Entanglement Dynamics in Open Two-Qubit Systems via Diffusive Quantum Trajectories
Carlos Viviescas, Ivonne Guevara, Andre R. R. Carvalho, Marc Busse, Andreas Buchleitner · Physical Review Letters · 2010
We use quantum diffusive trajectories to prove that the time evolution of two-qubit entanglement under spontaneous emission can be fully characterized by optimal continuous monitoring. We analytically determine this optimal unraveling and derive a deterministic evolution equation for the system's concurrence. Furthermore, we propose an experiment to monitor the entanglement dynamics in bipartite two-level systems and to determine the disentanglement time from a single trajectory.