In the Young double slit experiment it is possible to detect the arrival of individual photons as well as an interference pattern.
Yes, I rather like this picture on this Hitachi webpage myself. It's electrons rather than photons, but no matter:
It doesn't makes much sense to me that something could be either a particle either a wave, neither the use of the wave function collapse to explain individual photon observation.
It shouldn't be a big problem if you've ever looked at the optical Fourier transform, see Steven Lehar's webpage. An interaction can result in something wavelike looking pointlike:
I have therefore been reading answers to this question on stack exchange, and quite reassuringly, wave-particle duality is considered wrong. Quantum field theory is refered as the correct answer, however it is never explained in any details.
Who says wave-particle duality is wrong? A photon is a particle, but it has an E=hc/λ wave nature. Think of it as one wave. It has a wavelength, but it can look pointlike in an interaction.
What is the (advanced) layman explanation of Young experiment with QFT?
I'm not sure there is such a QFT explanation. But there may be in future. Check out weak measurement and work by Aephraim Steinberg et al. This is a depiction of a photon going through both slits:
Also check out work by Jeff Lundeen et al. I gather Aephraim used to be Jeff's supervisor. See this:
"So what does this mean? We hope that the scientific community can now improve upon the Copenhagen Interpretation, and redefine the wavefunction so that it is no longer just a mathematical tool, but rather something that can be directly measured in the laboratory".
Thinking about this paradox, I found an explanation that I believe is convincing:
there is no individual particle travelling, only waves
waves only probabilistically interact with matter (like it is the case with neutrinos)
waves have a certain probability to interact with matter which depend on the energy at a given physical location (which depend on waves superposition) and on the material used to build the detector (should not be transparent at the wavelength used by the coherent source) Is this explanation consistent with QFT?
I think so. But don't forget the wave nature of matter. You've got waves interacting with waves. Everything is fields and waves. And don't forget that optical Fourier transform. Imagine you detect a photon at slit. It gets converted into something pointlike. So it goes through that slit only, hence no interference. Then when you detect it on the screen it gets converted into something pointlike. What's the problem?