SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 66: Cryogenic Detectors
TT 66.1: Hauptvortrag
Freitag, 31. März 2023, 09:30–10:00, HSZ 304
Towards ultrasensitive calorimetric detection in superconducting quantum circuits — •Bayan Karimi1,2, Kuan-Hsun Chiang2, Yu-Cheng Chang2, Danilo Nikolic3, Joonas T. Peltonen2, Wolfgang Belzig3, and Jukka P. Pekola2 — 1QTF Centre of Excellence, Department of Physics, Faculty of Science, University of Helsinki, Finland — 2Pico group, QTF Centre of Excellence, Department of Applied Physics, Aalto University, Finland — 3Fachbereich Physik, Universität Konstanz, D-78467, Germany
We demonstrate experimentally an ultra-sensitive thermal detector formed of an electronic absorber coupled to a phonon bath, which reaches the ultimate noise level dictated by the fundamental thermal fluctuations [1]. A scheme of coupling a superconducting qubit to this calorimeter is presented and we conclude positively about sufficient signal-to-noise ratio (SNR) in detecting a microwave photon emitted by it [2,3,4]. Recently this scheme was applied to the thermal detection of quantum phase slips in a Josephson junction [5], and currently we are performing experiments on the proposed qubit calorimetry.
[1] J. P. Pekola and B. Karimi, Rev. Mod. Phys. 93, 041001 (2021)
[2] B. Karimi and J. P. Pekola, Phys. Rev. Lett. 124, 170601 (2020)
[3] B. Karimi, D. Nikolic, T. Tuukkanen, J. T. Peltonen, W. Belzig, and J. P. Pekola, Phys. Rev. Applied 13, 054001 (2020)
[4] J. P. Pekola and B. Karimi, Phys. Rev. X 12, 011026 (2022)
[5] E. Gumus, D. Majidi, D. Nikolic, P. Raif, B. Karimi, J. T. Peltonen, E. Scheer, J. P. Pekola, H. Courtois, W. Belzig, and C. B. Winkelmann, arXiv:2202.08726 [cond-mat.mes-hall]