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For questions centred around or involving the notion of partial trace. The partial trace is a generalization of the notion of trace defined for multipartite systems.

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$\frac{s}{2}|0\rangle\langle1|\otimes|0\rangle\langle1|+\frac{s}{2}|1\rangle\langle0|\otimes|1\rangle\langle0|$ should disappear when you take the trace over them, as $\langle0|1\rangle$ and $\langle1 …
answered Dec 20 '20 by GaussStrife