Cryogenic sensor enabling broad-band and traceable power measurements

J. P. Girard, R. E. Lake*, W. Liu, R. Kokkoniemi, E. Visakorpi, J. Govenius, M. Möttönen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)
70 Downloads (Pure)

Abstract

Recently, great progress has been made in the field of ultrasensitive microwave detectors, reaching even the threshold for utilization in circuit quantum electrodynamics. However, cryogenic sensors lack the compatibility with broad-band metrologically traceable power absorption measurements at ultralow powers, which restricts their range of applications. Here, we demonstrate such measurements using an ultralow-noise nanobolometer, which we extend by an additional direct-current (dc) heater input. The tracing of the absorbed power relies on comparing the response of the bolometer between radio frequency and dc-heating powers traced to the Josephson voltage and quantum Hall resistance. To illustrate this technique, we demonstrate two different methods of dc-substitution to calibrate the power that is delivered to the base temperature stage of a dilution refrigerator using our in situ power sensor. As an example, we demonstrate the ability to accurately measure the attenuation of a coaxial input line between the frequencies of 50 MHz and 7 GHz with an uncertainty down to 0.1 dB at a typical input power of −114 dBm.

Original languageEnglish
Article number054710
Pages (from-to)1-11
Number of pages11
JournalReview of Scientific Instruments
Volume94
Issue number5
DOIs
Publication statusPublished - 1 May 2023
MoE publication typeA1 Journal article-refereed

Fingerprint

Dive into the research topics of 'Cryogenic sensor enabling broad-band and traceable power measurements'. Together they form a unique fingerprint.

Cite this