Bolometric detection of Josephson radiation.

Autor: Karimi B; Pico Group, QTF Centre of Excellence, Department of Applied Physics, Aalto University, Espoo, Finland. bayan.karimi@aalto.fi.; QTF Centre of Excellence, Department of Physics, Faculty of Science, University of Helsinki, Helsinki, Finland. bayan.karimi@aalto.fi., Steffensen GO; Departamento de Física Teórica de la Materia Condensada, Condensed Matter Physics Center (IFIMAC) and Instituto Nicolás Cabrera, Universidad Autonoma de Madrid, Madrid, Spain.; Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas (CSIC), Madrid, Spain., Higginbotham AP; The James Franck Institute and Department of Physics, University of Chicago, Chicago, IL, USA.; IST Austria, Klosterneuburg, Austria., Marcus CM; Materials Science and Engineering and Department of Physics, University of Washington, Seattle, WA, USA.; Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark.; InstituteQ-The Finnish Quantum Institute, Aalto University, Espoo, Finland., Levy Yeyati A; Departamento de Física Teórica de la Materia Condensada, Condensed Matter Physics Center (IFIMAC) and Instituto Nicolás Cabrera, Universidad Autonoma de Madrid, Madrid, Spain., Pekola JP; Pico Group, QTF Centre of Excellence, Department of Applied Physics, Aalto University, Espoo, Finland.
Jazyk: angličtina
Zdroj: Nature nanotechnology [Nat Nanotechnol] 2024 Aug 22. Date of Electronic Publication: 2024 Aug 22.
DOI: 10.1038/s41565-024-01770-7
Abstrakt: One of the most promising approaches towards large-scale quantum computation uses devices based on many Josephson junctions. Yet, even today, open questions regarding the single junction remain unsolved, such as the detailed understanding of the quantum phase transitions, the coupling of the Josephson junction to the environment or how to improve the coherence of a superconducting qubit. Here we design and build an engineered on-chip reservoir connected to a Josephson junction that acts as an efficient bolometer for detecting the Josephson radiation under non-equilibrium, that is, biased conditions. The bolometer converts the a.c. Josephson current at microwave frequencies up to about 100 GHz into a temperature rise measured by d.c. thermometry. A circuit model based on realistic parameter values captures both the current-voltage characteristics and the measured power quantitatively. The present experiment demonstrates an efficient, wide-band, thermal detection scheme of microwave photons and provides a sensitive detector of Josephson dynamics beyond the standard conductance measurements.
(© 2024. The Author(s).)
Databáze: MEDLINE
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