But this study is the first to experimentally show that optical precursors exist at the single-photon level, and that they are the fastest part of the single-photon wave packet.

而这次的研究则是第一次用实验证明，在单个光子层次上也存在着光前驱，而且它们也是单个光子的波包中最快的部分。

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This set-up is made of hyper-entangled photon source, linear optical elements and conventional photon detectors.

实验装置由超纠缠光子源，线性光学器件和常规的光子探测器组成。

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A method of generating the single-photon entangled states of a single photon state and a vacuum state through utilizing optical beam-splitter and single-photon source is described.

使用光学分束器和单光子源，利用单光子态和真空态制备出了纠缠单光子态。

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