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Is photon unpolarized in natural light?

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The polarization of light in natural light depends on its behavior as a wave or a particle. When a photon behaves like a wave, the light generated in a single-photon interference experiment is polarized . However, when a photon behaves like a particle, the light is unpolarized . To fully characterize completely unpolarized light, such as natural light, invariance with respect to rotation, symmetry with respect to circular polarization, and invariance with respect to phase retardation are required . The general form of classical distribution functions and density operators consistent with these conditions has been specified . The unpolarized quantum states of light have been derived using group theory, offering new insights . Type-II unpolarized light, which is a type of unpolarized light, can have a degree of polarization that approaches complete polarization for increasing mean photon numbers .

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Journal Article•DOI Anti-bunching and super-bunching photon correlations in pseudo-natural light Zhiyuan Ye, Haibo Wang, Jun Xiong, Kaige Wang - Show less +3 more 07 Jan 2022-Photonics Research 3 Citations	No, natural light has both intensity and polarization fluctuations.
Open access•Journal Article•DOI Degree of polarization of type-II unpolarized light Alfredo Luis 07 May 2007-Physical Review A 17 Citations	Yes, natural light is considered to be unpolarized.
Open access•Journal Article•DOI Unpolarized light in quantum optics Jonas Söderholm, Gunnar Björk, Alexei Trifonov - Show less +2 more 01 Oct 2001-Optics and Spectroscopy 21 Citations	No, the vacuum state is the only pure state that is unpolarized, but natural light is a mixture of different polarizations.
Journal Article•DOI Unpolarized light : classical and quantum states J. Lehner, Ulf Leonhardt, Harry Paul - Show less +2 more 01 Apr 1996-Physical Review A 64 Citations	Yes, natural light can be considered unpolarized, but it is not completely unpolarized.
Proceedings Article•DOI Partial Polarization of Light in a Single-photon Interference Experiment Mayukh Lahiri 16 Oct 2011-Frontiers in Optics	Yes, in the case of natural light, the photon is unpolarized when it behaves like a particle.

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