Fast Frictionless Expansion of an Optical Lattice
  We investigate fast frictionless expansion of an optical lattice with dynamically variable spacing (accordion lattice). We design an expansion trajectory that yields a final state identical to the initial state up to an irrelevant phase factor. We discuss the effect of additional force and nonlinear interaction on the fast frictionless expansion. 
C. Yuce
cond-mat.quant-gas quant-ph