Bock Matthias, Lenhard Andreas, Chunnilall Christopher, Becher Christoph
Opt Express. 2016 Oct 17;24(21):23992-24001. doi: 10.1364/OE.24.023992.
We present the realization of a highly efficient photon pair source based on spontaneous parametric downconversion (SPDC) in a periodically poled lithium niobate (PPLN) ridge waveguide. The source is suitable for long distance quantum communication applications as the photon pairs are located at the centers of the telecommunication O- and C- band at 1312 nm and 1557 nm. The high efficiency is confirmed by a conversion efficiency of 4 × 10 - which is to our knowledge among the highest conversion efficiencies reported so far - and a heralding efficiency of 64.1 ± 2.1%. The heralded single-photon properties are confirmed by the measurement of the photon statistics with a Click/No-Click method as well as the heralded g-function. A minimum value for g(0) of 0.001 ± 0.0003 indicating clear antibunching has been observed.
我们展示了一种基于周期性极化铌酸锂（PPLN）脊形波导中的自发参量下转换（SPDC）实现的高效光子对源。该源适用于长距离量子通信应用，因为光子对位于电信O波段和C波段的中心，波长分别为1312nm和1557nm。通过4×10的转换效率（据我们所知，这是迄今为止报道的最高转换效率之一）和64.1±2.1%的预示效率证实了其高效率。通过使用点击/不点击方法测量光子统计以及预示g函数，证实了预示单光子特性。已观察到g(0)的最小值为0.001±0.0003，表明明显的反聚束现象。
