Real-time detection of single-electron tunneling using a quantum point contact
Real-time detection of single-electron tunneling using a quantum point contact
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DOI：
10.1063/1.1815041
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发表时间：
2004-07
影响因子：
4
通讯作者：
L. Vandersypen;J. Elzerman;R. Schouten;L. V. Beveren;R. Hanson;L. Kouwenhoven
中科院分区：
文献类型：
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作者：
L. Vandersypen;J. Elzerman;R. Schouten;L. V. Beveren;R. Hanson;L. Kouwenhoven
我们观察单个电子之间的量子点和水库的个别隧道事件，使用附近的量子点接触（QPC）作为一个电荷计。QPC与量子点电容耦合，量子点上的电子数变化1时，QPC电导变化约1%。QPC是电压偏置的，在室温下用电流-电压（I-V）示波器监测电流。我们可以解决隧道事件仅相隔8？？s，受到I-V整流器噪声的限制。QPC中的散粒噪声设置为25？ns的下限上可访问的时间尺度。
We observe individual tunnel events of a single electron between a quantum dot and a reservoir, using a nearby quantum point contact (QPC) as a charge meter. The QPC is capacitively coupled to the dot, and the QPC conductance changes by about 1% if the number of electrons on the dot changes by one. The QPC is voltage biased and the current is monitored with a current–voltage (I–V) convertor at room temperature. We can resolve tunnel events separated by only 8??s, limited by noise from the I–V convertor. Shot noise in the QPC sets a 25?ns lower bound on the accessible timescales.