论文标题
延长单一充电Ingaas量子点合奏中相干光学响应的时间
Extending the time of coherent optical response in ensemble of singly-charged InGaAs quantum dots
论文作者
论文摘要
从量子发射器的大型集合中延长相干光学响应的时间尺度的能力对量子信息设备中的应用高度吸引力。在半导体纳米结构中，自由度的自由度可以用作辅助，强大的工具来修改相干的光学动力学。在这里，我们将这种方法应用于带负电的（IN，GA）为/GAAS自组装量子点，该点被认为是具有强大光学相干性和高带宽的出色量子发射器。我们研究3脉冲旋转依赖的光子回波，受到中度横向磁场的最高为1 t。我们证明，相干光学响应的时间尺度至少可以通过该场的数量级扩展。没有磁场，光子回声会以$ t_ 2 $ = 0.45 ns腐烂，这取决于Trions的辐射寿命$ T_1 $ = 0.27 ns。在存在横向磁场的情况下，光子回波信号的衰减是由居民电子合奏的自旋去式时间$ t_ {2，e} $ 〜4 ns给出的。我们证明，在Trion状态中重孔的非零横向G因子在长期寿命的光子回声信号的时间演化和磁场依赖性中起着至关重要的作用。
The ability to extend the time scale of the coherent optical response from large ensembles of quantum emitters is highly appealing for applications in quantum information devices. In semiconductor nanostructures, spin degrees of freedom can be used as auxiliary, powerful tools to modify the coherent optical dynamics. Here, we apply this approach to negatively charged (In,Ga)As/GaAs self-assembled quantum dots which are considered as excellent quantum emitters with robust optical coherence and high bandwidth. We study 3-pulse spin-dependent photon echoes subject to moderate transverse magnetic fields up to 1 T. We demonstrate that the timescale of coherent optical response can be extended by at least an order of magnitude by the field. Without magnetic field, the photon echo decays with $T_ 2$ = 0.45 ns which is determined by the radiative lifetime of trions $T_1$ = 0.27 ns. In the presence of the transverse magnetic field, the decay of the photon echo signal is given by spin dephasing time of the ensemble of resident electrons $T_{2,e}$ ~ 4 ns. We demonstrate that the non-zero transverse g-factor of the heavy holes in the trion state plays a crucial role in the temporal evolution and magnetic field dependence of the long-lived photon echo signal.
