I couldn't dig up the original article, but I wouldn't be too surprised if the images were in fact millimetres in size.
The images are of electrons scattered from hydrogen atoms, directed onto a plate by an electromagnet. The scattering almost certainly has a lens effect, similar to shining a torch at a mirror ball. From the article:
the team fired two lasers at hydrogen atoms inside a chamber, kicking off electrons at speeds and directions that depended on their underlying wave functions.
A strong electric field inside the chamber guided the electrons to positions on a planar detector that depended on their initial velocities rather than on their initial positions.
The images are of electrons scattered from hydrogen atoms, directed onto a plate by an electromagnet. The scattering almost certainly has a lens effect, similar to shining a torch at a mirror ball. From the article:
the team fired two lasers at hydrogen atoms inside a chamber, kicking off electrons at speeds and directions that depended on their underlying wave functions.
A strong electric field inside the chamber guided the electrons to positions on a planar detector that depended on their initial velocities rather than on their initial positions.