Characterization of Control in a Superconducting Qutrit Using Randomized Benchmarking

• URL: http://arxiv.org/abs/2009.00599v2
• Date: Thu, 22 Jul 2021 21:29:20 GMT
• Title: Characterization of Control in a Superconducting Qutrit Using Randomized Benchmarking
• Authors: M. Kononenko, M.A. Yurtalan, S. Ren, J. Shi, S. Ashhab, A. Lupascu
• Abstract summary: We characterize control of a qutrit implemented in the lowest three energy levels of a capacitively-shunted flux-biased superconducting circuit. We find that errors are due to decoherence primarily and have a significant contribution from level shifts.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We characterize control of a qutrit implemented in the lowest three energy levels of a capacitively-shunted flux-biased superconducting circuit. Randomized benchmarking over the qutrit Clifford group yields an average fidelity of 98.89 $\pm$ 0.05%. For a selected subset of the Clifford group, we perform quantum process tomography and observe the behaviour of repeated gate sequences. Each qutrit gate is generated using only two-state rotations via a method applicable to any unitary. We find that errors are due to decoherence primarily and have a significant contribution from level shifts. This work demonstrates high-fidelity qutrit control and outlines avenues for future work on optimal control of superconducting qudits.

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