Solvable multistate model of Landau-Zener transitions in cavity QED
  We consider the model of a single optical cavity mode interacting with two-level systems (spins) driven by a linearly time-dependent field. When this field passes through values at which spin energy level splittings become comparable to spin coupling to the optical mode, a cascade of Landau-Zener (LZ) transitions leads to co-flips of spins in exchange for photons of the cavity. We derive exact transition probabilities between different diabatic states induced by such a sweep of the field. 
Nikolai A. Sinitsyn and Fuxiang Li
cond-mat.mes-hall math-ph math.MP quant-ph