Broadband Miniaturized All-Fiber Source with an Intensity-Difference Squeezed State

Ang Sun; Xueshi Guo; Wen Zhao; Xiaoying Li

doi:10.3788/LOP222909

Journals >Laser & Optoelectronics Progress >Volume 60 >Issue 11 >Page 1106031 > Article

Laser & Optoelectronics Progress
Vol. 60, Issue 11, 1106031 (2023)

Broadband Miniaturized All-Fiber Source with an Intensity-Difference Squeezed State

Ang Sun^1、2、*, Xueshi Guo^1、2, Wen Zhao^1、2, and Xiaoying Li^1、2

Author Affiliations

¹School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China

²Key Laboratory of Opto-Electronic Information Technology, Ministry of Education, Tianjin 300072, China

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DOI: 10.3788/LOP222909 Cite this Article Set citation alerts

Ang Sun, Xueshi Guo, Wen Zhao, Xiaoying Li. Broadband Miniaturized All-Fiber Source with an Intensity-Difference Squeezed State[J]. Laser & Optoelectronics Progress, 2023, 60(11): 1106031 Copy Citation Text

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Abstract

In this study, a miniaturized light source with an intensity-difference squeezed state is fabricated. The light source uses a dispersion-shifted fiber as the nonlinear medium, and its pulse pump light repetition frequency is approximately 50 MHz. The light source has a stable structure and small size. The intensity difference compression characteristics of the light source in a wide range of frequencies are measured and analyzed using a broadband wide difference detector. The results show that the intensity difference noise measured at a frequency less than 65 MHz at room temperature is lower than the shot noise limit; furthermore, the intensity difference compression at 20 MHz is about 3.8 dB. This study lays a foundation for the measurement of the intensity difference squeeze in time domain.

Keywords

continuous variable quantum light source intensity difference squeezed state optical fiber parametric amplifier squeezed state of light

\{\begin{matrix} {\hat{b}}_{s} = μ {\hat{a}}_{s} + ν {\hat{a}}_{i}^{†} \\ {\hat{b}}_{i} = μ {\hat{a}}_{i} + ν {\hat{a}}_{s}^{†} \end{matrix}

，（1）

\begin{array}{l} I_{s} = | μ |^{2} | α |^{2} + | ν |^{2} \\ I_{i} = | ν |^{2} | α |^{2} + | ν |^{2} \end{array}

，（2）

g = {|μ|}^{2}

，（3）

R_{t} = \frac{〈Δ {I_{t}}^{2}〉}{〈Δ {I_{c}}^{2}〉} = \frac{1}{| μ |^{2} + | ν |^{2}}

，（4）

R_{t} (η_{s}, η_{i}) = \frac{2 | μ |^{2} | ν |^{2} {(η_{s} - η_{i})}^{2} + η_{i} | ν |^{2} - 2 η_{i}^{2} | ν |^{2} + η_{s} | μ |^{2}}{η_{s} | μ |^{2} + η_{i} | ν |^{2}}

，（5）

{\hat{i}}_{p t} (t) = \sum_{n = 0}^{\infty} {\hat{I}}_{n} q (t + n T)

，（6）

Ang Sun, Xueshi Guo, Wen Zhao, Xiaoying Li. Broadband Miniaturized All-Fiber Source with an Intensity-Difference Squeezed State[J]. Laser & Optoelectronics Progress, 2023, 60(11): 1106031

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