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Quantum measurement
According to the Heisenberg uncertainty principle, the precision of any physical quantity measurement is limited by quantum fluctuation in general, which leads to the so-called standard quantum limit (SQL). The SQL can be beaten by using squeezed light, hence enhancing the measurement accuracy. Squeezed light is a typical non-classical light, it exhibits reduced noise in one quadrature component. Since Caves proposed the scheme of phase measurement enhancement with squeezing, squeezed light has been used to enhance measurement precision in many areas.
Works

Higher-OrderSpatiallySqueezedBeamforEnhancedSpatial Measurements


Authors:Zhi Li, Hui Guo, Hongbo Liu, Jiaming Li, Hengxin Sun, Rongguo Yang, Kui Liu, Jiangrui Gao

提出了一种利用一种新的量子态——m阶空间压缩态实现超量子极限激光束高精度空间测量的方案,该量子态是亮HGm,0模相干态和压缩真空HGm+1,0模的组合。利用一个混合谐振光学参量放大器,实验证明了产生最大模阶为5的矩形高阶模压缩光的有效技术。此外,构造了四阶倾斜压缩光束和位移压缩光束,并用于空间倾斜和位移测量,从而将信噪比比HG0,0模提高了10和8.6dB。结果表明,高阶空间压缩态提高了超光噪极限的测量精度,并且在反作用噪声抑制方面更为突出。

Advanced Quantum Technologies,5, 2200055(2022)

Manipulation of continuous variable orbital angular momentum squeezing and entanglement by pump shaping


Authors:Zhi Li, Xulian Guo, Hengxin Sun, Kui Liu, and Jiangrui Gao

在本文中,我们首次直接利用光学参量振荡器(OPO)产生了LG0(+1)模式的- 5.4 dB和LG0(-1)模式的- 5.3 dB的OAM模式压缩态。此外,我们还证明了通过控制两种不同模式光束的相对相位来操纵OPO的非线性过程,分别产生了OAM模压缩态和纠缠态,从而产生了两种不同的空间多模泵浦光束。我们通过间接测量HG10(45◦)模式和HG10(135◦)模式的压缩,以及直接测量LG0(+1)和LG0(-1)模式之间的纠缠来表征Laguerre-Gaussian (LG)纠缠态。OAM量子态的有效操纵为高维量子信息和量子计量需求的连续可变量子态生成和构建提供了新的见解

Optics Express,31(3), 3651(2023)

Experimental Demonstration of a Displacement Measurement of an Optical Beam beyond the Quantum Noise Limit


Authors:Hengxin Sun, Zunlong Liu, Kui Liu, Rongguo Yang, Junxiang Zhang and Jiangrui Gao

 

Chinese Phys. Lett. 31, 084202, 2014

基于低频压缩光的声频信号测量


Authors:闫子华, 孙恒信, 蔡春晓, 马龙, 刘奎, 郜江瑞

物理学报66(11), 114205, 2017

Generation of optical frequency comb squeezed light field with TEM 01 transverse mode


Authors:Nan Huo,Chihua Zhou,Hengxin Sun,Kui Liu,and Jiangrui Gao

 

Chinese Opt. Lett. 14(6),62702,2016

Squeezing-enhanced rotating-angle measurement beyond the quantum limit


Authors:Kui Liu, Chunxiao Cai, Juan Li, Long Ma, Hengxin Sun, and Jiangrui Gao

利用量子光源,量子计量可以提高测量精度。这里我们介绍一种提高转角测量的方案。通过理论证明,借助一种量子态我们叫它轨道角动量位置压缩态和平衡零拍探测。我们实验上证明了超越标准量子极限3dB的转角测量。接下来我们讨论了,进一步提高测量精度需要更高阶的轨道角动量位置压缩光。该方法有望在未来的实际当中应用,比如高灵敏的赛格尼克干涉仪。

Applied Physics Letter 113, 261103, 2018

时域多模飞秒压缩光测量中的本地光脉冲整形研究


Authors:周驰华,张长春,刘洪波,刘奎,孙恒信,郜江瑞

量子光学学报 23(2), 208–214,2017

Generation of temporal multimode squeezed states of femtosecond pulse light


Authors:Chihua Zhou, Changchun Zhang, Hongbo Liu, Kui Liu, Hengxin Sun, and Jiangrui Gao

Chinese Optics Letters 15(9), 92703, 2017

Small-displacement measurements using high-order Hermite-Gauss modes


Authors:Hengxin Sun, Kui Liu, Zunlong Liu, Pengliang Guo, Junxiang Zhang and Jiangrui Gao

我们提出了一种利用高阶厄米高斯光束和平衡零拍探测的小位移测量。通过基模与一阶模式作为信号场进行比较证明了该方法的有效性,结果证明通过使用一阶模式相比于基模测量精度提高了1.41倍。该方案在精密计量学,原子力显微镜和光学成像当中具有潜在应用价值。

Appl. Phys. Lett. 104, 121908, 2014