Quantum-optical spectroscopy of a two-level system using an electrically driven micropillar laser as a resonant excitation source
Quantum-optical spectroscopy of a two-level system using an electrically driven micropillar laser as a resonant excitation source
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DOI：
10.1038/s41377-018-0045-6
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发表时间：
2018-07-25
影响因子：
19.4
通讯作者：
Reitzenstein, Stephan
中科院分区：
文献类型：
--
作者：
Kreinberg, Soeren;Grbesic, Tomislav;Reitzenstein, Stephan
二能级发射体是光子量子技术的主要组成部分，也是固态量子光学研究的模型系统。最令人感兴趣的是这种发射体的严格共振激发，以相干地控制它们的占用并产生接近理想的量子光，这对于光子量子技术的应用至关重要。迄今为止，在这一领域的方法和实验已经完全使用笨重的激光器进行，这阻碍了共振驱动的二能级发射器在紧凑的光子量子系统中的应用。在这里，我们解决这个问题，并提出了一个紧凑的共振驱动的单光子源的概念，通过使用紧凑的高β微激光器作为激发源进行量子光学光谱的两级系统。二能级系统是基于半导体量子点（QD），这是由光纤耦合的电驱动的微柱激光器共振激发。我们在连续波激发下修饰量子点的激子态，并通过156 MHz的脉冲共振激发触发具有强多光子抑制（go（2））（0）= 0.02）和高光子不稳定性（V = 57 +/- 9%）的单光子发射。这些结果清楚地表明了我们的共振激发方案的高潜力，它可以为具有优异量子特性的紧凑型电驱动量子光源铺平道路，从而实现先进的量子通信协议。
Two-level emitters are the main building blocks of photonic quantum technologies and are model systems for the exploration of quantum optics in the solid state. Most interesting is the strict resonant excitation of such emitters to control their occupation coherently and to generate close to ideal quantum light, which is of utmost importance for applications in photonic quantum technology. To date, the approaches and experiments in this field have been performed exclusively using bulky lasers, which hinders the application of resonantly driven two-level emitters in compact photonic quantum systems. Here we address this issue and present a concept for a compact resonantly driven single-photon source by performing quantum-optical spectroscopy of a two-level system using a compact high-beta microlaser as the excitation source. The two-level system is based on a semiconductor quantum dot (QD), which is excited resonantly by a fiber-coupled electrically driven micropillar laser. We dress the excitonic state of the QD under continuous wave excitation, and trigger the emission of single photons with strong multi-photon suppression (go((2))(0) = 0.02) and high photon indistinguishability (V = 57 +/- 9%) via pulsed resonant excitation at 156 MHz. These results clearly demonstrate the high potential of our resonant excitation scheme, which can pave the way for compact electrically driven quantum light sources with excellent quantum properties to enable the implementation of advanced quantum communication protocols.