Two-qubit entanglement dynamics in a symmetry-broken environment

The temporal evolution of entanglement pertaining to qubits interacting with a thermal bath was studied. A simplest nontrival spin bath model was used for the studying the behavior of entanglement between two qubits dipped in a large symmetry-breakable fermionic environment, below the critical temperature. Mean field approximation was used in the model. The coherence free entanglement states and entangled states with an exponential decay of the quantum correlation were analyzed at finite temperature. The results show that above critical temperature, entanglement dynamics became independent of temperature and bath ordering properties.