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Does anybody know of any calculation of the concurrence for some mixed state other than the qubit-qubit case (which was solved by Wootters)?

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In a related question, does anybody know of "efficient" numerical algorithms to actually do the numerical optimization associated with the calculation of the concurrence for a mixed density matrix (other than for the qubit-qubit case)? –  Nicolás Quesada Oct 16 '12 at 17:34
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