We report on the coherent phase manipulation of quantum dot excitons by electric means. For our experiments, we use a low capacitance single quantum dot photodiode which is electrically controlled by a custom designed SiGe:C BiCMOS chip. The phase manipulation is performed and quantified in a Ramsey experiment, where ultrafast transient detuning of the exciton energy is performed synchronous to double pulse π/2 ps laser excitation. We are able to demonstrate electrically controlled phase manipulations with magnitudes up to 3π within 100 ps which is below the dephasing time of the quantum dot exciton.

中文翻译：

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单激子量子位的超快电相位控制

我们报告了通过电手段对量子点激子进行相干相位操纵。在我们的实验中，我们使用低电容单量子点光电二极管，它由定制设计的 SiGe:C BiCMOS 芯片进行电气控制。在 Ramsey 实验中执行和量化相位操作，其中激子能量的超快瞬态失谐与双脉冲 π/2 ps 激光激发同步执行。我们能够在 100 ps 内演示幅度高达 3π 的电控制相位操作，这低于量子点激子的去相时间。