降低单光子级频率转换中的噪声。

Reducing noise in single-photon-level frequency conversion.

机构信息

Information Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.

出版信息

Opt Lett. 2013 Apr 15;38(8):1310-2. doi: 10.1364/OL.38.001310.

DOI:10.1364/OL.38.001310

Abstract

We demonstrate low-noise and efficient frequency conversion by sum-frequency mixing in a periodically poled LiNbO(3) (PPLN) waveguide. Using a 1556 nm pump, 1302 nm photons are efficiently converted to 709 nm photons. We obtain 70% conversion efficiency in the PPLN waveguide and >50% external conversion efficiency with 600 noise counts per second at peak conversion with continuous-wave pumping. We simultaneously achieve low noise and high conversion efficiency by careful spectral filtering. We discuss the impact of low-noise frequency translation on single-photon upconversion detection and quantum information applications.

摘要

我们通过在周期性极化铌酸锂（PPLN）波导中的和频混合演示了低噪声和高效的频率转换。利用 1556nm 的泵浦光，1302nm 的光子被有效地转换成 709nm 的光子。我们在 PPLN 波导中获得了 70%的转换效率，并且在连续波泵浦下，在峰值转换时，通过 600 个噪声计数，获得了超过 50%的外部转换效率。我们通过仔细的光谱滤波同时实现了低噪声和高转换效率。我们讨论了低噪声频率转换对单光子上转换检测和量子信息应用的影响。