Decoherence due to an excited-state quantum phase transition in a two-level boson model
Decoherence due to an excited-state quantum phase transition in a two-level boson model
The decoherence induced on a single qubit by its interaction with the environment is studied. The environment is modeled as a scalar two-level boson system that can go through either first-order or continuous-excited-state quantum phase transitions, depending on the values of the control parameters. A mean-field method based on the …