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Chin. Phys. B, 2017, Vol. 26(12): 124206    DOI: 10.1088/1674-1056/26/12/124206
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

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. 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
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.

Keywords:  quantum optics      squeezed vacuum states      optical parametric oscillators      low frequency  
Received:  07 June 2017      Revised:  18 July 2017      Accepted manuscript online: 
PACS:  42.50.-p (Quantum optics)  
  42.65.Yj (Optical parametric oscillators and amplifiers)  
Fund: 

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.

Corresponding Authors:  Yu-Chi Zhang     E-mail:  yczhang@sxu.edu.cn

Cite this article: 

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) Generation of squeezed vacuum on cesium D2 line down to kilohertz range 2017 Chin. Phys. B 26 124206

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