Tunable Superconducting Flux Qubits with Long Coherence Times

T. Chang, T. Cohen, I. Holzman, G. Catelani, M. Stern

Research output: Contribution to journalArticlepeer-review


In this work, we study a series of tunable flux qubits inductively coupled to a coplanar waveguide resonator fabricated on a sapphire substrate. Each qubit includes an asymmetric superconducting quantum interference device, which is controlled by the application of an external magnetic field and acts as a tunable Josephson junction. The tunability of the qubits is typically ±3.5GHz around their central gap frequency. The measured relaxation times are limited by dielectric losses in the substrate and can attain T1∼8μs. The echo dephasing times are limited by flux noise even at optimal points and reach T2E∼4μs, almost an order of magnitude longer than state of the art.

Original languageEnglish
Article number024066
JournalPhysical Review Applied
Issue number2
StatePublished - Feb 2023

Bibliographical note

Funding Information:
This research is supported by the Israeli Science Foundation under Grants No. 426/15, No. 898/19, and No. 963/19. G.C. acknowledges support by the German Federal Ministry of Education and Research (BMBF), funding program Quantum technologies—from basic research to market, project QSolid (Grant No. 13N16149).

Publisher Copyright:
© 2023 American Physical Society.


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