12Two-Photon Interferometry–I: Biphoton Interference

Two-photon interferometry started to play an important role in quantum optics since the 1980s. In that time, Dirac was criticized to be mistaken because he stated in his book, The Principles of Quantum Mechanics, that “…photon… only interferes with itself. Interference between two different photons never occurs.” Two-photon interference was considered as the interference between two photons.

Is two-photon interference the interference of two photons? In the following discussion, we will provide a negative answer to this question: two-photon interference is not the interference between two photons. Two-photon interference is the result of the superposition of two-photon amplitudes, a nonclassical ...

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