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Latest revision as of 22:05, 20 May 2026
photon is a Book II topic in the Quantum Collection. A quantum photon is the elementary quantum of the electromagnetic field. It is a massless, electrically neutral spin-1 boson carrying energy, momentum, and polarization. Photons connect the wave description of electromagnetic radiation with particle-like absorption and emission events. A quantum photon is the elementary quantum of the electromagnetic field. It is a massless, electrically neutral spin-1 boson carrying energy, momentum, and polarization. Photons connect the wave description of electromagnetic radiation with particle-like absorption and emission events. In quantum electrodynamics, the photon is the gauge boson associated with electromagnetic interactions. A photon state can be described by frequency, momentum, helicity or polarization, and occupation number. Its energy is proportional to frequency, and in vacuum it propagates at the speed of light.
Quantum description
In quantum electrodynamics, the photon is the gauge boson associated with electromagnetic interactions. A photon state can be described by frequency, momentum, helicity or polarization, and occupation number. Its energy is proportional to frequency, and in vacuum it propagates at the speed of light.[1]
Wave-particle behavior
Single-photon experiments show interference, diffraction, and discrete detection events. The photon concept is therefore not a classical particle picture but a quantum-field description whose measurements may appear localized while amplitudes propagate and interfere.
Role in physics
Photons mediate electromagnetic forces, carry information in spectroscopy and astronomy, and are central to lasers, optics, radiation processes, quantum communication, and quantum measurement.[2]
Description
photon is a matter-scale concept used to organize how quantum theory describes atoms, particles, fields, condensed matter, plasma, or spacetime-related systems. In the Quantum Collection it is placed by scale so the reader can move from materials and molecules down to subatomic degrees of freedom.
Quantum context
At this scale, the relevant behavior is controlled by quantized states, interactions, conservation laws, and the way excitations or particles are observed. The concept is normally linked to measurable properties such as energy, momentum, charge, spin, spectra, scattering rates, or collective modes.
Role in the collection
This page provides a compact reference point for related pages in Book II. It should be read together with nearby matter-scale topics and the corresponding foundations in quantum mechanics.[3]
See also
Table of contents (84 articles)
Index
Full contents
References
- ↑ Schwartz, Matthew D. (2014). Quantum Field Theory and the Standard Model. Cambridge University Press. ISBN 978-1-107-03473-0.
- ↑ Griffiths, David J. (2008). Introduction to Elementary Particles (2nd ed.). Wiley-VCH. ISBN 978-3-527-40601-2.
- ↑ "Quantum mechanics". https://en.wikipedia.org/wiki/Quantum_mechanics.
Source attribution: Physics:Quantum photon