Measuring Fermionic Entanglement: Entropy, Negativity, and Spin Structure

Understand

The recent direct experimental measurement of quantum entanglement paves the way towards a better understanding of many-body quantum systems and their correlations.

• Nevertheless, the experimental and theoretical advances had so far been predominantly limited to bosonic systems.
• Here, we study fermionic systems.
• Using experimental setups where multiple copies of the same state are prepared, arbitrary order Renyi entanglement entropies and entanglement negativities can be extracted by utilizing spatially-uniform beam splitters and on-site occupation measurement.