Mixed Field Ising. Next, we consider a system composed of two Mixed Field Ising models: Nα Hα = − Σ JZαZα + gXα + hZα , α = A, B (4.18) i coupled at t = 0, by the same quench procedure as before, with an interaction Hamiltonian that connects the last site of A to the first site of B: NA Hint = −λ+−σˆ+ ⊗ σˆ1− − λ−+σˆN− ⊗ σˆ1B = − Σ ab∈{+,−} λa,bσˆa ⊗ σˆb , + 1B
