Reconstructed Wigner function of a superposition of two trisqueezed states. Its sixfold rotational symmetry and regions of Wigner negativity reveal highly non-classical quantum interference in the ion’s motion. Credit: Department of Physics, University of Oxford Researchers at the University of Oxford have created a new type of quantum superposition, a phenomenon often associated with the famous Schrödinger's cat thought experiment. Unlike previous versions, these newly demonstrated states are