Thursday, June 20, 2013

1306.4451 (Wei Song et al.)

Enhancing entanglement of noisy two-qubit states via entanglement

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.
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