Extracting Universal Entanglement Scaling from Mixed Fermionic Gaussian States via Entanglement Projected Entropy (opens in new tab)

Identifying spatial quantum correlations in mixed states is challenging because thermal mixed-state contributions obscure the entanglement encoded in subsystem entropy. Here, we introduce the entanglement projected entropy, a diagnostic for extracting boundary-sensitive quantum correlations from mixed fermionic Gaussian states. By resolving subsystem entropy into Gaussian entanglement channels and projecting their purification partners onto th...