Margolus–Levitin theorem

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The Margolus–Levitin theorem, named for Norman Margolus and Lev B. Levitin, gives a fundamental limit on quantum computation (strictly speaking on all forms on computation). The processing rate cannot be higher than 6 × 1033 operations per second per joule of energy. Or stating the bound for one bit:

A quantum system of energy E needs at least a time of to go from one state to an orthogonal state, where h is Planck's constant (6.626 × 10−34 J·s) and E is average energy.

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