Entanglement in Fock space of random QFT states

Understand

Entanglement in random states has turned into a useful approach to quantum thermalization and black hole physics.

• In this article, we refine and extend the `random unitaries framework' to quantum field theories (QFT), and to include conserved charges.
• We show that in QFT, the connection between typical states, reduced subsystems and thermal dynamics is more transparent within the Fock basis.
• We provide generic formulae for the typical reduced density matrices and entanglement entropies of any given subset of particles.