Stimulated wave of polarization in spin chains
  Stimulated wave of polarization, triggered by a flip of a single spin, presents a simple model of quantum amplification. Previously, it has been found that such wave can be excited in a 1D Ising chain with nearest-neighbor interactions, irradiated by a weak resonant transverse field. Here we explore models with more realistic Hamiltonians, in particular, with natural dipole-dipole interactions. Results of simulations for 1D spin chains and rings with up to nine spins are presented. 
G.B. Furman, S.D. Goren, J.-S. Lee, A.K. Khitrin, V.M. Meerovich, and   V.L. Sokolovsky