# Margolus–Levitin theorem

> theorem that gives a fundamental limit on quantum computation: a quantum system of energy 𝐸 needs at least a time of ℎ/4𝐸 to go from one state to an orthogonal state

**Wikidata**: [Q1895360](https://www.wikidata.org/wiki/Q1895360)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Quantum_speed_limit_theorems)  
**Source**: https://4ort.xyz/entity/margolus-levitin-theorem