Estimation for entanglement negativity of free fermions
Christopher P. Herzog, Yihong Wang · Journal of Statistical Mechanics Theory and Experiment · 2016
In this letter we study the negativity of one dimensional free fermions. We derive the general form of the symmetric term in moments of the partial transposed (reduced) density matrix, which is an algebraic function of the end points of the system. Such a path integral turns out to be a convenient tool for making estimations for the negativity.