Aspects of entanglement negativity in quantum field theory and lattice models

Logarithmic negativity quantifies quantum entanglement for bipartite mixed states. We discuss the computation of the logarithmic negativity in quantum field theory through a replica limit method, providing both analytic and numerical  results for simple 2D CFTs like the compact boson, free fermion and Ising model. Also some results on a two dimensional harmonic lattice will be discussed.