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相关概念视频

Quantum Numbers02:43

Quantum Numbers

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.
The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not contribute to...
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
Scanning Electron Microscopy01:07

Scanning Electron Microscopy

A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
Fundamental Principles
Accelerated...

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相关实验视频

Updated: May 13, 2026

Compact Quantum Dots for Single-molecule Imaging
17:14

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

在量子点中单个电子自旋的单次射击读出.

J M Elzerman1, R Hanson, L H Willems Van Beveren

  • 1Kavli Institute of Nanoscience Delft and ERATO Mesoscopic Correlation Project, Delft University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands.

Nature
|July 23, 2004
PubMed
概括
此摘要是机器生成的。

研究人员展示了第一次对半导体量子点中的单个电子自旋进行电气单次测量. 量子信息科学的这一突破为电力阅读自旋状态提供了一种新方法.

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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
14:58

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Published on: June 3, 2015

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

相关实验视频

Last Updated: May 13, 2026

Compact Quantum Dots for Single-molecule Imaging
17:14

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
14:58

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Published on: June 3, 2015

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

科学领域:

  • 量子物理学 量子物理学 是一种量子物理学.
  • 凝聚物质物理学 凝聚物质物理学
  • 纳米技术纳米技术

背景情况:

  • 旋转是电子等基本粒子的一个基本量子力学属性.
  • 单个旋转对于量子信息处理至关重要,但电气读取仍然是一个挑战.
  • 目前用于单旋转的读出方法主要是基于光学或力显微镜.

研究的目的:

  • 展示一种用于单个电子自旋状态的单次电气测量的新方法.
  • 克服量子信息应用现有的读出技术的局限性.
  • 评估使用电子自旋在半导体量子点中用于量子信息的可行性.

主要方法:

  • 在半导体量子点中单个电子自旋状态的电气一次性测量.
  • 使用单个电子的自旋电荷转换被限制在量子点内.
  • 使用敏感的量子点接触探测器检测单个电子电荷.

主要成果:

  • 成功地实现了单个电子自旋状态的单次电气测量.
  • 旋转测量可见度约为65%被证明.
  • 观察到异常长的单旋能量放松时间 (在8 T时高达0.85 ms).

结论:

  • 现在可以实现半导体量子点中单个电子自旋的电读出.
  • 证明的技术和长时间的放松时间对量子信息应用有希望.
  • 这项工作为利用电子自旋的可扩展量子计算架构铺平了道路.