Tunable refrigerator for nonlinear quantum electric circuits

Hao Hsu*, Matti Silveri, Andras Gunyho, Jan Goetz, Gianluigi Catelani, Mikko Mottonen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

13 Citations (Scopus)
169 Downloads (Pure)


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
Number of pages20
JournalPhysical Review B
Issue number23
Publication statusPublished - 11 Jun 2020
MoE publication typeA1 Journal article-refereed




Dive into the research topics of 'Tunable refrigerator for nonlinear quantum electric circuits'. Together they form a unique fingerprint.

Cite this