Thanks to a semi classical model, we recently succeeded in providing a comprehensive solution to vacuum electromagnetic friction on rotating atoms at any distance and temperature. The same model is also shown to retrieve known results on interatomic conservative forces due to quantum fluctuations (London, Casimir-Polder). The goal of the internship, and follow-on PhD contract, is to include interaction with virtual pairs of particle-antiparticle among the fluctuations sources. During the internsip, one will look for a first route towards including this effect in the semi-classical model, and give a first estimate of the order of magnitude of friction forces. Internship starting date : Spring 2026 / PhD potential starting date : Autumn 2026