Entanglement dynamics in open two-qubit systems via diffusive quantum trajectories
arXiv:1006.1452 · doi:10.1103/PhysRevLett.105.210502
Abstract
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.
4 pages, 2 figures, changed title, abstract and fig. 2, corrected typos
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