What is the difference between a photon and a quantum?
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The key difference between photon and quantum is that photon is an elementary particle, whereas quantum is a measure of quantity.
Photon is an elementary particle while quantum is a discrete packet with energy stored in it. Photon and quantum are two very important concepts in modern physics. Furthermore, these concepts are useful widely in fields such as quantum physics, quantum chemistry, electromagnetic theory, optics, particle physics, etc. These concepts are also important in many real-world applications such as LASERs, high-resolution microscopy, measurements of molecular distances, quantum cryptography, and photochemistry.
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