Source: wikibot/superselection
= Superselection
{wiki=Superselection}
Superselection refers to a concept in quantum mechanics that deals with the restrictions on the allowed states of a quantum system based on certain conservation laws or symmetries. Specifically, it distinguishes between different sectors or subspaces of a Hilbert space that cannot be coherently superposed, meaning that states from different superselection sectors cannot be combined into a single quantum state.