Figure 1

The bound of Eq. (5) on concurrence (crosses) for initially pure states that evolve according to spontaneous decay as a function of time (scaled with the decay constant $\Gamma$). The solid lines show the exact value of concurrence [(a) and (b)], respectively a lower bound [(c) and (d)]. (a) and (b) correspond to two different states of a bipartite qubit systems, both of which are initially nonmaximally entangled. (c) and (d) correspond to two different initially maximally entangled states of a bipartite qutrit system.Reuse & Permissions