Abstract. It is shown that a solitary quantum system (photon, electron) when passing through two open slits could interfere because of the real de Broglie's wave which "guide" the particle to well-defined directions. A comparison between classical waves and particle waves can show the essential differences in the interpretations of interference phenomenon of the particles known up to now. New experiments are proposed which could distinguish between the classical electromagnetic waves and the photon-solitons. These experiments are simple, effective and decisive because they can change our understanding of nature.

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