Symbol t

The passage around this formula

…that for a periodic evolution this rate integrates cleanly: a system with mean energy $\langle$ H$\rangle$-$E_0$ above its ground state can pass through at most $N \leq \frac{2}{\pi\hbar}\left(\langle H\rangle-E_0\right) t$. mutually orthogonal states in elapsed time t [ 3 ] . Lloyd used the same bound to price computation itself: no amount of clever engineering lets a system with energy E execute logical operations faster than about 2E/$\pi$$\hbar$ per second, a ceiling with nothing to do with any particular hardware [ 5 ] .

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