Electric field control of radiative heat transfer in a superconducting circuit

Olivier Maillet (), Diego Subero, Joonas T. Peltonen, Dmitry S. Golubev and Jukka P. Pekola
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Olivier Maillet: Aalto University School of Science
Diego Subero: Aalto University School of Science
Joonas T. Peltonen: Aalto University School of Science
Dmitry S. Golubev: Aalto University School of Science
Jukka P. Pekola: Aalto University School of Science

Nature Communications, 2020, vol. 11, issue 1, 1-6

Abstract: Abstract Heat is detrimental for the operation of quantum systems, yet it fundamentally behaves according to quantum mechanics, being phase coherent and universally quantum-limited regardless of its carriers. Due to their robustness, superconducting circuits integrating dissipative elements are ideal candidates to emulate many-body phenomena in quantum heat transport, hitherto scarcely explored experimentally. However, their ability to tackle the underlying full physical richness is severely hindered by the exclusive use of a magnetic flux as a control parameter and requires complementary approaches. Here, we introduce a dual, magnetic field-free circuit where charge quantization in a superconducting island enables thorough electric field control. We thus tune the thermal conductance, close to its quantum limit, of a single photonic channel between two mesoscopic reservoirs. We observe heat flow oscillations originating from the competition between Cooper-pair tunnelling and Coulomb repulsion in the island, well captured by a simple model. Our results highlight the consequences of charge-phase conjugation on heat transport, with promising applications in thermal management of quantum devices and design of microbolometers.

Date: 2020
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DOI: 10.1038/s41467-020-18163-8

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