goropikari
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goropikari
> Also, denote $E_{m+1} = I - E_1-...-E_m$. How do you ensure $E_{m+1}$ is non-negative? I think it can be negative in this definition.
If all measurement operators are square, I agree polar decomposition is sufficient. But I'm not sure whether all measurement operators are square. I haven't found any information about squareness of...