Cited by 147Quantum optics and atomic interactionsQuantum Mechanics and ApplicationsStrong Light-Matter Interactions

Interference between independent photons

Paul, H.·1986·Reviews of Modern Physics

Abstract

A comprehensive review is given of investigations, both theoretical and experimental, that demonstrate interference to take place even when the fields involved are produced by independent sources. The physical situation is rather different for coherent and incoherent fields. In the first case, where the sources are lasers, a conventional interference pattern can be observed which is adequately described by the classical theory. In the present paper, special attention is paid to the question of whether this interference persists when the two laser beams become strongly attenuated. In the second case, the sources are individual atoms excited by a pumping mechanism, that emit spontaneously and, hence, independently from each other. In those circumstances, no interference pattern can show up. However, it becomes evident from both the classical and the quantum-mechanical theory that interference effects can still be established by observing intensity correlations rather than the intensity itself. This point is discussed in greater detail. The pioneering experiments of Forrester, Gudmundson and Johnson, and Brown and Twiss are reviewed in this context. Especially interesting from the theoretical point of view is the case of two emitting atoms, since then the classical and the quantum-mechanical description differ significantly, the quantum theory predicting the intensity correlations to be distinctly stronger than those following from classical considerations. This specific quantum-mechanical feature is shown to be intimately connected with the corpuscular aspect of light.

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Crossref · 10.1103/revmodphys.58.209

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Authors
Paul, H.
Corresponding author
Paul, H.
Venue
Reviews of Modern Physics
Published
1986-01-01
Volume
58
Issue
1
Pages
209-231
ISSN
0034-6861 (ISSN-L)
OpenAlex
W1974304030
Cited by
147
References
45
Citations by year
2026: 1 · 2025: 6 · 2024: 5 · 2023: 3 · 2022: 3 · 2021: 7 · 2020: 4 · 2019: 8 · 2018: 5 · 2017: 4 · 2016: 5 · 2015: 6 · 2014: 4 · 2013: 5 · 2012: 5
FWCI
2.82
Type
journal article
Language
en
Open access
closed
Locations
Reviews of Modern Physics (publishedVersion)
Topics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum optics and atomic interactions
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Mechanics and Applications
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Strong Light-Matter Interactions
Keywords
photon interference, intensity correlations, spontaneous emission, laser attenuation, quantum-classical correspondence

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