nLab
superposition

Idea

In quantum theory the state of a physical system is given by a vector in a complex vector space (usually a Hilbert space). This means that given any two states ${\psi }_1$ and ${\psi }_2$, also their sum as vectors ${\psi }_1+{\psi }_2$ is represents a state. This is called the superposition of the two states.

Related concepts

• wave function

• superselection sector

• space of states

• quantum interference

• entanglement