Sub\|shot\|noise measurement for slight absorption is experimentally achieved with the twin beams of quantum correlation. The improvement in signal\|to\|noise ratio of 2.5 dB relative to the SNL is obtained. The exper...Sub\|shot\|noise measurement for slight absorption is experimentally achieved with the twin beams of quantum correlation. The improvement in signal\|to\|noise ratio of 2.5 dB relative to the SNL is obtained. The experimental results demonstrate the predictions of the semi\|classical theory.展开更多
在^(6)Li冷原子系综中,本团队发展了弱探测光和强本地光差拍探测的技术,在极低探测光功率密度的条件下(<10^(-3)饱和光强),实现了达到光子散粒噪声极限的光谱测量.基于高精度光学频率梳的频率稳定性传递链,将探测光锁到光梳上,精确...在^(6)Li冷原子系综中,本团队发展了弱探测光和强本地光差拍探测的技术,在极低探测光功率密度的条件下(<10^(-3)饱和光强),实现了达到光子散粒噪声极限的光谱测量.基于高精度光学频率梳的频率稳定性传递链,将探测光锁到光梳上,精确测量了^(6)Li原子的D线跃迁频率,得到不确定度优于1 k Hz的^(6)Li D1线跃迁的绝对频率,比当前最高精度的测量提高了一个量级.2P能级精细结构劈裂和2P1/2能级超精细结构劈裂分别为10052.7804(18)和26.1031(14)MHz,与最近的相对论修正及量子电动力学修正的理论计算相符合.本团队的测量结果给更高精度的理论计算提供了实验基准,同时也有助于解决之前不同实验测量的差异.展开更多
文摘Sub\|shot\|noise measurement for slight absorption is experimentally achieved with the twin beams of quantum correlation. The improvement in signal\|to\|noise ratio of 2.5 dB relative to the SNL is obtained. The experimental results demonstrate the predictions of the semi\|classical theory.
文摘在^(6)Li冷原子系综中,本团队发展了弱探测光和强本地光差拍探测的技术,在极低探测光功率密度的条件下(<10^(-3)饱和光强),实现了达到光子散粒噪声极限的光谱测量.基于高精度光学频率梳的频率稳定性传递链,将探测光锁到光梳上,精确测量了^(6)Li原子的D线跃迁频率,得到不确定度优于1 k Hz的^(6)Li D1线跃迁的绝对频率,比当前最高精度的测量提高了一个量级.2P能级精细结构劈裂和2P1/2能级超精细结构劈裂分别为10052.7804(18)和26.1031(14)MHz,与最近的相对论修正及量子电动力学修正的理论计算相符合.本团队的测量结果给更高精度的理论计算提供了实验基准,同时也有助于解决之前不同实验测量的差异.
