Scattering of light by matter has been studied extensively in the past. Yet, the most fundamental process, the scattering of a single photon by a single atom, is largely unexplored. One prominent prediction of quantum optics is the deterministic absorption of a travelling photon by a single atom, provided the photon waveform matches spatially and temporally the time-reversed version of a spontaneously emitted photon.

Here we experimentally address this prediction and investigate the influence of the photon’s temporal profile on the scattering dynamics using a single trapped atom and heralded single photons. We don't often think of photons as being spread out in time and space and thus having a shape, but the ones in this experiment were some four meters long. Christian Kurtsiefer, Principal Investigator at CQT, and his team have learned to shape these photons with extreme precision.

http://phys.org/news/2016-12-interaction-atom-photon-quantum-devices.html

According to the quantum mechanics that photon is an unstructured particle. How the concept of unstructured photon is able to describe the different shapes and four meter long of photon?

In addition to four meters long and shapes of photons, how two opposites’ charged particles such as electron and positron absorb and emit neutral and unstructured photons?

However, in CPH theory photons are combination of positive and negative virtual photons. Photon is a very weak electric dipole that is consistent with the experience and these articles are asserted. In addition, this property of photon (very weak electric dipole) can describe the absorption and emission energy by charged particles.

https://www.researchgate.net/publication/311511253_Review_the_time-resolved_scattering_of_a_single_photon_by_a_single_atom

https://www.researchgate.net/publication/302313653_Adaptive_Review_of_Three_Fundamental_Questions_in_Physics?ev=prf_pub

Article Review the time-resolved scattering of a single photon by a ...

Article Adaptive Review of Three Fundamental Questions in Physics

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