利用谐振增强电光调制器对量子点单光子进行快速高效解复用
Fast and efficient demultiplexing of single photons from a quantum dot with resonantly enhanced electro-optic modulators
AI总结：
本文提出利用谐振增强电光调制器对GaAs量子点单光子进行主动时间到空间解复用，在38 MHz切换速率下实现79%端到端效率的四模式路由，并用于表征光子不可区分性。
摘要：
我们报道了一种基于主动解复用从共振激发GaAs量子点发射的单光子的多光子源。主动时间到空间模式解复用通过谐振增强的自由空间电光调制器实现，使得在38 MHz的高切换速率下路由单个光子成为可能。我们展示了以79%的高端到端效率路由到四个空间模式，并测得四光子符合计数率为0.17 Hz，该计数率主要受限于单光子源亮度，而非解复用器本身的效率。我们利用该解复用器表征了量子点连续发射的光子在不同延迟时间下的成对不可区分性。
英文摘要：
We report on a multi-photon source based on active demultiplexing of single photons emitted from a resonantly excited GaAs quantum dot. Active temporal-to-spatial mode demultipexing is implemented via resonantly enhanced free-space electro-optic modulators, making it possible to route individual photons at high switching rates of 38 MHz. We demonstrate routing into four spatial modes with a high end-to-end efficiency of 79% and measure a four-photon coincidence rate of 0.17 Hz mostly limited by the single-photon source brightness and not by the efficiency of the demultiplexer itself. We use the demultiplexer to characterize the pairwise indistinguishability of consecutively emitted photons from the quantum dot with variable delay time.
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