Abstract
In his famous book, The Principles of Quantum Mechanics, Dirac stated that “... photon ... interferes only with itself. Interference between two different photons never occurs.” However, two-photon interference has been demonstrated experimentally. Was Dirac wrong? We report an new experiment in this paper. It demonstrated that two-photon interference can not be considered the interference of two photons. “Two-photon” is not two photons. Two-photon is a single entity, which is just like a photon. We may call it biphoton. Dirac was correct. Biphoton interferes only with itself.
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Shih, Y.H., Strekalov, D.V., Pittman, T.D. (1998). Why Two-Photon but Not Two Photons?. In: Hunter, G., Jeffers, S., Vigier, JP. (eds) Causality and Locality in Modern Physics. Fundamental Theories of Physics, vol 97. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0990-3_49
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DOI: https://doi.org/10.1007/978-94-017-0990-3_49
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-481-5092-2
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