High Q Cavity Induced Fluxon Bunching in Inductively Coupled Josephson   Junctions
  We consider fluxon dynamics in a stack of inductively coupled long Josephson junctions connected capacitively to a common resonant cavity at one of the boundaries. We study, through theoretical and numerical analysis, the possibility for the cavity to induce a transition from the energetically favored state of spatially separated shuttling fluxons in the different junctions to a high velocity, high energy state of identical fluxon modes. 
S{\o}ren Madsen and Niels Gr{\o}nbech-Jensen and Niels Falsig Pedersen   and Peter L. Christiansen