'Tipping point' between quantum and classical worlds identified

If we are ever to fully harness the power of light for use in optical devices, it is necessary to understand photons -- the fundamental unit of light. Achieving such understanding, however, is easier said than done. That's because the physical behavior of photons -- similar to electrons and other sub-atomic particles -- is characterized not by classical physics, but by quantum mechanics. Now, scientists have observed the point at which classical and quantum behavior converge.

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