A Complete Classification of Quantum Ensembles Having a Given Density Matrix
作者： Lane P. Hughston , Richard Jozsa , William K. Wootters
DOI: 10.1016/0375-9601(93)90880-9
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摘要: … all discrete ensembles of pure quantum states having a given density matrix. As a special case … We also show that any chosen ensemble consistent with a fixed density matrix p can be …
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