Short cycle pulse sequence for dynamical decoupling of local fields and   dipole-dipole interactions
  We propose a new pulse sequence for dynamical averaging of the dipole-dipole interactions and inhomogeneities of the magnetic fields in the nuclear spin system. The sequence contains a short cycle of the periodic resonant pulse excitation that offers new possibilities for implementing the long-lived multi-qubit quantum memory on the condensed spin ensembles that are so important for construction of universal quantum computer and long-distance quantum communications. 
S. A. Moiseev and V. A. Skrebnev
quant-ph