Tunable Superconducting Qubits with Flux-Independent Coherence

M. D. Hutchings, J. B. Hertzberg, Y. Liu, N. T. Bronn, G. A. Keefe, Markus Brink, Jerry M. Chow, Britton Plourde

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Abstract

We study the impact of low-frequency magnetic flux noise upon superconducting transmon qubits with various levels of tunability. We find that qubits with weaker tunability exhibit dephasing that is less sensitive to flux noise. This insight is used to fabricate qubits where dephasing due to flux noise is suppressed below other dephasing sources, leading to flux-independent dephasing times T2∗∼15 μs over a tunable range of approximately 340 MHz. Such tunable qubits have the potential to create high-fidelity, fault-tolerant qubit gates and to fundamentally improve scalability for a quantum processor.

Original languageEnglish (US)
Article number044003
JournalPhysical Review Applied
Volume8
Issue number4
DOIs
StatePublished - Oct 12 2017

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Hutchings, M. D., Hertzberg, J. B., Liu, Y., Bronn, N. T., Keefe, G. A., Brink, M., Chow, J. M., & Plourde, B. (2017). Tunable Superconducting Qubits with Flux-Independent Coherence. Physical Review Applied, 8(4), [044003]. https://doi.org/10.1103/PhysRevApplied.8.044003