Benchmarking Coherent Errors in Controlled-Phase Gates due to Spectator Qubits
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Date
2020-08
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Journal Article
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Abstract
A major challenge in operating multiqubit quantum processors is to mitigate multiqubit coherent errors. For superconducting circuits, besides crosstalk originating from imperfect isolation of control lines, dis-persive coupling between qubits is a major source of multiqubit coherent errors. We benchmark phase errors in a controlled-phase gate due to dispersive coupling of either of the qubits involved in the gate to one or more spectator qubits. We measure the associated gate infidelity using quantum-process tomog-raphy. We point out that, due to coupling of the gate qubits to a noncomputational state during the gate, two-qubit conditional-phase errors are enhanced. Our work is important for understanding limits to the fidelity of two-qubit gates with finite on -off ratio in multiqubit settings.
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published
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14 (2)
Pages / Article No.
24042
Publisher
American Physical Society
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03720 - Wallraff, Andreas / Wallraff, Andreas
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Funding
820363 - An Open Superconducting Quantum Computer (EC)
170731 - 10 Millikelvin Cryostat for Quantum Science with Tens to Hundreds of Superconducting Qubits (SNF)
170731 - 10 Millikelvin Cryostat for Quantum Science with Tens to Hundreds of Superconducting Qubits (SNF)
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