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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

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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  • 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.
      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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    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]

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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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  • Received Date:  17 January 2017
  • Accepted Date:  08 April 2017
  • Published Online:  05 June 2017

Measurement of audio signal by using low-frequency squeezed light

    Corresponding author: Liu Kui, liukui@sxu.edu.cn
  • 1. State Key Laboratory of Quantum Optics and Quantum Optics Devices, Collaborative Innovation Center of Extreme Optics, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
Fund Project:  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).

Abstract: 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.

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