An unexpected delay in a standard quantum optical process generates pairs of photons
(Feynman diagram calculations rely heavily on perturbation ... increasingly complicated type of SPDC photon scattering. The ...
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A new calculation of the electron's self-energy improves determination of fundamental constants
The effect was first detected by Willis Lamb and Robert Retherford in 1947, with the emitted photon having a frequency ... and it's easiest via Feynman diagrams. "Two-loops" refers to the Feynman ...