quantum electrodynamics singular noun

A relativistic quantum theory of electromagnetic interactions

quantum field theory noun

The overall theory of fundamental particles and their interactions

quantum gravity noun

An area of theoretical physics that seeks to unify gravitational physics with quantum field theory

quantum jump or quantum leap noun

1. The sudden transition of an electron, atom, etc from one energy state to another
2. A sudden spectacular advance, esp one which dramatically skips over intermediate stages of understanding or development

quantum mechanics singular noun

A branch of mechanics based on the quantum theory, used in predicting the behaviour of elementary particles

quantum number noun

1. Any of a set of integers or half-integers which together describe the state of a particle or system of particles
2. The principal quantum number, for instance, specifies the electron shell in an atom that an electron occupies

quantum physics singular noun

The branch of physics concerned with quantum theory and its effects

quantum state noun

The state of a system expressed in terms of quantum numbers

quantum theory noun

A theory, developed by Max Planck, of the emission and absorption of energy not continuously but in finite quanta

quantum yield see quantum efficiency above.