Bound entanglement represents an irreversible form of quantum correlation: bound-entangled states require entanglement for their preparation, but no pure-state entanglement can be extracted from them. A recent experiment reports the first experimental realization of a bound-entangled state.
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Acín, A. Entangled and bound. Nature Phys 5, 711–712 (2009). https://doi.org/10.1038/nphys1401
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DOI: https://doi.org/10.1038/nphys1401
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