• Dissipation, mixing and two level system in quantum field theory 

      Bruno, Angelo (Universita degli studi di Salerno, 2012-04-30)
      In this dissertation we discuss several aspects of a two level system (qubit) in the context of quantum mechanics and quantum field theory. The presence of geometrical phases in the evolution of a qubit state is shown. We ...
    • Particle mixing, two level systems and gauge theory 

      Raimondo, Gianluca (Universita degli studi di Salerno, 2012-04-26)
      In this thesis I will discuss the theory of two level systems and the theory of the oscillating particles in quantum eld theory. In the rst chapter I will consider the time evolution of a two level system, a qubit, ...