PHOTON AS A QUANTUM PARTICLE

摘要

Our present understanding of the nature of photons significantly differs from what has been known years ago when the concept of a photon has only been emerging. Unfortunately, very little of this knowledge trickles to those students who do not specialize in theoretical physics. In this lecture, in addition to giving a historical perspective on the "problem of the photon", I shall say something about the description of the photon as a quantum mechanical particle. In addition, I shall show how the quantum description merges with the classical description of the electromagnetic field.