Contrary to intuition, photons do not have to be indistinguishable for maximum photon bunching to occur. Partially indistinguishable photons can exhibit pronounced bunching.
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Andrea Crespi
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Crespi, A. Dissimilar photons can bunch too. Nat. Photon. 17, 641–642 (2023). https://doi.org/10.1038/s41566-023-01258-1
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DOI: https://doi.org/10.1038/s41566-023-01258-1
