期刊
PHYSICAL REVIEW A
卷 106, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.106.022420
关键词
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资金
- Key -Area Research and Development Program of Guangdong Province [2018B030326001]
- National Natural Science Foundation of China [11874312]
- Research Grants Council of Hong Kong [11303617]
- Guangdong In- novative and Entrepreneurial Research Team Program [2016ZT06D348]
Studying the superexchange interaction in quantum dot systems, it has been found that increasing the number of mediating electrons and forming a four-electron triplet can enhance the superexchange.
Long-range interaction between distant spins is an important building block for the realization of a large quantum-dot network in which couplings between pairs of spins can be selectively addressed. Recent experiments on the coherent oscillation of logical states between remote spins facilitated by intermediate electron states were the first step for large-scale quantum information processing. Reaching this ultimate goal requires extensive studies on the superexchange interaction in different quantum-dot spatial arrangements and electron configurations. Here, we consider a linear triple quantum dot with two antiparallel spins in the outer dots forming the logical states while varying numbers of electrons in the middle dot form a mediator, which facilitates the superexchange interaction. We show that the superexchange is enhanced when the number of mediating electrons increases. In addition, we show that forming a four-electron triplet in the mediator dot further enhances the superexchange strength. Our work can be a guide to scale up the quantum-dot array with controllable and dense connectivity.
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