Time- and phase-resolved emulation of sign-selective counterdiabatic dynamics in a superconducting qutrit
arXiv:2611.08913 · doi:10.1063/5.0356356
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 \(Φ_L=+π/2\) and \(Φ_R=-π/2\), separated by \(π\), 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. Loop-phase measurements establish phase selectivity, while pulse-area and common-mode amplitude scans characterize the operating regime and control sensitivity. These results provide direct time- and phase-domain access to sign-selective counterdiabatic interference in a programmable cyclic qutrit.
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