Bloch sphere: $D_{ij}=\mathrm{tr}(\hat P_i\hat P_j)$ for $N=2$ with $a=b=c=\tfrac12$ · Prove2Me

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Bloch sphere: $D_{ij}=\mathrm{tr}(\hat P_i\hat P_j)$ for $N=2$ with $a=b=c=\tfrac12$ · Prove2Me