Quantum enhanced Doppler LiDAR based on integrated quantum squeezed light source(Invited)

Li Gao; Xiaoli Zhang; Jingting Ma; Wenxiu Yao; Qingwei Wang; Yue Sun; Zunlong Liu; Yajun Wang; Long Tian; Yaohui Zheng

doi:10.3788/IRLA20210031

Journals >Infrared and Laser Engineering >Volume 50 >Issue 3 >Page 20210031 > Article

Infrared and Laser Engineering
Vol. 50, Issue 3, 20210031 (2021)

Quantum enhanced Doppler LiDAR based on integrated quantum squeezed light source(Invited)

Li Gao¹, Xiaoli Zhang¹, Jingting Ma², Wenxiu Yao¹..., Qingwei Wang¹, Yue Sun², Zunlong Liu², Yajun Wang^1,3, Long Tian^1,3 and Yaohui Zheng^1,3|Show fewer author(s)

Author Affiliations

¹State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China

²Beijing Huahang Radio Measurement Institute, Beijing 102401, China

³Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China

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DOI: 10.3788/IRLA20210031 Cite this Article

Li Gao, Xiaoli Zhang, Jingting Ma, Wenxiu Yao, Qingwei Wang, Yue Sun, Zunlong Liu, Yajun Wang, Long Tian, Yaohui Zheng. Quantum enhanced Doppler LiDAR based on integrated quantum squeezed light source(Invited)[J]. Infrared and Laser Engineering, 2021, 50(3): 20210031 Copy Citation Text

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Abstract

Though the measurement precision of the traditional LiDAR is gradually increased, it is still limited by the quantum noise of the optical field and the extra noise introduced by the detection process. To improve the detection performance of LiDAR, a new scheme using quantum squeezed state light field as local oscillator of LiDAR was proposed and the key factors for improving the detection precision of LiDAR was analyzed. Then an integrated low-noise squeezed light field was prepared, and the experiment of LiDAR Doppler information measurement was carried out. The results show that the Doppler information detection sensitivity by using quantum squeezed state is 3 dB higher than the traditional scheme of the coherent state light field as the local oscillator, which paves a research path for the detection of weak signals such as Doppler information.

Keywords

LiDAR quantum enhancement quantum radar squeezed state

$\left\langle {{\delta ^2}X} \right\rangle =\left\langle {{\delta ^2}Y} \right\rangle =1$

(1)

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${\hat d_1} = \frac{1}{{\sqrt 2 }}(\hat a - \hat b{{\rm{e}}^{i\theta }})$

(2)

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${\hat d_2} = \frac{1}{{\sqrt 2 }}(\hat a + \hat b{{\rm{e}}^{i\theta }})$

(3)

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${i_{{d_1}}} = \hat d_1^\dagger {\hat d_1} = \frac{1}{2}({\hat a^\dagger }\hat a - {\hat a^\dagger }\hat b{{\rm{e}}^{i\theta }} - {\hat b^\dagger }\hat a{{\rm{e}}^{ - i\theta }} + {\hat b^\dagger }\hat b)$

(4)

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${i_{{d_2}}} = \hat d_2^\dagger {\hat d_2} = \frac{1}{2}({\hat a^\dagger }\hat a + {\hat a^\dagger }\hat b{e^{i\theta }} + {\hat b^\dagger }\hat a{e^{ - i\theta }} + {\hat b^\dagger }\hat b)$

(5)