Example

This is a short example note. I would use this format for a small calculation, a useful physics idea, or a thought that is not yet a full paper. Setup Suppose a quantum state \(\rho_{ABC}\) is defined on three regions. A useful quantity is the conditional mutual information \[ I(A:C|B)_\rho = S(AB)_\rho + S(BC)_\rho - S(B)_\rho - S(ABC)_\rho . \]It measures how much correlation remains between \(A\) and \(C\) once the region \(B\) is known. ...