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基于低频压缩光的声频信号测量

闫子华 孙恒信 蔡春晓 马龙 刘奎 郜江瑞

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基于低频压缩光的声频信号测量

闫子华, 孙恒信, 蔡春晓, 马龙, 刘奎, 郜江瑞

Measurement of audio signal by using low-frequency squeezed light

Yan Zi-Hua, Sun Heng-Xin, Cai Chun-Xiao, Ma Long, Liu Kui, Gao Jiang-Rui
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  • 低频信号测量在引力波探测、生物成像及磁场测量等方面具有重要的应用价值.本文利用非简并光学参量放大器获得了低频压缩态光场,在频率19 kHz处直接测到的压缩度为(7.1±0.1)dB;将产生的正交位相压缩态光场注入到马赫-曾德尔干涉仪中,实现了超越散粒噪声极限(3.0±0.4)dB的声频相位信号的测量.本实验的开展为低频压缩光的产生及基于低频压缩光的声频信号测量提供了一定技术支撑,并且此技术有望扩展到磁场、空间小位移等其他物理量的量子精密测量方案中.
    Measurement of audio signal plays a significant role in many applications, such as gravitational wave detection, bio-particle imaging and magnetometer. In this paper, low-frequency squeezed light is generated by a non-degenerate optical parametric amplifier. In order to avoid the effect of injected light on low-frequency squeezing, an auxiliary laser is used to lock the length of non-degenerate optical parametric amplifier and a method of locking quantum noise is employed to lock the phase between the local light and the squeezed light. By isolating the vibration noises at low-frequency and reducing back action of parasitic interference, the squeezing of (7.1±0.1) dB takes place at 19 kHz. Then the squeezed light is injected into the Mach-Zehnder interferometer to measure an audio signal which drives a piezoelectric transducer to generate a small phase variation between two arms of Mach-Zehnder interferometer. According to the low-frequency squeezing, we realize experimentally the measurement of phase signal at audio frequency which exceeds the shot-noise limit of (3.0±0.4) dB. The experiment provides technical supports for the generation of low-frequency squeezed light and the measurement of audio signal. Furthermore it can be extended to other quantum measurements, such as high-precision magnetometer and measurement of small-displacement.
      通信作者: 刘奎, liukui@sxu.edu.cn
    • 基金项目: 国家自然科学基金(批准号:61405108,11674205,11604189)、国家自然科学基金重点项目(批准号:91536222)、国家重点研发计划(批准号:2016YFA0301404)、国家高技术研究发展计划(批准号:2015AA8112008)和山西省高校科技创新项目(批准号:2015103)资助的课题.
      Corresponding author: Liu Kui, liukui@sxu.edu.cn
    • Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 61405108, 11674205, 11604189), the Key Program of the National Natural Science Foundation of China (Grant No. 91536222), the National Key Research and Development Program of China (Grant No. 2016YFA0301404), the National High Technology Research and Development Program of China (Grant No. 2015AA8112008), and the University Science and Technology Innovation Project in Shanxi Province, China (Grant No. 2015103).
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  • [1]

    Giovannetti V, Lloyd S, Maccone L 2011 Nat. Photon. 5 222

    [2]

    Giovannetti V, Lloyd S, Maccone L 2006 Phys. Rev. Lett. 96 010401

    [3]

    Vahlbruch H, Mehmet M, Danzmann K, Schnable R 2016 Phys. Rev. Lett. 117 110801

    [4]

    Sun H X, Liu K, Zhang J X, Gao J R 2015 Acta Phys. Sin. 64 234210 (in Chinese) [孙恒信, 刘奎, 张俊香, 郜江瑞 2015 物理学报 64 234210]

    [5]

    Sun H X, Liu Z L, Liu K, Yang R G, Zhang J X, Gao J R 2014 Chin. Phys. Lett. 31 084202

    [6]

    Horrom T, Singh R, Dowling J P, Mikhailov E E 2012 Phys. Rev. A 86 023803

    [7]

    Stefszky M S, Mow-Lowry C M, Chua S S Y, Shaddock D A, Buchler B C, Vahlbruch H, Khalaidovski A, Schnable R, Lam P K, McClelland D E 2012 Class. Quant. Gray. 29 145015

    [8]

    McKenize K, Grosser N, Bowen W P, Whitcomb S E, Gray M B, McClelland D E, Lam P K 2004 Phys. Rev. Lett. 93 161105

    [9]

    Vahlbruch H, Chelkowski S, Danzmann K, Schnabel R 2007 New J. Phys. 9 371

    [10]

    Liu C J, Jing J T, Zhou Z F, Pooser R C, Hudelist F, Zhou L, Zhang W P 2011 Opt. Lett. 36 2979

    [11]

    Qin Z Z, Jing J T, Zhou J, Liu C J, Pooser R C, Zhou Z F, Zhang W P 2012 Opt. Lett. 37 3141

    [12]

    Liu Z J, Zhai Z H, Sun H X, Gao J R 2016 Acta Phys. Sin. 65 060401 (in Chinese) [刘增俊, 翟泽辉, 孙恒信, 郜江瑞 2016 物理学报 65 060401]

    [13]

    Taylor M A, Janousek J, Daria V, Knittel J, Hage B, Hachor H A, Bowen W P 2013 Nat. Photon. 7 229

    [14]

    Abbott B P, et al. (LIGO Scientific Collaboration and Virgo Collaboration) 2016 Phys. Rev. Lett. 116 061102

    [15]

    Bachor H A, Ralph T C 2004 A Guide to Experiment in Quantum Optics (2nd Ed.) (Berlin: Wiley-Vch) pp115-119

    [16]

    Barnett S M, Fabre C, Maitre A 2003 Eur. Phys. J. D 22 513

    [17]

    Black E D 2001 Am. J. Phys. 69 79

    [18]

    Ou Z Y, Pereira S F, Kimble H J 1992 Phys. Rev. Lett. 68 3663

    [19]

    Ma Y Y, Feng J X, Sun Z N, Wan Z J, Zhang K S 2016 J. Quant. Opt. 22 1 (in Chinese) [马亚云, 冯晋霞, 孙志妮, 万振菊, 张宽收 2016 量子光学学报 22 1]

    [20]

    Zhang Y, Su H, Xie C D, Peng K C 1999 Phys. Lett. A 259 171

    [21]

    Li X Y, Jing J T, Zhang J, Pan Q, Xie C D, Peng K C 2002 Acta Phys. Sin. 51 966 (in Chinese) [李小英, 荆杰泰, 张靖, 潘庆, 谢常德, 彭堃墀 2002 物理学报 51 966]

    [22]

    Yang S R, Li Y M, Zhang S J, Zhang K S 2006 Acta Sin. Quant. Opt. 2 92 (in Chinese) [杨树荣, 李永民, 张苏净, 张宽收 2006 量子光学学报 2 92]

    [23]

    Zhang Y, Yu X D, Di K, Li W, Zhang J 2013 Acta Phys. Sin. 62 084204 (in Chinese) [张岩, 于旭东, 邸克, 李卫, 张靖 2013 物理学报 62 084204]

    [24]

    Kirk M K, Eugeniy E M, Keisuke G, Ping K L, Nicolai G, Malcolm B G, Nergis M, David E M 2005 J. Opt. B 7 421

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出版历程
  • 收稿日期:  2017-01-17
  • 修回日期:  2017-04-08
  • 刊出日期:  2017-06-05

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