Complete conditions for entanglement transfer

Abstract

We investigate the conditions to entangle two qubits interacting with local environments driven by a continuous-variable correlated field. We find the conditions to transfer the entanglement from the driving field to the qubits both in dynamical and steady-state cases. We see how the quantum correlations initially present in the driving field play a critical role in the entanglement-transfer process. The system we treat is general enough to be adapted to different physical setups.

4 pages,3 figures, RevTeX4. To be published in Phys. Rev. Lett. This supersedes quant-ph/0310031 but we leave this as it has its own merit