1306.4451 (Wei Song et al.)

Enhancing entanglement of noisy two-qubit states via entanglement
swapping    [PDF]

Wei Song, Zhuo-Liang Cao

We consider the two-qubit pure entangled states go through separate paths and interact with their own individual environments, gradually losing their entanglement. Here we show that the entanglement change of a two-qubit state due to amplitude damping noises can be recovered by entanglement swapping. For some initial states, by repeatedly using our protocol the final state can be purified into a maximally entangled states.

View original: http://arxiv.org/abs/1306.4451