QEDexperiment

QEDexperiment is an international research program dedicated to experimental tests of quantum electrodynamics (QED) and related phenomena through high-precision measurements. It integrates atomic, optical, and condensed-miscipline techniques to study radiative corrections, vacuum fluctuations, and light–matter interactions in simple systems and controlled environments.

The project was established in 2014 by a consortium of universities and national laboratories to coordinate multiple experimental lines, including trapped-particle measurements of the electron and positron g-2, high-resolution spectroscopy of hydrogen and positronium, and cavity quantum electrodynamics experiments with superconducting resonators.

Key methods involve Penning- and ion-trap platforms, laser frequency comb spectroscopy, cryogenic microwave cavities, and ultra-stable lasers. Experimental control emphasizes minimization of systematic uncertainties, cross-checks between independent setups, and rigorous calibration of fundamental constants.

Notable results include measurements of the electron anomalous magnetic moment that agree with QED predictions at the 10^-12 level, refined determinations of the Lamb shift in simple atoms, and constraints on possible new physics affecting radiative corrections. The program has also driven advances in metrology, quantum sensing, and precision spectroscopy, with broader impact on fundamental constants and tests of the Standard Model.

Future directions focus on pushing sensitivity to new regimes, upgrading trap and cavity technologies, and extending QEDtests to more complex bound systems and strong-field environments.