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Is photon is unpolarized in natural light?

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Yes, photons in natural light can be unpolarized. In one study, it was shown that when a photon behaves like a particle, the light generated in a single-photon interference experiment is unpolarized . Additionally, another study discussed the polarization fluctuation of natural light and how it can be modulated. It was found that the polarization fluctuation can have a symmetric Bernoulli distribution, which means that the second-order correlation coefficient can be in principle from 0 to unlimitedly large . Therefore, the degree of polarization of type-II unpolarized light can be determined, and it can be arbitrarily large, approaching complete polarization for increasing mean photon numbers .

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Journal Article•DOI Is the photon paramagnetic H. Pérez Rojas, E. Rodriguez Querts - Show less +1 more 01 May 2009-Physical Review D 17 Citations	The paper does not provide information about the polarization of photons in natural light.
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.
Book Chapter•DOI Natural Polarized Light and Vision Talbot H. Waterman 01 Jan 1984 31 Citations	No, natural light is partially linearly polarized due to primary scattering and selective reflection.
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, indicating that photons in natural light are not 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.

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