Rapid State Transfer via All‐Microwave Scheme in Transmon Qutrit

As a crucial component of superconducting quantum computing, the three‐energy‐level quantum system, known as qutrit, along with qutrit gates, has garnered significant attention over the past decades, which highlights the significance of accomplishing state transfers between levels in multiqutrit systems as a critical task. Herein, the |fg⟩−|ge⟩$\left|\right. f g \rangle - \left|\right. g e \rangle$ coupling is constructed via the all‐microwave approach. Both the coupling strength and Alternating Current stark shift are calibrated, based on which a fast (70 ns) state transfer from |gf⟩$\left|\right. g f \rangle$ to |fg⟩$\left|\right. f g \rangle$ is investigated and achieved through the stimulated Raman shortcut‐to‐adiabatic passage. This work presents a protocol to realize a fast (70 ns) and robust state transfer between two states in the qutrits system via stimulated Raman shortcut‐to‐adiabatic passage with an all‐microwave scheme. The experimental results have proved the feasibility of the protocol and its robustness against both frequency and strength errors.