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Light Acquisition02:16

Light Acquisition

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In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
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When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Patterned Photostimulation with Digital Micromirror Devices to Investigate Dendritic Integration Across Branch Points
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一个纠的发光二极管.

C L Salter1, R M Stevenson, I Farrer

  • 1Toshiba Research Europe Limited, 208 Cambridge Science Park, Cambridge CB4 0GZ, UK.

Nature
|June 4, 2010
PubMed
概括
此摘要是机器生成的。

研究人员使用发光二极管 (LED) 中的量子点开发了一种电驱动的纠光子对源. 这种按需的纠光子源对于可扩展的量子信息应用至关重要.

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相关实验视频

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科学领域:

  • 量子信息科学 量子信息科学
  • 光电学是指光电子产品.
  • 固态物理 固态物理

背景情况:

  • 传统的量子计算依赖于纠的光子,但当前的源 (例如,参数向下转换) 是光学驱动的,重的,并且概率有限.
  • 现有源受到概率发射的影响,阻碍了量子计算操作和可扩展性的成功率.
  • 电力驱动的,按需的纠光子对源的开发是实际量子计算的关键未满足需求.

研究的目的:

  • 为了实现电驱动的纠光子对源.
  • 为了证明使用半导体量子点产生纠光子的可行性.
  • 评估用于量子信息应用开发的纠光子源的性能和可靠性.

主要方法:

  • 在半导体发光二极管 (LED) 结构中整合一个量子点,以创建一个纠发光二极管 (ELED).
  • 在直流 (d.c.) 和交流电流 (a.c.) 电注下纠的光子对发射的表征.
  • 使用已建立的量子光学测量技术量化纠准确度.

主要成果:

  • 成功展示了一种电驱动的纠光子对的电源.
  • 在空调注射下达到高纠保真度高达0.82,在空调注射下达到高纠保真度.
  • 该设备作为按需源运行,消除了对复杂激光驱动系统的需求.

结论:

  • 开发的纠发光二极管 (ELED) 是朝着可扩展的量子信息技术的重大进步.
  • 通过电气注入的高保真性纠光子生成克服了当前光源的局限性.
  • ELED是未来量子计算,量子继电器和纠交换应用的有希望的平台.