  We explore the relationship between symmetrisation and entanglement through
measurements on few-particle systems in a multi-well potential. In particular,
considering two or three trapped atoms, we measure and distinguish correlations
arising from two different physical origins: antisymmetrisation of the
fermionic wavefunction and interaction between particles. We quantify this
through the entanglement negativity of states, and the introduction of an
antisymmetric negativity, which allows us to understand the role that
symmetrisation plays in the measured entanglement properties. We apply this
concept both to pure theoretical states and to experimentally reconstructed
density matrices of two or three mobile particles in an array of optical
tweezers.
