Benchmarking Coherent Errors in Controlled-Phase Gates due to Spectator Qubits

• DOI: 10.1103/physrevapplied.14.024042
• Publication Date: 2020-08-17T20:44:21Z
• Authors: S. Krinner; S. Lazar; A. Remm; C.K. Andersen; N. Lacroix; G.J. Norris; C. Hellings; M. Gabureac; C. Eichler; A. Wallraff
• Keywords: Benchmarking

A major challenge in operating multi-qubit quantum processors is to mitigate coherent errors. For superconducting circuits, besides crosstalk originating from imperfect isolation of control lines, dispersive coupling between qubits a source We benchmark phase errors controlled-phase gate due either the involved one or more spectator qubits. measure associated infidelity using process tomography. In addition, we point out that, non-computational state during gate, two-qubit conditional are enhanced. Our work important for understanding limits fidelity gates with finite on/off ratio settings.