Quantum cellular automaton
= Quantum cellular automaton
{wiki=Quantum_cellular_automaton}
A **quantum cellular automaton (QCA)** extends the classical concept of cellular automata into the realm of quantum mechanics. In a traditional cellular automaton, a grid of cells can be in one of several states and evolves over discrete time steps according to a set of rules based on the states of neighboring cells. These rules are deterministic and depend on classical physics.