Researchers at Max Planck Institute for the Science of Light and Friedrich Alexander University in Erlangen, Germany have recently demonstrated that a molecule can be turned into a coherent two-level quantum system. In their study, published in Nature Physics, they placed an organic molecule inside an optical microcavity and found that it behaved as a coherent two-level quantum system.
Source: https://phys.org/news/2019-03-molecule-coherent-two-level-quantum.html