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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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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...
1.9K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

1.1K
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
1.1K
Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

3.0K
All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
3.0K
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

870
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
870
Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

5.1K
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...
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在单分子磁铁中的电驱动核自旋共振.

Stefan Thiele1, Franck Balestro2, Rafik Ballou1

  • 1CNRS, Inst NEEL, F-38042 Grenoble, France. Université Grenoble Alpes, Inst NEEL, F-38042 Grenoble, France.

Science (New York, N.Y.)
|June 7, 2014
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概括

科学家们展示了量子比特的核旋转的电气控制. 这种方法使用了超细的斯塔克效应,可以更快,更局部地操纵基于核旋转的量子设备.

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科学领域:

  • 量子计算是一种量子计算.
  • 原子物理 原子物理
  • 固态物理 固态物理

背景情况:

  • 孤立的核旋转对于开发基于核旋转的量子比特至关重要.
  • 核旋转的连贯操纵通常依赖于局部磁场.
  • 电气操纵为旋转控制提供了速度和空间限制方面的优势.

研究的目的:

  • 提出和演示一种只使用电场的连贯单核旋转操纵方法.
  • 探索基于核旋转的量子设备的电气控制潜力.

主要方法:

  • 利用超细的斯塔克效应作为一个原子级磁场转换器.
  • 应用电场来实现核自旋状态的连贯操纵.
  • 研究核自旋系统中的量子力学过程,例如中的或.

主要成果:

  • 仅通过电场成功证明了连贯的单核自旋操纵.
  • 验证超细的斯塔克效应作为电气自旋控制的可行机制.
  • 确认该方法适用于各种核自旋系统.

结论:

  • 在没有直接磁场应用的情况下,可以实现核旋转的电气操纵.
  • 超细的斯塔克效应为基于核旋转的量子技术中的电气控制提供了通用的途径.
  • 这一突破为先进的电控量子设备铺平了道路.