Highly Efficient Biphoton Generation from Thin Dense Atomic Ensemble

IF 3.7 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Heewoo Kim, Hansol Jeong, Han Seb Moon
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Abstract

Hybrid photonic quantum networks require photonic quantum states generated from different systems, such as atoms and quantum dots. Photonic quantum sources based on atomic ensembles are excellent candidates due to their brightness, low noise, and narrowband characteristics. Herein, a new platform for a highly efficient biphoton source is presented using a thin, dense atomic medium from a hot 1 mm-long chip-scale Cs atomic vapor cell. Strongly correlated bright biphotons are generated via spontaneous four-wave mixing from a dense atomic ensemble based on the 6S1/2–6P3/2–6D5/2 transition of 133Cs. Biphoton source achieves a detected biphoton count rate of 100 kilo-counts per second, a heralding efficiency of 15%, and a maximum normalized crosscorrelation function value of 100 between the signal and idler photons, despite the low detector efficiency of a silicon avalanche photodetector being less than 25% at 917 nm. Herein, the maximal violation of the Cauchy–Schwarz inequality by a factor greater than 106 at a pump power of 1 μW is obtained. The scheme for a highly efficient photon source is believed to be useful for scalable quantum networks.

Abstract Image

薄致密原子系综的高效双光子生成
混合光子量子网络需要由不同的系统(如原子和量子点)产生光子量子态。基于原子系综的光子量子源由于其亮度、低噪声和窄带特性而成为极好的候选光源。本文提出了一种新的高效双光子源平台,该平台使用来自热的1毫米长芯片级Cs原子蒸汽电池的薄而致密的原子介质。基于133Cs的6S1/2-6P3/2-6D5/2跃迁,通过密集原子系综自发的四波混合产生强相关的明亮双光子。尽管硅雪崩光电探测器在917 nm的探测效率不足25%,但双光子源的探测双光子计数率为每秒100千次,预示效率为15%,信号和空闲光子之间的最大归一化互相关函数值为100。在泵浦功率为1 μW时,Cauchy-Schwarz不等式的最大违逆系数大于106。高效光子源的方案被认为是可扩展量子网络的有用方案。
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