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相关概念视频

Electron Orbital Model01:18

Electron Orbital Model

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Orbitals are the areas outside of the atomic nucleus where electrons are most likely to reside. They are characterized by different energy levels, shapes, and three-dimensional orientations. The location of electrons is described most generally by a shell or principal energy level, then by a subshell within each shell, and finally, by individual orbitals found within the subshells.
The first shell is closest to the nucleus, and it has only one subshell with a single spherical orbital called the...
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The Quantum-Mechanical Model of an Atom02:45

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Overview of Molecular Orbital Theory
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sp3d and sp3d 2 Hybridization
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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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Atomic Nuclei: Larmor Precession Frequency01:11

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The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
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基于无人机的轨道角动量量子密钥分布的甜甜圈咬人的光子捕获方案.

Jiahao Li, Hui Han, Jinquan Huang

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    概括

    基于无人机的量子密钥分配 (QKD) 使用轨道角动量 (OAM) 进行安全通信. 一个新的"甜甜圈"方案将传输距离提高50%以上,使长距离的自由空间量子网络成为可能.

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    科学领域:

    • 量子通信是一种量子通信.
    • 光学和光子学 在光学和光子学.
    • 自由空间光学自由空间光学

    背景情况:

    • 基于无人机的量子密钥分发 (QKD) 为扩展空间和时间量子通信提供了一种灵活的方法.
    • 在高维QKD (HD-QKD) 中编码轨道角动量 (OAM) 提高了通信能力和稳定性.
    • 目前基于无人机的OAM-QKD受限于由于OAM状态依赖的衍射,需要大光圈望远镜.

    研究的目的:

    • 提出和评价一个小说.
    • 甜甜圈咬人的甜甜圈咬人
    • 基于无人机的OAM-QKD的光子捕获方案.
    • 为了比较OAM编码QKD的中心对齐 (CA) 和中心不对齐 (CM) 接收方案的性能.
    • 为了扩大无人机OAM-QKD系统的传输距离.

    主要方法:

    • 使用无人机平台建立一个移动空对空OAM编码的QKD模型.
    • 基于OAM强度分布的CA和CM接收计划的比较.
    • 数字模拟来分析系统性能和传输距离.

    主要成果:

    • 该CA计划提供更简单的准和更高的信息容量在短距离.
    • 该CM计划延长了传输距离,并提供了数据速率的优势.
    • 拟议的"甜甜圈咬伤"方案将在5-20厘米接收光圈范围内,至少增加50.5%的传输距离.

    结论:

    • "甜甜圈"方案显著提高了基于无人机的OAM-QKD的传输距离.
    • 该方案为自由空间中长途OAM编码的QKD提供了一个实用的框架.
    • 这些发现有助于开发集成的空间到地面量子通信网络.