The "you need to travel the distance between states" speed limit on quantum computation is called the Margolus-Levitin Theorem [1]. 1: https://en.wikipedia.org

The "you need to travel the distance between states" speed limit on quantum computation is called the Margolus-Levitin Theorem [1]. 1: https://en.wikipedia.org/wiki/Margolus%E2%80%93Levitin_theorem https://en.wikipedia.org/wiki/Margolus%E2%80%93Levitin_theor...