Quantum-circuit refrigerator

Kuan Yen Tan (), Matti Partanen, Russell E. Lake, Joonas Govenius, Shumpei Masuda and Mikko Möttönen ()
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Kuan Yen Tan: QCD Labs, COMP Centre of Excellence, Aalto University
Matti Partanen: QCD Labs, COMP Centre of Excellence, Aalto University
Russell E. Lake: QCD Labs, COMP Centre of Excellence, Aalto University
Joonas Govenius: QCD Labs, COMP Centre of Excellence, Aalto University
Shumpei Masuda: QCD Labs, COMP Centre of Excellence, Aalto University
Mikko Möttönen: QCD Labs, COMP Centre of Excellence, Aalto University

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Quantum technology promises revolutionizing applications in information processing, communications, sensing and modelling. However, efficient on-demand cooling of the functional quantum degrees of freedom remains challenging in many solid-state implementations, such as superconducting circuits. Here we demonstrate direct cooling of a superconducting resonator mode using voltage-controllable electron tunnelling in a nanoscale refrigerator. This result is revealed by a decreased electron temperature at a resonator-coupled probe resistor, even for an elevated electron temperature at the refrigerator. Our conclusions are verified by control experiments and by a good quantitative agreement between theory and experimental observations at various operation voltages and bath temperatures. In the future, we aim to remove spurious dissipation introduced by our refrigerator and to decrease the operational temperature. Such an ideal quantum-circuit refrigerator has potential applications in the initialization of quantum electric devices. In the superconducting quantum computer, for example, fast and accurate reset of the quantum memory is needed.

Date: 2017
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DOI: 10.1038/ncomms15189

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