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首页> 外文期刊>Bulletin of the American Physical Society >APS -2017 Annual Meeting of the APS Mid-Atlantic Section- Event - Charging Dynamics of Single InGaAs Quantum Dots under Resonant Excitation
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APS -2017 Annual Meeting of the APS Mid-Atlantic Section- Event - Charging Dynamics of Single InGaAs Quantum Dots under Resonant Excitation

机译：APS -2017 APS中大西洋部分年会-事件-共振激发下单个InGaAs量子点的充电动力学

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摘要

Quantum dots (QDs) have potential to generate single indistinguishable photons, thus are prime candidates to be sources of photonic quantum bits, or qubits, necessary for quantum computation protocols. In theory, photon emission requires only resonant excitation. But resonant excitation can cause a QD to transition to a different charge state, eliminating the resonance fluorescence and reduces the QD's suitability to act as an efficient photon source. A counter to this effect is implementation of a low-power above-band laser that supplies the local environment with charge carriers. Ultimately, the carriers can relax into the quantum dot, returning it to the initial charge state. If QDs are to be used to generate photonic qubits, the charge relaxation processes must be characterized. To probe the charging dynamics, we modulate the above-band excitation while measuring the time-resolved resonance fluorescence. We phenomenologically fit the time-resolved fluorescence and extract the corresponding charging and neutralization rates as functions of both laser powers. The power dependence of the rates suggest there exists an external reservoir that supplies charge carriers to the QD, and that neutralization is dominated mostly by Auger processes.
机译：量子点（QD）有可能产生单个不可区分的光子，因此是成为量子计算协议必需的光子量子位或量子位源的主要候选者。从理论上讲，光子发射仅需要共振激发。但是共振激发会导致QD转变为不同的电荷状态，从而消除共振荧光并降低QD用作有效光子源的适用性。与这种效果相反的是，实施了一种低功率的带上激光器，该激光器为本地环境提供了载流子。最终，载流子可以放松到量子点中，使其返回初始电荷状态。如果要使用量子点来生成光子量子位，则必须表征电荷弛豫过程。为了探究充电动力学，我们在测量时间分辨共振荧光的同时调制了上述频带的激励。我们在现象学上拟合时间分辨的荧光，并提取相应的带电率和中和率，作为两种激光功率的函数。速率的功率相关性表明存在一个外部存储库，可为QD提供电荷载流子，而中和作用主要由俄歇过程控制。

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