(a) Schematic illustration of quantum thermal transport in the three-level system (|±〉_η and |0〉) contacting with the l-th and m-th thermal baths; (b) steady state heat currents by modulating the temperature bias T_l – T_m, which have different order approximations with α_m = 0.02; (c) steady state heat currents by tuning the temperature bias T_l – T_m with various system–middle bath coupling strengthes. The temperature of the left thermal bath is T_l = 2, and the other parameters are the same as those in Fig. 5.