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相关概念视频

Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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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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Transfer RNA Synthesis02:36

Transfer RNA Synthesis

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One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
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Mechanism of heat transfer01:19

Mechanism of heat transfer

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Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
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Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

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Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
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Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

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In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
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相关实验视频

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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使用微波光子进行确定性量子状态转移和远程纠

P Kurpiers1, P Magnard2, T Walter2

  • 1Department of Physics, ETH Zürich, Zürich, Switzerland. philipp.kurpiers@phys.ethz.ch.

Nature
|June 15, 2018
PubMed
概括

我们展示了一个超导量子比特的量子网络协议. 这种方法可以实现高保真状态传输和纠, 这对于分布式量子计算至关重要.

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相关实验视频

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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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科学领域:

  • 量子信息科学
  • 量子网络
  • 超导量子电路

背景情况:

  • 连贯的信息共享对于分布式量子信息处理至关重要.
  • 直接量子通道为容错量子计算提供了优势,因为它允许确定性纠.
  • 超导电路可以作为通用量子节点进行复杂的量子运算.

研究的目的:

  • 在单独的芯片上实现超导量子位之间的确定性状态传输和纠协议.
  • 建立一个直接的量子通道以提高纠率和分布式量子计算.
  • 展示超导电路在构建强大的量子网络中的潜力.

主要方法:

  • 使用全微波腔辅助的拉曼过程.
  • 纠的超导量子比特 (转子类型的人造原子) 与移动的单个光子.
  • 在接收节点通过光子吸收实现状态转移.

主要成果:

  • 在180纳秒内以98.1%的概率和80.02%的准确性证明了量子位状态转移.
  • 在50千赫的频率下实现78.9%的远程纠.
  • 结果与总方程模拟非常一致.

结论:

  • 实施的确定性协议是建立分布式量子计算系统的重要一步.
  • 这种方法为量子网络中可靠的信息共享提供了可行的方法.
  • 对于未来的量子网络应用来说, 高保真度和纠率是有前途的.