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相关概念视频

Phase Contrast and Differential Interference Contrast Microscopy01:26

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...
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相关实验视频

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Gradient Echo Quantum Memory in Warm Atomic Vapor
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在第三级集成光学参数振荡器中的量子态断层扫描.

Roger Alfredo Kögler, Gabriel Couto Rickli, Renato Ribeiro Domeneguetti

    Optics letters
    |June 2, 2024
    PubMed
    概括

    研究人员用光学参数振荡器测量了量子挤压. 在观察显著的振幅挤压时,过多的噪声阻止了纠,突出了量子系统中相位噪声控制的需要.

    科学领域:

    • 量子光学就是一个量子光学.
    • 非线性光学是一种非线性光学.
    • 综合光子学 综合光子学

    背景情况:

    • 光学参数振荡器 (OPO) 对于产生非经典光状态至关重要.
    • 集成光子学为量子光学实验提供了小型化的平台.
    • 了解场相关性对于量子信息处理至关重要.

    研究的目的:

    • 测量第三阶集成光学参数振荡器 (OPO) 中场的共变矩阵.
    • 量化量子挤压和评估纠生成能力.
    • 调查功率对噪声特性和相关性的影响.

    主要方法:

    • 使用了一个集成的第三级光学参数振荡器,在值以上运行.
    • 测量了生成光学场的共变矩阵.
    • 分析了振幅和相位相关性,以及状态纯度.

    主要成果:

    • 在振幅差异中观察到2.3 ± 0.3dB的挤压.
    • 在芯片上压缩的推论为4.9 ± 0.7 dB.
    • 在联方格中发现过量噪声,阻碍了纠.
    • 随着功率的增加,观察到振幅相关性和状态纯度的退化.

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  • 相关的增加相位噪声与减少的相关性和纯度.

    • 结论:

    • 集成的OPO表现出显著的振幅挤压.
    • 在特定的正方形中,过度的噪音限制了纠状态的产生.
    • 阶段噪声随着功率的增加而增加,降低相关性和纯度.
    • 有效的相位噪声控制策略是必要的,以实现这些集成系统的纠.