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Bulletin of the American Physical Society

Mode Hybridization Analysis of Bus Resonators for a Superconducting Multi-Qubit Chip

Nadia Haider, Jonathan Gnanadhas, Marc Beekman, René Vollmer, Nandini Muthusubramanian, Román Caudillo, Alessandro Bruno, David J. Michalak, Filip K. Malinowski, Cornelis Christiaan Bultink, Adel A. Elsherbini, Lester F. Lampert, Alexander Georgievic Yarovoy, Jim Clarke, L. DiCarlo

Published Mar 4, 2019• 0 citations
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High-fidelity quantum interconnection remains a critical challenge for scaling up superconducting quantum chips. Here, we realize a simple fixed coupling scheme to achieve high-fidelity two-qubit gate operation across separate superconducting quantum chips. In this scheme, qubit-qubit coupling between separate chips can be realized via exchange interaction mediated by a bus resonator. By merely tuning the frequency of a single qubit, the resonant mode of the bus resonator can be modulated, enabling high-quality and stable quantum interconnection across different chips. Consequently, the experimentally implemented two-qubit gate operations between separate chips exhibit excellent performance, with a maximum two-qubit CZ gate fidelity reaching 99.57%. This work lays a technical foundation for the realization of high-fidelity chip-to-chip quantum interconnection, which facilitates the development of large-scale superconducting quantum chips with high fidelity.
The multi-qubit gates fidelity of superconducting quantum processors can be limited due to the dressing of computational states by noncomputational ones. Here, we experimentally and analytically investigate a transmon-transmon-bus system where the computational states dressing is tunable over a broad range. We estimate the dressing using three methods: a full three-element model, an effective mode approach, and an unperturbed mode approach. The obtained results highlight the importance of the accurate estimation and control of the computational states dressing in order to optimize gates on superconducting platform.