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Abstract
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This study presents a comparative analysis of three quantum thermal engines utilizing a two-qubit Heisenberg
XXZ chain as the working substance. A novel generalized quantum Otto cycle (GQOC) is introduced, featuring
two distinct coupling configurations to thermal reservoirs. The GQOC exhibits the potential for 100% efficiency,
surpassing the efficiency of the conventional quantum Otto cycle. Essential conditions for positive work extraction and achieving maximum unity efficiency are derived. An experimental implementation using quantum
electrodynamic circuits and Transmon qudit is proposed. This work contributes to the advancement of quantum
heat engines, highlighting the benefits of nonequilibrium processes and asymmetric coupling for enhanced work
extraction and efficiency
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