Measurement of identical particle entanglement and the influence of antisymmetrization

Becher, J. H. and Sindici, E. and Klemt, R. and Jochim, S. and Daley, A. J. and Preiss, P. M. (2020) Measurement of identical particle entanglement and the influence of antisymmetrization. Physical Review Letters, 125 (18). 180402. ISSN 1079-7114 (

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We explore the relationship between symmetrization and entanglement through measurements on few-particle systems in a multiwell potential. In particular, considering two or three trapped atoms, we measure and distinguish correlations arising from two different physical origins: antisymmetrization of the fermionic wave function 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 symmetrization 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.