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Tunable Superconducting Qubits with Flux-Independent Coherence

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arxiv 1702.02253 v2 pith:2DQWUQGH submitted 2017-02-08 cond-mat.supr-con quant-ph

M. D. Hutchings , Jared B. Hertzberg , Yebin Liu , Nicholas T. Bronn , George A. Keefe , Jerry M. Chow , B. L. T. Plourde This is my paper · ORCID
classification cond-mat.supr-conquant-ph
keywords qubitsdephasingfluxnoisetunableflux-independentsuperconductingtunability
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We have studied 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 was used to fabricate qubits where dephasing due to flux noise was suppressed below other dephasing sources, leading to flux-independent dephasing times T2* ~ 15 us over a tunable range of ~340 MHz. Such tunable qubits have the potential to create high-fidelity, fault-tolerant qubit gates and fundamentally improve scalability for a quantum processor.

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  1. Fabrication of low-loss Josephson parametric devices

    quant-ph 2024-12 conditional novelty 5.0 of 10

    Fabrication optimizations yield Josephson parametric converters and amplifiers with internal quality factors exceeding 100,000 at the single-photon level, a record for tunable Josephson circuits.

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