论文标题

使用背景发射的抑制作用的“沙漏”单光子源的近乎义务效率和光子不可区分性

Near-unity efficiency and photon indistinguishability for the "hourglass" single-photon source using suppression of background emission

论文作者

Gaál, Benedek, Jacobsen, Martin Arentoft, Vannucci, Luca, Claudon, Julien, Gérard, Jean-Michel, Gregersen, Niels

论文摘要

可扩展的光学量子信息处理中的一个持续挑战是提高收集效率$ \ varepsilon $和单光子源的光子不可区分性$η$。在基于量子点的来源中,最近质疑将产品$ \ varepsilonη$提高到任意接近Unity的前景。在这项工作中,我们讨论了在有声子引起的退积的情况下效率与无法区分性之间的权衡的影响,并且我们表明,光子“ Hourglass”设计允许改善$ \ varepsilonη$,而不是预测的最大值的标准微柱设计的最大值。由于控制了背景辐射模式的自发排放,因此可以进行这种折衷的规定,我们的工作突出了背景排放在将来的量子点单光子源的近乎统一性能中的重要性。

An on-going challenge within scalable optical quantum information processing is to increase the collection efficiency $\varepsilon$ and the photon indistinguishability $η$ of the single-photon source towards unity. Within quantum dot-based sources, the prospect of increasing the product $\varepsilon η$ arbitrarily close to unity was recently questioned. In this work, we discuss the influence of the trade-off between efficiency and indistinguishability in the presence of phonon-induced decoherence, and we show that the photonic "hourglass" design allows for improving $\varepsilon η$ beyond the predicted maximum for the standard micropillar design subject to this trade-off. This circumvention of the trade-off is possible thanks to control of the spontaneous emission into background radiation modes, and our work highlights the importance of engineering of the background emission in future pursuits of near-unity performance of quantum dot single-photon sources.

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