Purification of two-qubit mixed states

Details Purification of two-qubit mixed states Purification of two-qubit mixed states

2002-05-17

arxiv.org/abs/quant-ph/0205107v2

Quant. Inf. Comp. 2, 348 (2002)

Physics

Quantum Physics

Small corrections. Final version

Scientific paper

We find the necessary and sufficient condition under which two two-qubit
mixed states can be purified into a pure maximally entangled state by local
operations and classical communication. The optimal protocol for such
transformation is obtained. This result leads to a necessary and sufficient
condition for the exact purification of $n$ copies of a two-qubit state.

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