Photonic heat transport in three terminal superconducting circuit

Azat Gubaydullin (), George Thomas, Dmitry S. Golubev, Dmitrii Lvov, Joonas T. Peltonen and Jukka P. Pekola
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Azat Gubaydullin: Department of Applied Physics, Aalto University School of Science
George Thomas: Department of Applied Physics, Aalto University School of Science
Dmitry S. Golubev: Department of Applied Physics, Aalto University School of Science
Dmitrii Lvov: Department of Applied Physics, Aalto University School of Science
Joonas T. Peltonen: Department of Applied Physics, Aalto University School of Science
Jukka P. Pekola: Department of Applied Physics, Aalto University School of Science

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract We report an experimental realization of a three-terminal photonic heat transport device based on a superconducting quantum circuit. The central element of the device is a flux qubit made of a superconducting loop containing three Josephson junctions, which can be tuned by magnetic flux. It is connected to three resonators terminated by resistors. By heating one of the resistors and monitoring the temperatures of the other two, we determine photonic heat currents in the system and demonstrate their tunability by magnetic field at the level of 1 aW. We determine system parameters by performing microwave transmission measurements on a separate nominally identical sample and, in this way, demonstrate clear correlation between the level splitting of the qubit and the heat currents flowing through it. Our experiment is an important step towards realization of heat transistors, heat amplifiers, masers pumped by heat and other quantum heat transport devices.

Date: 2022
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DOI: 10.1038/s41467-022-29078-x

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