From entanglement certification with quench dynamics to multipartite entanglement of interacting fermions

Understand

Multipartite entanglement, such as witnessed through the quantum Fisher information (QFI), is a crucial resource for quantum technologies, but its experimental certification is highly challenging.

• Here, we propose an experimentally friendly protocol to measure the QFI.
• It relies on recording the short-time dynamics of simple observables after a quench from a thermal state, works for spins, bosons, and fermions, and can be implemented in standard cold-atom experiments and other platforms with temporal control over the system Hamiltonian.
• To showcase the protocol, we simulate it for the one-dimensional Fermi--Hubbard model.