Tunable Superconducting Flux Qubits with Long Coherence Times

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

doi:10.1103/physrevapplied.19.024066

Tunable Superconducting Flux Qubits with Long Coherence Times

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

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 language	English
Article number	024066
Number of pages	6
Journal	Physical Review Applied
Volume	19
Issue number	2
DOIs	https://doi.org/10.1103/physrevapplied.19.024066
State	Published - Feb 2023

Bibliographical note

Publisher Copyright:
© 2023 American Physical Society.

Funding

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).

Funders	Funder number
Bundesministerium für Bildung und Forschung	13N16149
Israel Science Foundation	963/19, 898/19, 426/15

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10.1103/physrevapplied.19.024066

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Tunable Superconducting Flux Qubits with Long Coherence Times

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