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What is the entropy of a density matrix which is the sum of two unitarily...
ConstructionSuppose I have a density matrix $\rho$ which is proportional to a projector $P$ formed by tensoring together $N$ small projectors $P^{(i)}$ of rank 2:$P^{(i)} = |a\rangle_i\langle a| +...
View ArticleAnswer by Steve Flammia for What is the entropy of a density matrix which is...
First observation, you can unitarily rotate the first term without changing the spectrum so you can just consider a single unitary with out loss of generality. Call the rotated term $Q$.Next, it helps...
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