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関連する概念動画

Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

2.2K
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...
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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.6K
The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

61.0K
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:
61.0K
Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

3.5K
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...
3.5K
Colors and Magnetism03:02

Colors and Magnetism

14.5K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
14.5K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

1.4K
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.
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Single-molecule Manipulation of G-quadruplexes by Magnetic Tweezers
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モレキュラー 4f シングルイオン・マグネット・キュービットへ

Kasper S Pedersen1,2, Ana-Maria Ariciu3, Simon McAdams3

  • 1CNRS, CRPP, UPR 8641 , F-33600 Pessac, France.

Journal of the American Chemical Society
|April 23, 2016
PubMed
まとめ

量子コヘランスは,EPR光譜を用いて,Yb (trensal) シングルイオン磁石で観測された. この発見は,量子情報処理アプリケーションの有望な材料としてYb (trensal) を強調しています.

さらに関連する動画

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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科学分野:

  • 量子物理学
  • 材料科学
  • スペクトロスコーピー

背景:

  • シングルイオン磁石 (SIM) は量子情報処理に不可欠です
  • Yb ((trensal)) は化学的に変化し,昇華可能なSIMです.

研究 の 目的:

  • 量子コヒーレンスを検知し,特徴づけること.
  • 量子情報処理の適性を評価する.

主な方法:

  • イソトープ選択式パルス電子パラマグネティック共振 (EPR) スペクトロスコーピー
  • Yb ((trensal)) のオリエンテッド・シングル・クリスタルを使用した.
  • X帯の周波数で測定した.

主要な成果:

  • 量子コヒーレンスが成功しました
  • スピン・グリッドのリラクゼーション (T1) と相記憶 (Tm) 時間は核のスピンとは無関係であった.
  • スピンエコーのラビ振動が観察され,70回以上の回転で一貫した操作が示されました.

結論:

  • Yb ((trensal)) は強固な量子コヒーレンスを示している.
  • 観測されたコヒーレント操作能力は,量子コンピューティングの強力な候補となる.
  • その性質は,スケーラブルな量子情報処理に有利です.