Entanglement Properties of Bipartite Two-level System
Ning Zhen-dong · Journal of Shanxi Datong University · 2012
By studying the dynamical evolution of the bipartite two-level system which interacts with external environment,we analyze the reduced density matrix for an arbitrary initial state of the bipartite two-level system.Moreover,we calculate the initial state reduced density matrix with Werner-like state.Further,we analyze quantitatively variation law of entanglement of the bipartite two-level system with the expression of Concurrence in the bosonic ohmic and bosonic supraohmic environment at zero temperature as the parameters t,r and p change.Finally,we conclude that in the same condition,entanglement sudden death time under the bosonic supraohmic environment at zero temperature is more than that under the bosonic ohmic environment at zero temperature.