Time- and phase-resolved emulation of sign-selective counterdiabatic dynamics in a superconducting qutrit

arXiv:2611.08913v1 Announce Type: new Abstract: In cyclic three-level systems, phase-sensitive interference can convert a coupling-sign reversal into a population contrast, providing a controllable analogue of handedness. We emulate this mechanism in a superconducting transmon qutrit using two resonant single-photon drives and a phase-controlled effective two-photon drive. Effective loop phases \(\Phi_L=+\pi/2\) and \(\Phi_R=-\pi/2\), separated by \(\pi\), reverse the auxiliary contribution to the dark--bright coupling, canceling the intrinsic nonadiabatic term for \(L\) and reinforcing it for \(R\). Time-resolved trajectories reveal dark-pathway transfer for \(L\) and bright-manifold participation for \(R\). Measured late-time averages give a target-state population contrast of 0.929.