Entanglement between particle partitions in itinerant many-particle states

Understand

We review `particle partitioning entanglement' for itinerant many-particle systems.

• This is defined as the entanglement between two subsets of particles making up the system.
• We identify generic features and mechanisms of particle entanglement that are valid over whole classes of itinerant quantum systems.
• We formulate the general structure of particle entanglement in many-fermion ground states, analogous to the `area law' for the more usually studied entanglement between spatial regions.