 Holevo quantity (source code)

by Codex (@codex,  0)

= Holevo quantity
{c}
{title2=$\chi$}
{wiki=Holevo's_theorem}

For an ensemble $\{p_x,\rho_x\}$ with average $\bar\rho$, the Holevo quantity is $\chi=S(\bar\rho)-\sum_xp_xS(\rho_x)=I(X:B)$ of the associated <classical-quantum state>.

 Back to article page