For example, a esemble of 50% spin up and 50% spin down electrons, the other of 25% spin up,25% spin down, 25% x direction spin up and 25% x direction spin down. The density matrix is identity matrix for both(correct me if i'm wrong), is there any way to distinguish the two experimentally?(adsbygoogle = window.adsbygoogle || []).push({});

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# Any observable difference between two ensembles described by a same density matrix.

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