Conditions for entangled photon emission from (111)B site-controlled pyramidal quantum dots
Conditions for entangled photon emission from (111)B site-controlled pyramidal quantum dots
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DOI：
10.1063/1.4916705
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发表时间：
2015-04-07
影响因子：
3.2
通讯作者：
Pelucchi, E.
中科院分区：
文献类型：
--
作者：
Juska, G.;Murray, E.;Pelucchi, E.
研究了高度对称的位控金字塔结构In 0.25Ga 0.75As量子点。讨论了偏振纠缠光子也可以从与Juska等人（Nat. Phot. 7，527，2013）。此外，解决了纠缠光子发射器的更高密度的一些限制。这些问题包括（1）剩余的小精细结构分裂和（2）在非共振激发条件下的有效QD充电，这大大减少了有用的双激子-激子复合事件的数量。一个可能的解决方案的充电问题的研究，利用双波长激发技术，它允许一个逐步的量子点电荷调谐从强负到正，并最终有效地检测纠缠光子从量子点，这将是无效的，否则在单波长（非共振）激发。(C)2015 AIP Publishing LLC.
A study of highly symmetric site-controlled Pyramidal In0.25Ga0.75As quantum dots (QDs) is presented. It is discussed that polarization-entangled photons can be also obtained from Pyramidal QDs of different designs from the one already reported in Juska et al. (Nat. Phot. 7, 527, 2013). Moreover, some of the limitations for a higher density of entangled photon emitters are addressed. Among these issues are (1) a remaining small fine-structure splitting and (2) an effective QD charging under non-resonant excitation conditions, which strongly reduce the number of useful biexciton-exciton recombination events. A possible solution of the charging problem is investigated exploiting a dual-wavelength excitation technique, which allows a gradual QD charge tuning from strongly negative to positive and, eventually, efficient detection of entangled photons from QDs, which would be otherwise ineffective under a single-wavelength (non-resonant) excitation. (C) 2015 AIP Publishing LLC.