Abstract
We study a scheme of thermal management where a three-qubit system assisted with a coherent auxiliary bath (CAB) is employed to implement heat management on a target thermal bath (TTB). We consider the CAB/TTB being ensemble of coherent/thermal two-level atoms (TLAs), and within the framework of collision model investigate the characteristics of steady heat current (also called target heat current (THC)) between the system and the TTB. It demonstrates that with the help of the quantum coherence of ancillae the magnitude and direction of heat current can be controlled only by adjusting the coupling strength of system-CAB. Meanwhile, we also show that the influences of quantum coherence of ancillae on the heat current strongly depend on the coupling strength of system—CAB, and the THC becomes positively/negatively correlated with the coherence magnitude of ancillae when the coupling strength below/over some critical value. Besides, the system with the CAB could serve as a multifunctional device integrating the thermal functions of heat amplifier, suppressor, switcher and refrigerator, while with thermal auxiliary bath it can only work as a thermal suppressor. Our work provides a new perspective for the design of multifunctional thermal device utilizing the resource of quantum coherence from the CAB.
Highlights
Quantum thermodynamics mainly studies thermodynamic behaviors emerging in systems that are quantum in nature [1,2,3,4]
With respect to the characteristics of Jmax,min above, one can infer that the quantum machine assisted with coherent auxiliary bath (CAB) can always work as a heat amplifier or a suppressor by tuning the coupling strength λ L and satisfied as J (λ L), λ L ∈ [0, π/2], due to both regions of heat pump amplification region (HPAR) and heat pump suppression region (HPSR) being covered in the full parametric space, (α, θ), of coherence
We have proposed a scheme of heat modulation via a three-partite system assisted with a CAB to control the magnitude and the direction of heat current between the system and the target thermal bath (TTB)
Summary
Quantum thermodynamics mainly studies thermodynamic behaviors emerging in systems that are quantum in nature [1,2,3,4]. Is first implemented in M1 process; the subsystems Sa and Sc are coupled to the nth ancilla (prepared in ρ L ) in coherent auxiliary bath (CAB) and the nth thermal atom (prepared in ρ R ) in TTB, respectively, in M2 process. It is well known that when a finite system contacts with an infinite heat/nonequilibrium bath it will relax to (or be thermalized into) a steady state as the time increases, and a dynamical equilibrium can be established among the system and the baths, i.e., the steady heat current emerged This mechanism is suitable for our collision model. The interaction between the three-qubit system and the two baths in each round is used to mimic the thermal contact process in the conventional model, and the state of system, after each round, can be updated once including the populations and quantum correlation/coherence among qubits. For the sake of brevity, the THC mentioned in the following subsections refers to the steady THC
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