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A particle representing a quantum of light or other electromagnetic radiation. A photon carries energy proportional to the radiation frequency but has zero rest mass.
- ‘Until now, physicists have only been able to entangle photons, electrons and atoms, using different methods in each case.’
- ‘A photon has zero rest mass, but it carries energy and momentum.’
- ‘The team has also made progress in using photons to carry quantum information between calcium qubits.’
- ‘The world of the realist is populated by electrons and photons, quarks and gluons.’
- ‘Tiny particles such as photons or atoms can readily be put into a quantum superposition existing in two different states or places at once.’
Early 20th century: from Greek phōs, phōt- ‘light’, on the pattern of electron.
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The definitions of ‘buddy’ and ‘bro’ in the OED have recently been revised. We explore their history and increase in popularity.