Manipulation of a Single Charge in a Double Quantum Dot

Abstract

We manipulate a single electron in a fully tunable double quantum dot using microwave excitation. Under resonant conditions, microwaves drive transitions between the $(1,0)$ and $(0,1)$ charge states of the double dot. Local quantum point contact charge detectors enable a direct measurement of the photon-induced change in occupancy of the charge states. From charge sensing measurements, we find $T_1\sim 16\mathrm{n}\mathrm{s}$ and a lower bound estimate for $T_2^{*}$ of 400 ps for the charge two-level system.