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TT: Fachverband Tiefe Temperaturen
TT 12: New Experimental Techniques
TT 12.2: Vortrag
Mittwoch, 29. September 2021, 10:15–10:30, H7
Reaching the ultimate energy resolution of a quantum detector — •Bayan Karimi1, Fredrik Brange1,2, Danilo Nikolic3, Joonas T. Peltonen1, Peter Samuelsson2, Wolfgang Belzig3, and Jukka P. Pekola1 — 1QuESTech and QTF Centre of Excellence, Department of Applied Physics, Aalto University, Finland — 2Department of Physics and NanoLund, Lund University, Sweden — 3QuESTech and Fachbereich Physik, Universität Konstanz, Germany
We demonstrate experimentally detection of equilibrium fluctuations of temperature in a system of about 108 electrons exchanging energy with phonon bath at a fixed temperature [1]. In this experiment, we employ a radio-frequency thermometer, connected to a nanocalorimeter, based on a zero-bias anomaly of a tunnel junction between a superconductor and proximitized normal metal [2,3]. It features noninvasive detection and essentially uncompromised sensitivity down to the lowest temperatures of below 20 mK. We show theoretically that this detector is capable of observing single microwave photons in a continuous manner [4,5].
[1] B. Karimi, F. Brange, P. Samuelsson, J. P. Pekola, Nat. Commun. 11, 367 (2020)
[2] B. Karimi and J. P. Pekola, Phys. Rev. Appl. 10, 054048 (2018)
[3] B. Karimi, D. Nikolić, T. Tuukkanen, J. T. Peltonen, W. Belzig, J. P. Pekola, Phys. Rev. Applied 13, 054001 (2020)
[4] B. Karimi and J. P. Pekola, Phys. Rev. Lett. 124, 170601 (2020)
[5] J. P. Pekola and B. Karimi, arXiv:2010.11122 (2020)