| Einstein——Podolsky——Rosen entanglement in time-dependent periodic pumping non-degenerate optical parametric amplifier |
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| 引用本文： | 赵超樱,谭维翰.Einstein——Podolsky——Rosen entanglement in time-dependent periodic pumping non-degenerate optical parametric amplifier[J].中国物理 B,2009,18(10):4143-4153. |
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| 作者姓名： | 赵超樱 谭维翰 |
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| 作者单位： | (1)Department of Physics, Shanghai University, Shanghai
200444, China; (2)Institute of Materials Physics, Hangzhou Dianzi
University, Hangzhou 310018, China;The State Key Laboratory of Quantum Optics and Quantum
Optics Devices, Institute of Opto-Electronics,
Shanxi University,
Taiyuan 030006, China |
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| 基金项目： | Project
supported by the Natural Science Foundation of Shanxi Province,
China (Grant No 2006011003). |
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| 摘 要： | The solution of the time-dependent periodic pumping non-degenerate
optical parametric amplifier (NOPA) is derived when the pump
depletion is considered both above and below thresholds. Based on
this solution, the quantum fluctuation calculated shows that a high
entanglement and a good squeezing degree of the parametric light
beams are achieved near and above thresholds. We adopt two kinds of
pump fields: (i) a continuously modulated pump with a sinusoidal
envelope; (ii) a sequence of laser pulses with Gaussian envelopes.
We analyse the time evolution of continuous variable entanglement by
analytical and numerical calculations, and show that the periodic
driven pumping also improves the degree of entanglement. The
squeezing and Einstein-Podolsky-Rosen (EPR) entanglement by using
the two pumping driven functions are investigated from below to
above the threshold regions, the tendencies are nearly the same, and the
Gaussian driven function is superior to that of the sine driven function,
when the maximum squeezing and the minimum variance of
quantum fluctuation are considered. In the meantime, the
generalization of frequency degenerate OPA to frequency
non-degenerated OPA problem is investigated.
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| 关 键 词： | EPR entanglement periodic pumping non-degenerate optical parametric amplifier |
| 收稿时间： | 7/3/2008 12:00:00 AM |
Einstein--Podolsky--Rosen entanglement in time-dependent periodic pumping non-degenerate optical parametric amplifier |
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| Zhao Chao-Ying and Tan Wei-Han.Einstein--Podolsky--Rosen entanglement in time-dependent periodic pumping non-degenerate optical parametric amplifier[J].Chinese Physics B,2009,18(10):4143-4153. |
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| Authors: | Zhao Chao-Ying and Tan Wei-Han |
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| Affiliation: | Institute of Materials Physics, Hangzhou Dianzi University, Hangzhou 310018, China; The State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China; Department of Physics, Shanghai University, Shanghai 200444, China |
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| Abstract: | The solution of the time-dependent periodic pumping non-degenerate
optical parametric amplifier (NOPA) is derived when the pump
depletion is considered both above and below thresholds. Based on
this solution, the quantum fluctuation calculated shows that a high
entanglement and a good squeezing degree of the parametric light
beams are achieved near and above thresholds. We adopt two kinds of
pump fields: (i) a continuously modulated pump with a sinusoidal
envelope; (ii) a sequence of laser pulses with Gaussian envelopes.
We analyse the time evolution of continuous variable entanglement by
analytical and numerical calculations, and show that the periodic
driven pumping also improves the degree of entanglement. The
squeezing and Einstein-Podolsky-Rosen (EPR) entanglement by using
the two pumping driven functions are investigated from below to
above the threshold regions, the tendencies are nearly the same, and the
Gaussian driven function is superior to that of the sine driven function,
when the maximum squeezing and the minimum variance of
quantum fluctuation are considered. In the meantime, the
generalization of frequency degenerate OPA to frequency
non-degenerated OPA problem is investigated. |
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| Keywords: | EPR entanglement periodic
pumping non-degenerate optical parametric amplifier |
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