Purifying entanglement of noisy two-qubit states via entanglement swapping
Wei Song, Ming Yang, Zhuo‐Liang Cao · Physical Review A · 2014
Two qubits in pure entangled states going through separate paths and interacting with their own individual environments will gradually lose 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. Some initial states can be asymptotically purified into maximally entangled states by iteratively using our protocol.