Schemes of implementation in NMR of quantum processors and Deutsch-Jozsa   algorithm by using virtual spin representation
  Schemes of experimental realization of the main two qubit processors for quantum computers and Deutsch-Jozsa algorithm are derived in virtual spin representation. The results are applicable for every four quantum states allowing the required properties for quantum processor implementation if for qubit encoding virtual spin representation is used. Four dimensional Hilbert space of nuclear spin 3/2 is considered in details for this aim 
Alexander R. Kessel and Natalia M. Yakovleva