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Measurement of intensity difference squeezing via non-degenerate four-wave mixing process in an atomic vapor |
Yu Xu-Dong (于旭东), Meng Zeng-Ming (孟增明), Zhang Jing (张靖) |
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China |
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Abstract We report the measurement of the intensity difference squeezing via the non-degenerate four-wave mixing process in a rubidium atomic vapor medium. Two pairs of balanced detection systems are employed to measure the probe and the conjugate beams, respectively. It is convenient to get the quantum shot noise limit, the squeezed and the amplified noise power spectra. We also investigate the influence of the input extra quadrature amplitude noise of the probe beam. The influence of the extra noise can be minimized and the squeezing can be optimized under the proper parameter condition. We measure the-3.7-dB intensity difference squeezing when the probe beam has a 3-dB extra quadrature amplitude noise. This result is slightly smaller than-4.1 dB when the ideal coherent light (no extra noise) for the probe beam is used.
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Received: 31 December 2012
Revised: 23 February 2013
Accepted manuscript online:
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PACS:
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42.50.-p
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(Quantum optics)
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42.50.Dv
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(Quantum state engineering and measurements)
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42.65.-k
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(Nonlinear optics)
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Fund: Project supported by the National Basic Research Program of China (Grant No. 2011CB921601), the National Natural Science Foundation of China (Grant No. 11234008), the National Natural Science Foundation of China for Excellent Research Team (Grant No. 61121064), and the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20111401130001). |
Corresponding Authors:
Zhang Jing
E-mail: jzhang74@yahoo.com; jzhang74@sxu.edu.cn
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Cite this article:
Yu Xu-Dong (于旭东), Meng Zeng-Ming (孟增明), Zhang Jing (张靖) Measurement of intensity difference squeezing via non-degenerate four-wave mixing process in an atomic vapor 2013 Chin. Phys. B 22 094204
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