New aspects of entanglement dynamics are presented. Firstly, it is shown that two systems can be entangled via exchange of an unentangled messenger particle in a mixed state. The same result holds for two systems interacting indirectly via a third. However, for the special case of pure states, a quantitative relation can be derived between the entanglement rate of the two systems and the entanglement of the mediating system. The latter acts as a bottleneck to entanglement flow. For general many-body systems, including systems in mixed states, a set of entanglement rate equations is derived, analogous to the rate equations for a chemical reaction. These are used to prove a lower-bound on the time required to entangle distant particles. Finally, the correlation dynamics of a spin model is analysed using a fermionic gaussian state formalism, and it is shown that the correlations can be precisely controlled using only external parameters.
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New aspects of entanglement dynamics are presented. Firstly, it is shown that two systems can be entangled via exchange of an unentangled messenger particle in a mixed state. The same result holds for two systems interacting indirectly via a third. However, for the special case of pure states, a quantitative relation can be derived between the entanglement rate of the two systems and the entanglement of the mediating system. The latter acts as a bottleneck to entanglement flow. For general many-...
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