Comparative study of squeezed vacuum states prepared by using 1064-nm solid-state and fiber-laser as pump source

Yang Wen-Hai; Diao Wen-Ting; Cai Chun-Xiao; Song Xue-Rui; Feng Fu-Pan; Zheng Yao-Hui; Duan Chong-Di

doi:10.7498/aps.68.20182304

Abstract

Squeezed states, which have fewer fluctuations in one quadrature than vacuum noise at the expense of increasing fluctuations in the other quadrature, can be used to enhance measurement accuracy, increase detection sensitivity, and improve fault tolerance performance for quantum information and quantum computation. In this paper, the influences of relative intensity noise (RIN) of all-solid-state single-frequency laser and single-frequency fiber laser on the squeezing factor of squeezed vacuum states are experimentally and theoretically studied. Here, an all-solid-state single-frequency laser and a single-frequency fiber laser each are used as a light source of the system generating squeezed vacuum states. The homodyne detection is used to compare the RIN of all-solid-state single-frequency laser and that of single-frequency fiber laser at the analysis frequency of 1 MHz. The results show that the RIN of the all-solid-state single-frequency laser and single-frequency fiber laser are higher than those of the shot noise limitation 2.3 dB and 30 dB at the analysis frequency of 1 MHz, respectively. The RIN of all-solid-state single-frequency laser is far less than that of the single-frequency fiber laser. As a result, squeezed vacuum state with maximum quantum noise reduction of (13.2 ± 0.2) dB and (10 ± 0.2) dB are directly detected. Theoretical calculation shows that the influence of the RIN on the measurement accuracy is the major factor of degrading the squeezing factor with the fiber laser as the pump source. The measurement error of squeezed vacuum state caused by the RIN of single-frequency fiber laser is about 2.6 dB. The discrepancy of the pump power between the two lasers is another factor of affecting the squeezing factor, corresponding to 0.6 dB quantum noise difference. The theoretical calculations are consistent with the experimental results, which provides some guidance for developing the practical squeezed states with highly squeezing level.

Keywords:

Authors and contacts

1.
China Academy of Space Technology (Xi’an), Xi’an 710100, China
2.
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
3.
Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China

Corresponding author: Zheng Yao-Hui, yhzheng@sxu.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 11654002, 61575114, 61501368, 11505135), the Program for Sanjin Scholar of Shanxi Province, China, the Fund for Shanxi “1331 Project” Key Subjects Construction, China, and the Program for Outstanding Innovative Teams of Higher Learning Institutions of Shanxi, China.

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References

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Cited By

图 1 本底光RIN测量装置和压缩态光场产生实验系统(SHG, 倍频; EOM, 电光调制器; PZT, 锆钛酸铅压电陶瓷; BHD, 平衡零拍探测器; DBS, 分束镜; OPA, 光参量放大器; LO beam, 本底光; SA, 频谱仪)

Figure 1. Schematic of the experimental setup for measuring the local oscillator intensity noise and generating the squeezed state (SHG, second-harmonic generation; EOM, electro-optic modulator; PZT, piezoelectric ceramic transducer; BHD, balanced homodyne detector; DBS, dichroic beam splitter; OPA, optical parametric amplifier; LO, local oscillator; SA, spectrum analyzer).

DownLoad: Full-Size Img PowerPoint

图 2 单频光纤激光器经MC滤除一部分RIN和相位噪声后对应的本底光RIN

Figure 2. RIN of local oscillator with single-frequency Yb³⁺-doped phosphate fiber laser after MC.

DownLoad: Full-Size Img PowerPoint

图 3 单频固体激光器经MC滤除一部分RIN和相位噪声后对应的本底光RIN

Figure 3. RIN of local oscillator with single-frequency Nd:YVO₄ laser after MC.

DownLoad: Full-Size Img PowerPoint

图 4 单频固体激光器制备的压缩真空态光场的噪声谱, 分析频率1 MHz (分辨带宽RBW = 300 kHz, 视频带宽VBW = 200 Hz)

Figure 4. Balance homodyne measurements of the quadrature noise variances at a Fourier frequency of 1 MHz, with a resolution bandwidth RBW of 300 kHz and a video bandwidth VBW of 200 Hz.

DownLoad: Full-Size Img PowerPoint

图 5 单频光纤激光器制备的真空压缩态光场的噪声谱, 分析频率1 MHz (RBW = 300 kHz, VBW = 200 Hz)

Figure 5. Balance homodyne measurements of the quadrature noise variances at a Fourier frequency of 1 MHz, with a RBW of 300 kHz and a NBW of 200 Hz.

DownLoad: Full-Size Img PowerPoint

map

[1]	Yin J, Cao Y, Li Y H 2017 Science 356 1140 Google Scholar
[2]	霍美如, 秦际良, 孙颍榕, 成家霖, 闫智辉, 贾晓军 2018 量子光学学报 24 134 Huo M R, Qin J L, Sun Y R, Cheng J L, Yan Z H, Jia X J 2018 Acta Sin. Quantum Opt. 24 134
[3]	Bai S, Wang J Y, Qiang J, Zhang L, Wang J J 2014 Opt. Express 22 26462 Google Scholar
[4]	张逸伦, 蓝天, 高明光, 赵涛, 沈振民 2015 64 164201 Google Scholar Zhang Y L, Lan T, Gao M G, Zhao T, Shen Z M 2015 Acta Phys. Sin. 64 164201 Google Scholar
[5]	Liu J J, Chang Q, Bao M M, Yuan B, Yang K, Ma Y Q 2018 Chin. Phys. B 26 098102
[6]	姜海峰 2018 67 160602 Google Scholar Jiang H F 2018 Acta Phys. Sin. 67 160602 Google Scholar
[7]	彭世杰, 刘颖, 马文超, 石发展, 杜江峰 2018 67 167601 Google Scholar Peng S J, Liu Y, Ma W C, Shi F Z, Du J F 2018 Acta Phys. Sin. 67 167601 Google Scholar
[8]	Lu H D, Su J, Zheng Y H, Peng K C 2014 Opt. Lett. 39 1117 Google Scholar
[9]	杨文海, 王雅君, 李志秀, 郑耀辉 2014 中国激光 41 0502002 Yang W H, Wang Y J, Li Z X, Zheng Y H 2014 Chin. J. Laser 41 0502002
[10]	严雄伟, 王振国, 蒋新颖, 郑建刚, 李敏, 荆玉峰 2018 67 184201 Google Scholar Yan X W, Wang Z G, Jiang X Y, Zheng J G, Li M, Jing Y F 2018 Acta Phys. Sin. 67 184201 Google Scholar
[11]	Xu S H, Yang Z M, Zhang W N, Wei X M, Qian Q, Chen D D, Zhang Q Y, Shen S X, Peng M Y, Qiu J R 2011 Opt. Lett. 36 3708 Google Scholar
[12]	冯晋霞, 杜京师, 靳小丽, 李渊冀, 张宽收 2018 67 174203 Google Scholar Feng J X, Du J S, Jin X L, Li Y J, Zhang K S 2018 Acta Phys. Sin. 67 174203 Google Scholar
[13]	Wang Y J, Yang W H, Zheng Y H, Peng K C 2015 Chin. Phys. B 24 070303 Google Scholar
[14]	马亚云, 冯晋霞, 万振菊, 高英豪, 张宽收 2017 66 244205 Google Scholar Ma Y Y, Feng J X, Wan Z J, Gao Y H, Zhang K S 2017 Acta Phys. Sin. 66 244205 Google Scholar
[15]	Chen C Y, Li Z X, Jin X L, Zheng Y H 2016 Rev. Sci. Instrum. 87 103114 Google Scholar
[16]	Li Z X, Ma W G, Yang W H, Wang Y J, Zheng Y H, Peng K C 2016 Opt. Lett. 41 3331 Google Scholar
[17]	Yang W H, Shi S P, Wang Y J, Ma W G, Zheng Y H, Peng K C 2017 Opt. Lett. 42 4553 Google Scholar
[18]	Gardiner C W, Collett M J 1985 Phys. Rev. A 30 3761
[19]	Yang W H, Jin X L, Yu X D, Zheng Y H, Peng K C 2017 Opt. Express 25 24262 Google Scholar
[20]	Jin X L, Su J, Zheng Y H, Chen C Y, Wang W Z, Peng K C 2015 Opt. Express 23 23859 Google Scholar

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Vol. 68, Issue 12 - 2019-06-20

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