We demonstrate electrically controlled robust state preparation of an exciton qubit by rapid adiabatic passage with Fourier-limited laser pulses. In our approach, resonant ps laser pulses are applied to generate excitonic population in a quantum dot, whereas synchronously applied ps electric transients provide a controlled sweep of the exciton transition energy. The ps electric transients applied to the quantum dot in a diode structure result in ultrafast Stark shifts of the exciton energy on time scales below the decoherence time of the exciton. We experimentally demonstrate that the tailored electric chirp of the exciton energy leads to a controlled rapid adiabatic passage, which results in a robust state preparation of the exciton. Our experimental results are confirmed by a theoretical analysis of the chirped coherent manipulation of the exciton two level system. Our approach toward optoelectronic quantum control paves the way for broader applications that require a scalable control of functional coherent systems.

中文翻译：

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单个量子点中的电控快速绝热通道

我们通过傅里叶限制激光脉冲的快速绝热通道展示了激子量子位的电控鲁棒状态制备。在我们的方法中，共振 ps 激光脉冲用于在量子点中产生激子群，而同步应用的 ps 电瞬态提供激子跃迁能量的受控扫描。施加到二极管结构中的量子点的 ps 电瞬变导致激子能量在低于激子退相干时间的时间尺度上发生超快斯塔克位移。我们通过实验证明，激子能量的定制电啁啾导致受控的快速绝热通道，从而导致激子的稳健状态准备。我们的实验结果通过激子两能级系统啁啾相干操纵的理论分析得到证实。我们的光电量子控制方法为需要对功能相干系统进行可扩展控制的更广泛应用铺平了道路。