Projects per year
Abstract
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.
Original language | English |
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Journal | Nature Nanotechnology |
DOIs | |
Publication status | E-pub ahead of print - 2024 |
MoE publication type | A1 Journal article-refereed |
Fingerprint
Dive into the research topics of 'Bolometric detection of Josephson radiation'. Together they form a unique fingerprint.Datasets
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Data for Bolometric detection of Josephson radiation
Karimi, B. (Creator), Steffensen, G. O. (Creator), Higginbotham, A. P. (Creator), Marcus, C. M. (Creator), Levy Yeyati, A. (Creator) & Pekola, J. (Creator), Zenodo, 22 Aug 2024
DOI: 10.5281/zenodo.12684006, https://zenodo.org/records/12684006
Dataset
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THEPOW: Empowering quantum nanoelectronic devices using thermal energy
Pekola, J. (Principal investigator), Lemziakov, S. (Project Member), Lvov, D. (Project Member) & Karimi, B. (Project Member)
01/09/2022 → 31/08/2026
Project: Academy of Finland: Other research funding
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QTF 2 stage: Finnish Centre of Exellence in Quantum Technology
Pekola, J. (Principal investigator), Thomas, G. (Project Member), Ankerhold, E. (Project Member), Subero Rengel, D. (Project Member), Satrya, C. (Project Member), Chang, Y.-C. (Project Member), Lemziakov, S. (Project Member), Karimi, B. (Project Member) & Marín Suárez, M. (Project Member)
01/05/2020 → 31/12/2022
Project: Academy of Finland: Other research funding
Equipment
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OtaNano - Nanomicroscopy Center
Seitsonen, J. (Manager) & Rissanen, A. (Other)
OtaNanoFacility/equipment: Facility