reflected radio-frequency signal taken at temperatures across a small range. Thermometry of the source and drain reservoirs of the dot is then performed by fitting the calibrated physical model to new phase data. The thermometer can operate at the transition between thermally broadened and lifetime-broadened regimes and outside the temperatures used in calibration. Electron thermometry is performed at temperatures between 3.0K and 1.0K, in both a 1-K cryostat and a dilution refrigerator. In principle, the experimental setup enables fast electron-temperature readout with a sensitivity of 4.0±0.3mK/√Hz, at kelvin temperatures. The nongalvanic calibration process gives a readout of physical parameters, such as the quantum dot lever arm. The demodulator used for reflectometry readout is readily available at relatively low cost.
U2 - 10.1103/PhysRevApplied.15.034044
DO - 10.1103/PhysRevApplied.15.034044
M3 - Journal article
VL - 15
JO - Physical Review Applied
JF - Physical Review Applied
SN - 2331-7019
IS - 3
M1 - 034044
ER -