Crosstalk Suppression in Individually Addressed Two-Qubit Gates in a Trapped-Ion Quantum Computer

• URL: http://arxiv.org/abs/2206.02703v1
• Date: Mon, 6 Jun 2022 16:00:34 GMT
• Title: Crosstalk Suppression in Individually Addressed Two-Qubit Gates in a Trapped-Ion Quantum Computer
• Authors: Chao Fang, Ye Wang, Shilin Huang, Kenneth R. Brown, Jungsang Kim
• Abstract summary: Crosstalk between target and neighboring spectator qubits due to spillover of control signals is a major error source in quantum computers. We show that in our laser-driven trapped-ion system coherent crosstalk error can be modelled as residual $Xhatsigma_phi$ interaction. We propose and demonstrate a crosstalk suppression scheme that eliminates all first-order crosstalk, yet only requires local control by driving rotations solely on the target qubits.
• Score: 3.6908685287687812
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Crosstalk between target and neighboring spectator qubits due to spillover of control signals represents a major error source limiting the fidelity of two-qubit entangling gates in quantum computers. We show that in our laser-driven trapped-ion system coherent crosstalk error can be modelled as residual $X\hat{\sigma}_{\phi}$ interaction and can be actively cancelled by single-qubit echoing pulses. We propose and demonstrate a crosstalk suppression scheme that eliminates all first-order crosstalk, yet only requires local control by driving rotations solely on the target qubits. We report a two-qubit Bell state fidelity of $99.52(6) \%$ with the echoing pulses applied after collective gates and $99.37(5) \%$ with the echoing pulses applied to each gate in a 5-ion chain. This scheme is widely applicable to other platforms with analogous interaction Hamiltonians.

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