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, probability amplitude

• superselection sector

• space of states

• quantum interference

• entanglement