Generating quantum light emitters that operate at room temperature and at telecom wavelengths remains a significant materials challenge. To achieve this goal requires light sources that emit in the near-infrared wavelength region and that, ideally, are tunable to allow desired output wavelengths to be accessed in a controllable manner. Here, we show that exciton localization at covalently introduced aryl sp³ defect sites in single-walled carbon nanotubes provides a route to room-temperature single-photon emission with ultrahigh single-photon purity (99%) and enhanced emission stability approaching the shot-noise limit. Moreover, we demonstrate that the inherent optical tunability of single-walled carbon nanotubes, present in their structural diversity, allows us to generate room-temperature single-photon emission spanning the entire telecom band. Single-photon emission deep into the centre of the telecom C band (1.55 µm) is achieved at the largest nanotube diameters we explore (0.936 nm).

中文翻译：

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碳纳米管中sp3缺陷在电信波长下可调节的室温单光子发射

产生在室温和电信波长下工作的量子发光器仍然是重大的材料挑战。为了实现该目标，需要在近红外波长范围内发射并且理想情况下可调谐以允许以可控方式访问所需输出波长的光源。在这里，我们显示了在共价引入的芳基sp ³处的激子定位单壁碳纳米管中的缺陷位点提供了通向室温单光子发射的途径，该方法具有超高的单光子纯度（99％）和接近散粒噪声极限的增强的发射稳定性。此外，我们证明了单壁碳纳米管固有的光学可调谐性，以其结构多样性而存在，使我们能够产生跨越整个电信频段的室温单光子发射。在我们探索的最大纳米管直径（0.936 nm）下，实现了进入电信C波段中心（1.55 µm）深处的单光子发射。