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arXiv 0810.2406cond-mat.mes-hall
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基于互相关技术的时间分辨电荷检测

Time-resolved charge detection with cross-correlation techniques

B. Küng, O. Pfäffli, S. Gustavsson, T. Ihn, K. Ensslin, M. Reinwald, W. Wegscheider

摘要:

我们提出了时间分辨的电荷传感测量的GaAs双量子点与两个邻近的量子点接触(QPC)检测器。QPC电流进行了分析与互相关技术,这使我们能够测量点充电和放电率显着更小的信噪比比所需的充电检测与一个单一的QPC。这允许降低检测器中的电流水平,从而降低检测过程的侵入性,并且可以帮助增加噪声限制设置中的可用测量带宽。

英文摘要:

We present time-resolved charge sensing measurements on a GaAs double quantum dot with two proximal quantum point contact (QPC) detectors. The QPC currents are analyzed with cross-correlation techniques, which enables us to measure dot charging and discharging rates for significantly smaller signal-to-noise ratios than required for charge detection with a single QPC. This allows to reduce the current level in the detector and therefore the invasiveness of the detection process and may help to increase the available measurement bandwidth in noise-limited setups.

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