LANDE: Concerning “the historical origin of the dualistic interpretation” which I “have not realized:” I know of course of Einstein's light quanta in opposition to light waves. But I also know that there is a unitary quantum theory of radiation that has relegated the “photon” to the role of a quantum number attached to the periodic components of the continuous Maxwell field; thereby it has become unnecessary to attribute various ad hoc invented quantities—spin, interdependence of electric and magnetic properties of the photon—in order to save a particle picture dual to the wave picture of light. Light waves are real, matter waves are imaginary, in more than one sense.
Dialog on dualism
Alfred Landé, Max Born, Walter Biem; Dialog on dualism. Physics Today 1 August 1968; 21 (8): 55–56. https://doi.org/10.1063/1.3035103
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