AC stark effect in a trimon qubit

Abstract

This thesis studies the drive-induced AC Stark effects in a trimon by construct a Python simulator of Hann-shaped, area-locked pulses. A minimal experiment of two three-pulse loops (pi/2–pi–pi), played in opposite orders reveals a loop phase asymmetry Delta_phi that we decompose into detuning and Stark parts in a consistent drive frame. Across Rabi cap sweeps, a simulated "detune-VZ" residual matches a calculated Stark-only phase obtained by integrates standard three-level formulas and validate that the post-VZ asymmetry is AC Stark. We quantify leakage P_leak. show it grows monotonically with peak power, and demonstrate substantial suppression with Derivative Removal by Adiabatic Gate (DRAG) (beta approx 0.5–1), which also improves Z-invariant fidelities at high caps. The results provide a practical solution including pulse shaping, moderate DRAG, and software VZ for restore loop symmetry and limit leakage in trimon-style control.