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Energizing a quantum system using quantum engine-inspired architectures: an optimization study
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DOI：10.1088/1367-2630/ae6096.png)
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Abstract
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We investigate how quantum engine inspired architectures can be exploited to energize an external quantum system and thereby prepare it as a useful resource for subsequent quantum tasks. We consider a qutrit working substance and a target qubit to be energized, and analyze both sequential and simultaneous schemes. In the sequential scheme the process occurs in three successive strokes, involving interaction with the first bath, the qubit, and the second bath in order, whereas in the simultaneous scheme all interactions take place in a single step. Each architecture is further classified as non-selective, allowing transitions among all qutrit levels, or selective, where only specific transitions are permitted, leading to four distinct operational schemes. We optimize the transferred energy over the relevant control parameters and compare the four schemes in terms of the total energy delivered to the qubit, the fraction of transferred energy, and the energy transmitted ratio (ETR), defined as the ratio of the energy transferred to the qubit to the total heat absorbed from the baths. We find that the sequential non-selective architecture achieves the highest energy transfer and ETR in the optimal regime, while also delivering a finite amount of power. We also show that the energized qubit in such a scheme can serve as potential quantum batteries. At the same time, we show that for certain architectures the optimization drives the system into parameter regimes where the two bath temperatures become equal, so that the dynamics no longer corresponds to genuine heat-engine operation, despite the underlying engine-inspired structure.
Keywords:
quantum thermal devices
quantum heat engine
quantum battery
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