Schrödinger-Cat States in Landau–Zener–Stückelberg–Majorana Interferometry: A Multiple Davydov Ansatz Approach

Employing the time-dependent variational principle combined with the multiple Davydov D2 Ansatz, we investigate Landau–Zener (LZ) transitions in a qubit coupled to a photon mode with various initial photon states at zero temperature. Thanks to the multiple Davydov trial states, exact photonic dynamics taking place in the course of the LZ transition is also studied efficiently. With the qubit driven by a linear external field and the photon mode...