Physics:Quantum photon
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.[1][2]
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.[3]
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.[4]
See also
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References
- ↑ Einstein, Albert (1905). "On a heuristic point of view concerning the production and transformation of light". Annalen der Physik 322 (6): 132-148. doi:10.1002/andp.19053220607.
- ↑ Particle Data Group (2022). "Review of Particle Physics". Progress of Theoretical and Experimental Physics 2022 (8): 083C01. doi:10.1093/ptep/ptac097.
- ↑ 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.
Source attribution: Photon