Related papers: CNOT gates for fluxonium qubits via selective darkening of transitions

CNOT gates for fluxonium qubits via selective darkening of transitions

URL: http://arxiv.org/abs/2202.04583v2
Date: Fri, 23 Sep 2022 21:30:25 GMT
Title: CNOT gates for fluxonium qubits via selective darkening of transitions
Authors: Konstantin N. Nesterov, Chen Wang, Vladimir E. Manucharyan, Maxim G. Vavilov
Abstract summary: We analyze the cross-resonance effect for fluxonium circuits and investigate a two-qubit gate scheme based on selective darkening of a transition. We show that gate error below $10-4$ is possible for realistic hardware parameters.
Score: 2.7080431315882967
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: We analyze the cross-resonance effect for fluxonium circuits and investigate a two-qubit gate scheme based on selective darkening of a transition. In this approach, two microwave pulses at the frequency of the target qubit are applied simultaneously with a proper ratio between their amplitudes to achieve a controlled-NOT operation. We study in detail coherent gate dynamics and calculate gate error. With nonunitary effects accounted for, we demonstrate that gate error below $10^{-4}$ is possible for realistic hardware parameters. This number is facilitated by long coherence times of computational transitions and strong anharmonicity of fluxoniums, which easily prevents excitation to higher excited states during the gate microwave drive.

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