Projects per year
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 language | English |
---|---|
Article number | 054710 |
Pages (from-to) | 1-11 |
Number of pages | 11 |
Journal | Review of Scientific Instruments |
Volume | 94 |
Issue number | 5 |
DOIs | |
Publication status | Published - 1 May 2023 |
MoE publication type | A1 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.-
OpenSuperQPlus100: Open Superconducting Quantum Computers
Paraoanu, G.-S. (Principal investigator) & Moskalenko, I. (Project Member)
01/03/2023 → 31/08/2026
Project: EU: Framework programmes funding
-
ERC ConceptQ: New superconducting quantum-electric device concept utilizing increased anharmonicity, simple structure, and insensitivity to charge and flux noise
Möttönen, M. (Principal investigator), Duda, R. (Project Member), Vadimov, V. (Project Member), Mörstedt, T. (Project Member), Suominen, H. (Project Member), Zarrabi, H. (Project Member), Sunada, Y. (Project Member) & Tuokkola, M. (Project Member)
28/10/2022 → 31/10/2027
Project: EU: ERC grants
-
SPINBUS: Quantum Bus for a Quantum Computer Based on Spins in Silicon
Tan, K. (Principal investigator), Suominen, H. (Project Member), Tuohino, S. (Project Member), Gunyho, A. (Project Member), Duda, R. (Project Member) & Kivijärvi, H. (Project Member)
01/09/2020 → 31/08/2022
Project: Academy of Finland: Other research funding