Signature of Non-Abelian to Abelian Transition in Spin Systems Through   Geometric Phase
  Abelian and Non-Abelian evolution of a quantum system manifests differently in the geometric phase acquired by the system under such evolutions. In this work we develop and study, using dressed state techniques, an experimentally realizable spin system which allows us to transit smoothly from non-Abelian to Abelian evolutions by changing externally controllable parameters. The study provides insights into the underlying physical phenomenon governing such a transition allowing us greater control on phase generation in a quantum system. The robustness of geometric phase against fluctuations of the external parameters of the system has also been studied in this work. The noise analysis has direct consequence on the present search for fault tolerant quantum gates using geometric phase. 
Debashis De Munshi and Manas Mukherjee
quant-ph