Quantum Dots for Single- and Entangled-Photon Emitters
Quantum Dots for Single- and Entangled-Photon Emitters
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用于单光子和纠缠光子发射器的量子点
DOI：
10.1117/12.846782
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发表时间：
2009
影响因子：
2.4
通讯作者：
A. K. Kalagin
中科院分区：
文献类型：
--
作者：
D. Bimberg;E. Stock;A. Lochmann;A. Schliwa;J. A. Töfflinger;W. Unrau;Michael Münnix;S. Rodt;V. Haisler;A. Toropov;Askhat K. Bakarov;A. K. Kalagin
有效地产生偏振单光子或纠缠光子是实现量子密钥分发（QKD）系统的关键要求。自组织半导体量子点（QDs）能够在适当的电流注入下一次发射一个极化光子或纠缠光子对。我们基于成熟的半导体技术实现了高效的单光子源（SPS）：在引脚结构中，使用亚微米AlOx电流孔径将单个电子和单个空穴汇集到单个InAs QD中。有效的辐射复合导致单偏振光子的发射具有空前的光谱纯度记录。不使用额外的光谱滤波发射光的非经典性被证明。将SPS嵌入微腔中，提高了其外耦合效率和发射速率。微腔的设计是在详细建模的基础上进行的，以优化其性能。所得谐振单量子点二极管以1ghz的重复频率驱动，其二阶相关函数为g(2)(0) = 0。最后，提出了在（111）取向衬底上生长的量子点作为纠缠光子对的来源。导致激子亮态分裂的本征对称性降低效应在这种衬底取向下不存在。因此，量子点的XX rarr X rarr 0重组级联可以用于产生纠缠光子，而无需通过量子点的大小和/或形状进一步调整精细结构分裂。
The efficient generation of polarized single or entangled photons is a crucial requirement for the implementation of quantum key distribution (QKD) systems. Self-organized semiconductor quantum dots (QDs) are capable of emitting one polarized photon or an entangled photon pair at a time using appropriate electrical current injection. We realized a highly efficient single-photon source (SPS) based on well-established semiconductor technology: In a pin structure, a single electron and a single hole are funneled into a single InAs QD using a submicron AlOx current aperture. Efficient radiative recombination leads to emission of single polarized photons with an all-time record purity of the spectrum. Non-classicality of the emitted light without using additional spectral filtering is demonstrated. The out-coupling efficiency and the emission rate are increased by embedding the SPS into a micro-cavity. The design of the micro-cavity is based on detailed modeling to optimize its performance. The resulting resonant single-QD diode is driven at a repetition rate of 1 GHz, exhibiting a second-order correlation function of g(2)(0) = 0. Eventually, QDs grown on (111)-oriented substrates are proposed as a source of entangled photon pairs. Intrinsic symmetry-lowering effects leading to the splitting of the exciton bright states are shown to be absent for this substrate orientation. As a result, the XX rarr X rarr 0 recombination cascade of a QD can be used for the generation of entangled photons without further tuning of the fine-structure splitting via QD size and/or shape.
影响因子：
3.7
作者：
Schliwa, Andrei;Winkelnkemper, Momme;Bimberg, Dieter
通讯作者：
Bimberg, Dieter