We show that the gauge theory and gravity amplitudes are related by the double copy for amplitudes on plane wave backgrounds. Consistency of these two methods is established explicitly.

We compute the back-reaction on these fields from the radiation emitted by the probe particles: classically through background-coupled worldline theories, and at tree-level in the quantum theory through three-point amplitudes. These backgrounds are treated exactly and non-perturbatively throughout. Finally, we demonstrate that in four-dimensions these calculations can be carried out with a background-dressed version of the massive spinor-helicity formalism.ДЄB - We consider radiation emitted by colour-charged and massive particles crossing strong plane wave backgrounds in gauge theory and gravity. Quantum computers have to deal with the problem of noise, which can quickly derail any calculation. We expect that translating them to quantum computers will unlock a quantum advantage. Tensor networks are the very best way to simulate many quantum systems on classical computers, says Andrew Green, a condensed-matter physicist at UCL and a co-author of the study. But before theyвЂ™re truly powerful, researchers have to overcome a number of fundamental roadblocks. On a quantum computer, however, the resources required may be greatly reduced. N2 - We consider radiation emitted by colour-charged and massive particles crossing strong plane wave backgrounds in gauge theory and gravity. Quantum computers should soon be able to beat classical computers at certain basic tasks. T1 - Classical and quantum double copy of back-reaction

Classical or quantum calculator