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関連する概念動画

The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

42.4K
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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Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

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sp3d and sp3d 2 Hybridization
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Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

47.2K
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...
47.2K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.0K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.0K
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

1.8K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
1.8K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.0K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.0K

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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中性原子量子コンピュータの高精度並列絡みゲート

Simon J Evered1, Dolev Bluvstein1, Marcin Kalinowski1

  • 1Department of Physics, Harvard University, Cambridge, MA, USA.

Nature
|October 11, 2023
PubMed
まとめ

研究者は中性原子量子コンピューティングで2量子ビットエンタグリングゲートの99.5%の精度を達成し,スケーラブルな量子情報処理とエラー修正の重要なステップとなりました.

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Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Published on: September 5, 2019

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Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
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Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

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科学分野:

  • 量子情報科学
  • 原子物理学
  • 量子コンピューティング

背景:

  • 拡張可能で誤差が少ない量子操作は 量子情報処理に不可欠です
  • 中性原子配列は高量子ビット数と再構成可能な接続性を持つ有望なプラットフォームを提供します.
  • リードバーグ相互作用によって媒介されるゲートにおけるエラーを減らすことは,依然として重要な課題です.

研究 の 目的:

  • ニュートラル原子配列で 高精度2量子ビットの 絡み合いを実現する
  • このゲートを使うと,エラー修正の値を超えます.
  • マルチキビットゲートに対するメソッドのスケーラビリティと適用性を実証する.

主な方法:

  • 最適な制御を介して最適化された高速の単発ゲートを使用しました.
  • 散乱の誤差を最小限に抑えるために,原子の暗状態を使用した.
  • リドバーグ刺激と原子冷却の技術を改良した.
  • 60個の原子に対して並列ゲート操作を行いました.

主要な成果:

  • 2量子ビットのゲートで 99.5%の精度を達成した
  • 60個の原子で平行ゲート操作を証明し,表面コードの値を超えました.
  • 低誤差の3キビットゲートを成功裏に実現しました
  • 物理的なエラー源を特徴付け,ゲートアプリケーションを繰り返し検証した.

結論:

  • 中性原子系における高精度絡み込みゲートの方法を開発した.
  • 達成されたフィデリティはスケーラブルな量子コンピューティングと エラー修正の道を開きます
  • この技術は,複合量子アルゴリズムとシミュレーションを可能にする,マルチキビットゲートに一般化できます.