Visualising entanglement in atoms.

In this work we show how new phase space methods lead to a more complete visualisation of quantum states of atoms in ways that are not possible with usual orbital methods. This method allows us to display quantum correlations (entanglement) between spin and spatial degrees of freedom (spin-orbit coupling), spin-spin degrees of freedom, and more complex combinations of spin and spatial entanglement for the first time. This is important as such properties affect the physical characteristics, and chemistry, of atoms and molecules. Our visualisations are sufficiently accessible that, with some preparation, those with a non-technical background can gain an appreciation of subtle quantum properties of atomic and other systems. By providing new insights and modelling capability, our phase space representation will be of great utility in understanding aspects of atomic physics and chemistry not available with current techniques.