Unifying quantum heat transfer and superradiant signature in a nonequilibrium collective-qubit system: A polaron-transformed Redfield approach

Chen Xu-Min¹, Wang Chen^{2, †}

Comparisons of steady state current fluctuations based on the NE-PTRE with counterparts within the Redfield and NIBA schemes: (a)–(c) at resonance (ε=0) and (d)–(f) at off-resonance (ε=1), by tuning qubit–bath coupling strength α. The other parameters are N_s=2, Δ=1, ω_c=6, T_L=1.5, and T_R=0.5.