Though it doesn't resolve whether a "quanta" is a particle or a measurable convergence of waves,
Electrons and Photons are observed with high speed imaging.
QFT is not yet reconciled with (n-body) [quantum] gravity, which it has 100% error in oredicting. random chance. TOD
IIRC, QFT cannot explain why superfluid helium walks up the sides of a container against gravity, given the mass of each particle/wave of the superfluid and of the beaker and the earth, sun, and moon; though we say that gravity at any given point is the net sum of directional vectors acting upon said given point, or actually gravitational waves with phase and amplitude.
"Quantum microscopy study makes electrons visible in slow motion" https://news.ycombinator.com/item?id=40981054
There exist single photon emitters and single photon detectors.
Qualify that there are single photons if there are single photon emitters:
Single-photon source: https://en.wikipedia.org/wiki/Single-photon_source
QFT is not yet reconciled with (n-body) [quantum] gravity, which it has 100% error in oredicting. random chance. TOD
IIRC, QFT cannot explain why superfluid helium walks up the sides of a container against gravity, given the mass of each particle/wave of the superfluid and of the beaker and the earth, sun, and moon; though we say that gravity at any given point is the net sum of directional vectors acting upon said given point, or actually gravitational waves with phase and amplitude.
You said "gauge theory",
"Topological gauge theory of vortices in type-III superconductors" https://news.ycombinator.com/item?id=41803662
From https://news.ycombinator.com/context?id=43081303 .. https://news.ycombinator.com/item?id=43310933 :
> Probably not gauge symmetry there, then.