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We report on the realization of a coupled quantum dot (QD) system containingtwo single QDs made in two adjacent InAs nanowires. One QD (sensor QD) is usedas a charge sensor to detect the charge state transition in the other QD(target QD). We investigate the effect of the tunneling barrier asymmetry ofthe target QD on the detection visibility of charge state transition in thetarget QD. The charge stability diagrams of the target QD under differentconfigurations of barrier-gate voltages are simultaneously measured via thedirect signals of electron transport through the target QD and via thedetection signals of charge state transition in the target QD from the sensorQD. We find that the complete Coulomb diamond boundaries of the target QD andthe transport processes involving the excited states in the target QD can beobserved in the transconductance signals of the sensor QD only when thetunneling barriers of the target QD are nearly symmetric. These phenomena areexplained by analyzing the effect of the ratio of the two tunneling rates onthe electron transport processes through the target QD. Our results imply thatit is important to consider the symmetry of the tunneling couplings whenconstructing a charge sensor integrated QD device or qubit.

Charge detection of a quantum dot under different tunneling barrier symmetries and bias voltages