Physical Science International Journal

The interpretation of single-photon double slit Wheeler's delayed choice experiment leads to a weird inference: "what observer does now can change what happened in the past". It subverts our cognitions. Other interpretations are also in dispute. I try to find another possible way that can better explain the experiments. For this purpose, we try to reacquaint what is a photon; what structure it possesses, and how the structure influences photon behavior. In 1905 Einstein supposed that the photon is a quantum of EM radiation; according to the quantum interpretation, the probability density of a coherent state undergoes a sinusoidal vibration with time; it will also excite a quantized EM wave. So we start our research from an axially symmetric EM wave beam. We discovered and proved that under the Quantification Law of Charge, there is a kind of axially symmetric EM-wave beam which is a quantum of circularly polarized light. Its energy is concentrated in a very small packet; this energy packet will be proven to have photon properties, like,, spin , obeying B-E statistics, etc. On the other hand, the width of the sodium spectral lines identifies that the energy packet carries a long EM wave beam. They form a wave-particle hybrid structure. It exhibits both wave property and particle property all the time in the experiments. Its interpretation for the single photon double slits Wheeler's delayed choice experiment does not lead to the above strange inference.