Figure 1
llustration: Alan Stonebraker

Figure 1: The spin projection of a single hole in a quantum dot molecule has an anisotropic g factor that is highly sensitive to electric field. As a result, a modulated electric field from a local gate electrode in the presence of a static magnetic field could be used to rotate the spin—a technique called g-tensor modulation resonance. Moreover, light with a frequency that is resonant with the molecule’s optical transition could be used to initialize the spin and also to measure it after rotation. Thus one approach to quantum control of the spin would be (a) spin initialization through optical pumping, (b) coherent spin control through g-tensor modulation, (c) spin measurement through optical cycling techniques.