Tunable refrigerator for nonlinear quantum electric circuits

Hao Hsu, Matti Silveri, András Gunyhó, Jan Goetz, Gianluigi Catelani, Mikko Möttönen

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)


The emerging quantum technological applications call for fast and accurate initialization of the corresponding devices to low-entropy quantum states. To this end, we theoretically study a recently demonstrated quantum-circuit refrigerator in the case of nonlinear quantum electric circuits such as superconducting qubits. The maximum refrigeration rate of transmon and flux qubits is observed to be roughly an order of magnitude higher than that of usual linear resonators, increasing flexibility in the design. We find that for typical experimental parameters, the refrigerator is suitable for resetting different qubit types to fidelities above 99.99% in a few or a few tens of nanoseconds depending on the scenario. Thus the refrigerator appears to be a promising tool for quantum technology and for detailed studies of open quantum systems.

Original languageEnglish
Article number235422
JournalPhysical Review B
Issue number23
Publication statusPublished - 15 Jun 2020
MoE publication typeA1 Journal article-refereed


This research was financially supported by: European Research Council under Grant No. 681311 (QUESS) and Marie Skłodowska-Curie Grant No. 795159; Academy of Finland under its Centres of Excellence Program Grant No. 312300, and Grant Nos. 265675, 305237, 305306, 308161, 312300, 314302, 316551, 316619, 320086; Finnish Cultural Foundation; the Jane and Aatos Erkko Foundation; Vilho, Yrjö and Kalle Väisälä Foundation; the Emil Aaltonen Foundation; the Alfred Kordelin Foundation; the Technology Industries of Finland Centennial Foundation; and the Internationalization Fund - Cutting-Edge Ideas initiative of Forschungszentrum Jülich.


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