States dressing analysis in a transmon-transmon-bus system
arXiv:2607.11514 · doi:10.1134/S002136402660120X
The paper experimentally and analytically examines how computational states in a transmon‑transmon‑bus superconducting qubit system are dressed by non‑computational states, using three modeling approaches to assess the impact on multi‑qubit gate fidelity.
Abstract
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.