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Purifying entanglement of noisy two-qubit states via entanglement swapping
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Purifying entanglement of noisy two-qubit states via entanglement swapping
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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.
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