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Purifying entanglement of noisy two-qubit states via entanglement swapping

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arxiv 1306.4451 v4 pith:NS4VTG3L submitted 2013-06-19 quant-ph

Purifying entanglement of noisy two-qubit states via entanglement swapping

classification quant-ph
keywords entanglementstatesentangledswappingtwo-qubitamplitudeasymptoticallychange
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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