Journal
PHYSICAL REVIEW APPLIED
Volume 14, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.14.024042
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Funding
- Office of the Director of National Intelligence (ODNI), Intelligence Advanced Research Projects Activity (IARPA), via the U.S. Army Research Office [W911NF-16-1-0071]
- National Centre of Competence in Research Quantum Science and Technology, a research instrument of the Swiss National Science Foundation (SNSF)
- EU Flagship on Quantum Technology [H2020-FETFLAG-2018-03, 820363 OpenSuperQ]
- SNSF R'equip [206021-170731]
- ETH Zurich
- Fondation Jean-Jacques & Felicia Lopez-Loreta
- ETH Zurich Foundation
- Swiss National Science Foundation (SNF) [206021_170731] Funding Source: Swiss National Science Foundation (SNF)
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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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