# Margolus–Levitin theorem

(Redirected from Margolus-Levitin theorem)
A quantum system of energy E needs at least a time of ${\displaystyle {\frac {h}{4E}}}$ to go from one state to an orthogonal state, where h = 6.626 × 10−34 J·s is Planck's constant and E is average energy.