New quantum technology combines free electrons and photons

https://phys.org/news/2022-08-quantum-technology-combines-free-electrons.html

"When electron scatters... electron loses exactly the amount of energy that the photon requires to be created virtually from nothing in the resonator. As a result, the two particles are coupled through their interaction and form a pair." With an improved measurement method, the physicists could precisely detect the individual particles involved and their simultaneous manifestation... only measure one particle to obtain information about the energy content and temporal appearance of second one"