中国物理B ›› 2017, Vol. 26 ›› Issue (12): 124206-124206.doi: 10.1088/1674-1056/26/12/124206

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Generation of squeezed vacuum on cesium D2 line down to kilohertz range

Jian-Feng Tian(田剑锋), Guan-Hua Zuo(左冠华), Yu-Chi Zhang(张玉驰), Gang Li(李刚), Peng-Fei Zhang(张鹏飞), Tian-Cai Zhang(张天才)   

  1. 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;
    2. College of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China
  • 收稿日期:2017-06-07 修回日期:2017-07-18 出版日期:2017-12-05 发布日期:2017-12-05
  • 通讯作者: Yu-Chi Zhang E-mail:yczhang@sxu.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11634008, 61227902, 11574187, and 11674203), the National Key Research and Development Program of China (Grant No. 2017YFA0304500), and the Fund of "1331 Project" Key Subjects Construction of Shanxi Province, China.

Generation of squeezed vacuum on cesium D2 line down to kilohertz range

Jian-Feng Tian(田剑锋)1, Guan-Hua Zuo(左冠华)2, Yu-Chi Zhang(张玉驰)2, Gang Li(李刚)1, Peng-Fei Zhang(张鹏飞)1, Tian-Cai Zhang(张天才)1   

  1. 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;
    2. College of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China
  • Received:2017-06-07 Revised:2017-07-18 Online:2017-12-05 Published:2017-12-05
  • Contact: Yu-Chi Zhang E-mail:yczhang@sxu.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11634008, 61227902, 11574187, and 11674203), the National Key Research and Development Program of China (Grant No. 2017YFA0304500), and the Fund of "1331 Project" Key Subjects Construction of Shanxi Province, China.

摘要:

We report the experimental generation of a squeezed vacuum at frequencies ranging from 2.5 kHz to 200 kHz that is resonant on the cesium D2 line by using a below-threshold optical parametric oscillator (OPO). The OPO is based on a periodically-poled KTiOPO4 (PPKTP) crystal that is pumped using a bow-tie four-mirror ring frequency doubler. The phase of the squeezed light is controlled using a quantum noise locking technique. At a pump power of 115 mW, maximum quadrature phase squeezing of 3.5 dB and anti-squeezing of 7.5 dB are detected using a home-made balanced homodyne detector. This squeezed vacuum at an atomic transition in the kilohertz range is an ideal quantum source for quantum metrology of enhancing measurement precision, especially for ultra-sensitive measurement of weak magnetic fields when using a Cs atomic magnetometer in the audio frequency range.

关键词: quantum optics, squeezed vacuum states, optical parametric oscillators, low frequency

Abstract:

We report the experimental generation of a squeezed vacuum at frequencies ranging from 2.5 kHz to 200 kHz that is resonant on the cesium D2 line by using a below-threshold optical parametric oscillator (OPO). The OPO is based on a periodically-poled KTiOPO4 (PPKTP) crystal that is pumped using a bow-tie four-mirror ring frequency doubler. The phase of the squeezed light is controlled using a quantum noise locking technique. At a pump power of 115 mW, maximum quadrature phase squeezing of 3.5 dB and anti-squeezing of 7.5 dB are detected using a home-made balanced homodyne detector. This squeezed vacuum at an atomic transition in the kilohertz range is an ideal quantum source for quantum metrology of enhancing measurement precision, especially for ultra-sensitive measurement of weak magnetic fields when using a Cs atomic magnetometer in the audio frequency range.

Key words: quantum optics, squeezed vacuum states, optical parametric oscillators, low frequency

中图分类号:  (Quantum optics)

  • 42.50.-p
42.65.Yj (Optical parametric oscillators and amplifiers)