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Open AccessArticle

Two-Color Quantum Correlation between Down-Conversion Beams at 1.5 and 3.3 μm from a Singly Resonant Optical Parametric Oscillator

by Dandan Nie 1, Jinxia Feng 1,2, Yuanji Li 1,2 and Kuanshou Zhang 1,2,*
1
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
2
Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(8), 2698; https://doi.org/10.3390/app10082698
Received: 26 March 2020 / Revised: 10 April 2020 / Accepted: 11 April 2020 / Published: 14 April 2020
(This article belongs to the Section Quantum Science and Technology)
We demonstrated a two-color quantum correlation between the down-conversion beams with a telecommunication wavelength at 1.5 μm and mid-infrared wavelength at 3.3 μm generated by a singly resonant optical parametric oscillator (SRO) operated above the pump threshold with a magnesium-oxide doped periodically-poled lithium niobate crystal in the cavity. A maximum of 1.8 dB noise reduction of the intensity difference of the twin beams was measured at the analysis frequency of 5 MHz. Based on a theoretical model for the quantum correlation between the twin beams given by a semi-classical approach, the influence of the analysis frequency and pump parameter on the quantum correlation between the twin beams was discussed theoretically and experimentally. The quantum correlation between the twin beams was degraded at the analysis frequencies above 5 MHz due to the limitation of the bandwidth of SRO cavity and was degraded at the analysis frequencies below 5 MHz due to the excess intensity noise of the pump. The two-color quantum correlated twin beams at 1.5 and 3.3 μm have potential applications in high-precision measurements beyond the shot noise level. View Full-Text
Keywords: quantum correlation; twin beams; singly resonant optical parametric oscillator; telecommunication wavelength at 1.5 μm; mid-infrared wavelength at 3.3 μm quantum correlation; twin beams; singly resonant optical parametric oscillator; telecommunication wavelength at 1.5 μm; mid-infrared wavelength at 3.3 μm
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Nie, D.; Feng, J.; Li, Y.; Zhang, K. Two-Color Quantum Correlation between Down-Conversion Beams at 1.5 and 3.3 μm from a Singly Resonant Optical Parametric Oscillator. Appl. Sci. 2020, 10, 2698.

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