量子大水文

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一起來猜猜看下面這些是甚麼東西

$$ D_t = \sum_x \left\| \psi_t^x - \psi_t^0\right\| $$

$$ \begin{align*} D(\rho, \sigma) &= \max_P\ \text{tr}(P(\rho - \sigma))\\ D(\rho, \sigma) &= \max_{\{E_m\}} D(p_m, q_m)\\ F(\rho, \sigma) &= \max_{\ket{\psi}, \ket{\varphi}}\, \left| \langle \psi | \varphi \rangle\right|\\ F(\rho, \sigma) &= \min_{\{E_m\}} F(p_m, q_m)\\ \end{align*} $$