Fig. 1. Schematic of a quantum repeater

Fig. 2. Schematic of energy-level and quantum confinement effect of quantum dot

Fig. 3. Tuning scheme for combined strain and static electric field^{［50，51］}

Fig. 4. Tuning scheme for combined magnetic and static electric fields^［52］

Fig. 5. Tuning scheme for anisotropic strain^［53-55］

Fig. 6. Tuning scheme for combined light and static electric fields^［56］

Fig. 7. Quantum dot coupled to a circular Bragg grating^［69］

Fig. 8. Quantum dot coupled to a double-cavity structure^［70］