Classical mechanics is about what we can see with our eyes, expressed with velocity, time, and distance. However, particles, which are so small that we cannot know momentum nor position of those simultaneously have uncertainty, are the focus of quantum mechanics. Quantum mechanics explains that particles have wave and spread throughout space.
By now on, the medium area between two mechanics is considered to be represented by two mechanics because discovery of materials increases or decreases contin- uously as particles transfer from quantum to classic. In contrast, the research team observed that a nonmonotonic phenomenon appears during the transition of four photons.
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