Comparative Analysis of Control Strategies
  Different ways of modelling quantum control systems, formulating control problems and solving the resulting problems are considered and compared. In particular, we compare the performance of geometric and optimal control, as well as iterative techniques for optimal control design versus local gradient optimization using a Lyapunov-type potential function for two problems of general interest: global control of qubits and entanglement generation in the form of Bell state preparation. 
Sonia G Schirmer and Peter J Pemberton-Ross and Xiaoting Wang