Speaker: Dr. Torsten Zache (University of Innsbruck)
Title of Talk: Quantum Variational Learning of the Entanglement Hamiltonian

The experimental capabilities of quantum simulation platforms, such as ultracold atoms, Rydberg tweezer arrays and trapped ions, already allow to realise and probe a variety of model Hamiltonians. However, the development of efficient and scalable protocols to measure the entanglement properties of quantum many-body systems – as encoded in the Entanglement Hamiltonian (EH) and its eigenvalues, the Entanglement spectrum (ES) – remains an outstanding challenge.
In this talk, I will present recent progress towards learning the EH in quantum simulations using a variational quantum-classical hybrid algorithm. Our protocol is enabled by the approximate locality of the EH, which is motivated by the Bisognano-Wichmann theorem of quantum field theory. For the example of a Fermi-Hubbard model on a ladder geometry our results demonstrate the experimental feasibility of the proposed algorithm. I will further discuss the application of such protocols to topological states, where it will allow to test with existing quantum simulators the Li-Haldane conjecture that the low-lying ES is related to the conformal field theory of edge excitations.

Zoom-Link: https://zoom.us/j/99842283772?pwd=R2FBWnRyNHB4L0grYWRMbC9YUGpqdz09
Meeting-ID: 998 4228 3772
Kenncode: 808318