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We explore the relationship between symmetrisation and entanglement throughmeasurements on few-particle systems in a multi-well potential. In particular,considering two or three trapped atoms, we measure and distinguish correlationsarising from two different physical origins: antisymmetrisation of thefermionic wavefunction and interaction between particles. We quantify thisthrough the entanglement negativity of states, and the introduction of anantisymmetric negativity, which allows us to understand the role thatsymmetrisation plays in the measured entanglement properties. We apply thisconcept both to pure theoretical states and to experimentally reconstructeddensity matrices of two or three mobile particles in an array of opticaltweezers.

Measurement of Identical Particle Entanglement and the Influence of Antisymmetrisation