Post measurement bipartite entanglement entropy in conformal field theories

M. A. Rajabpour

Published 2015-01-30Version 1

We derive exact formulas for bipartite von Neumann entanglement entropy after partial measurement in $1+1$ dimensional conformal field theories with periodic and open boundary conditions. After carefully defining the measurement set up we will check the validity of our results in the case of Klein-Gordon field theory (coupled harmonic oscillators) and spin-$1/2$ XX chain in a magnetic field. The agreement between analytical results and the numerical calculations is very good.