Stability and decoherence of optical bipolaron in symmetric quantum dot A. J. Fotue, J.-R. D. Djomou, S. C. Kenfack, M. F. C. Fobasso and L. C. Fai Eur. Phys. J. Plus, 135 10 (2020) 838 Published online: 16 October 2020 DOI: 10.1140/epjp/s13360-020-00835-5