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arXiv 1802.04771quant-phcond-mat.quant-gas
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共振荧光的亚自然线宽和单光子联合发射

Joint subnatural-linewidth and single-photon emission from resonance fluorescence

Juan Camilo López Carreño, Eduardo Zubizarreta Casalengua, Fabrice P. Laussy, Elena del Valle

摘要:

共振荧光-当共振激发二能级系统时发出的光-是一种流行的量子源,因为它似乎继承了驱动激光的光谱特性和二能级系统的统计特性,从而提供了一种亚自然线宽的单光子源。然而,这两种性质实际上在共振荧光中并不共存,因为检测到这些反聚束光子的光学目标本身将是光谱宽的并且不会受益于光谱窄的源,或者与源在光谱上匹配,但在这种情况下反聚束将被破坏。我们首先通过场发射的分解来解释这种失败,以及它如何受到频率分辨率的影响。然后,我们将展示如何恢复所寻求的联合亚自然线宽和反聚束特性,通过干涉共振荧光输出与相干光束。最后,我们讨论如何最终产生的信号,以这种方式具有一种新型的量子相关性,与高原的反聚束,抑制更强烈的密切的光子对。这就引入了理想单光子源的新概念。

英文摘要:

Resonance fluorescence---the light emitted when exciting resonantly a two-level system---is a popular quantum source as it seems to inherit its spectral properties from the driving laser and its statistical properties from the two-level system, thus providing a subnatural-linewidth single-photon source. However, these two qualities do not actually coexist in resonance fluorescence, since an optical target detecting these antibunched photons will either be spectrally broad itself and not benefit from the spectrally narrow source, or match spectrally with the source but in this case the antibunching will be spoiled. We first explain this failure through a decomposition of the field-emission and how this gets affected by frequency resolution. We then show how to restore the sought joint subnatural linewidth and antibunched properties, by interfering the resonance fluorescence output with a coherent beam. We finally discuss how the signal that is eventually generated in this way features a new type of quantum correlations, with a plateau of antibunching which suppresses much more strongly close photon pairs. This introduces a new concept of perfect single-photon source.

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