Petta J R, Johnson A C, Marcus C M, Hanson M P, Gossard A C
Department of Physics, Harvard University, Cambridge, MA 02138, USA.
Phys Rev Lett. 2004 Oct 29;93(18):186802. doi: 10.1103/PhysRevLett.93.186802. Epub 2004 Oct 27.
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 T1 approximately 16 ns and a lower bound estimate for T*(2) of 400 ps for the charge two-level system.
我们使用微波激发在一个完全可调谐的双量子点中操控单个电子。在共振条件下，微波驱动双量子点的(1,0)和(0,1)电荷态之间的跃迁。局部量子点接触电荷探测器能够直接测量光子诱导的电荷态占据变化。通过电荷传感测量，我们发现电荷双能级系统的T1约为16纳秒，T*(2)的下限估计为400皮秒。
