Pancharatnam phase for the Jaynes-Cummings model modified by a sudden perturbation of the two-level system
Istok P. Mendaš · Physical Review A · 2003
The geometrical (total minus dynamical) phase of generally nonadiabatic and noncyclic evolution of initial dressed states, and also arbitrary entangled states, of the two-level system coupled to a quantum oscillator is calculated in closed form. A sudden perturbation of the two-level system leads to a discontinuous phase jump at the instant when the system makes a transition from the initial state. A possible experimental verification in the field of quantum optics is proposed.