Fig. 2: Order parameter crossover and entanglement signatures of QPT at thermodynamic equilibrium.
From: Environment induced dynamical quantum phase transitions in two-qubit Rabi model
Qubits' squared magnetization M2 (a), interaction energy between the qubits 〈HJ〉/Δ (b), von Neumann entropy Sq (c) and concurrence Cq (d) as functions of g/Δ for J = − 10Δ, computed through WLMC and DMRG. For the WLMC method the calculations are made for βΔ ∈ [100, 1000]. In panel (c), the dashed line represents the maximum von Neumann entropy for a single qubit. In panel (d), the dotted line indicates a linear fit of the concurrence performed near the transition, which intersects the g-axis at approximately the critical value.
