Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 31: Superconducting Electronics: SQUIDs, Qubits, Circuit QED, Quantum Coherence and Quantum Information Systems 1

TT 31.4: Vortrag

Mittwoch, 18. März 2020, 10:15–10:30, HSZ 03

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. Pekola11QuESTech and QTF Centre of Excellence, Department of Applied Physics, Aalto University, 00076 Aalto, Finland — 2Department of Physics and NanoLund, Lund University, Box 188, SE-221 00 Lund, Sweden — 3QuESTech and Fachbereich Physik, Universität Konstanz, D-78467, Germany

We present a radio-frequency thermometer based on a zero-bias anomaly of a tunnel junction between a superconductor and proximitized normal metal [1,2]. It features noninvasive detection and essentially uncompromised sensitivity down to the lowest temperatures of below 20 mK in contrast to commonly used finite bias thermometers that dissipate orders of magnitude more power and lose their sensitivity at low temperatures. Using this thermometer we demonstrate detection of equilibrium fluctuations of temperature in a system of about 108 electrons exchanging energy with phonon bath at a fixed temperature [3].

[1] B. Karimi, J. P. Pekola, Phys. Rev. Appl. 10, 054048 (2018).
[2] B. Karimi, D.anilo Nikolić, T. Tuukkanen, J. T. Peltonen, W. Belzig, J. P. Pekola, arXiv:1911.02844 (2019).
[3] B. Karimi, F. Brange, P. Samuelsson, J. P. Pekola, arXiv:1904.05041 (2019).

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