Tunable Coupling Architecture for Fixed-frequency Transmons

• URL: http://arxiv.org/abs/2101.07746v1
• Date: Tue, 19 Jan 2021 17:38:18 GMT
• Title: Tunable Coupling Architecture for Fixed-frequency Transmons
• Authors: J. Stehlik, D. M. Zajac, D. L. Underwood, T. Phung, J. Blair, S. Carnevale, D. Klaus, G. A. Keefe, A. Carniol, M. Kumph, Matthias Steffen, O. E. Dial
• Abstract summary: We present a modified tunable bus architecture appropriate for fixed-frequency qubits. We characterize this coupler on a range of two-qubit devices achieving a maximum gate fidelity of $99.85%$.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Implementation of high-fidelity two-qubit operations is a key ingredient for scalable quantum error correction. In superconducting qubit architectures tunable buses have been explored as a means to higher fidelity gates. However, these buses introduce new pathways for leakage. Here we present a modified tunable bus architecture appropriate for fixed-frequency qubits in which the adiabaticity restrictions on gate speed are reduced. We characterize this coupler on a range of two-qubit devices achieving a maximum gate fidelity of $99.85\%$. We further show the calibration is stable over one day.

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