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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

54.0K
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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π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds01:14

π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds

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In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
1.4K
The de Broglie Wavelength02:32

The de Broglie Wavelength

31.1K
In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
31.1K
Calculations of Electric Potential I01:15

Calculations of Electric Potential I

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Consider a ring of radius R with a uniform charge density λ. What will the electric potential be at point M, which is located on the axis of the ring at a distance x from the center of the ring?
The ring is divided into infinitesimal small arcs such that point M is equidistant from all the arcs. Here, the cylindrical coordinate system is used to calculate the electric potential at point M. A general element of the arc between angles θ and θ + dθ is of the length Rdθ and has a charge of...
2.3K
The Bohr Model02:18

The Bohr Model

76.4K
Following the work of Ernest Rutherford and his colleagues in the early twentieth century, the picture of atoms consisting of tiny dense nuclei surrounded by lighter and even tinier electrons continually moving about the nucleus was well established. This picture was called the planetary model since it pictured the atom as a miniature “solar system” with the electrons orbiting the nucleus like planets orbiting the sun. The simplest atom is hydrogen, consisting of a single proton as the...
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Electronic Structure of Atoms02:28

Electronic Structure of Atoms

26.4K

An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum...
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関連する実験動画

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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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量子リングの電子特性を正確に計算する

C Neill1, T McCourt1, X Mi1

  • 1Google Quantum AI, Mountain View, CA, USA.

Nature
|June 24, 2021
PubMed
まとめ

この研究は,超伝導量子ビットを用いて 凝縮物質システムを調査する正確な量子シミュレーション方法を提示しています. このアプローチは高精度で 新しい量子材料の探索を可能にします

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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Gradient Echo Quantum Memory in Warm Atomic Vapor
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関連する実験動画

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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Gradient Echo Quantum Memory in Warm Atomic Vapor
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科学分野:

  • 量子シミュレーション
  • 凝縮物質物理学
  • 超伝導クビット

背景:

  • 量子シミュレーションは 複雑な凝縮物質システムを研究する 有望な手段です
  • 現在の量子シミュレーション方法は,古典的な計算アプローチを上回るのに必要な精度が欠けている.

研究 の 目的:

  • 凝縮物質システムの基本的な電子性質を調査するための正確な量子シミュレーション・ブループリントを開発し,実証する.
  • 一次元ワイヤのバンド構造を再構築することによってシミュレーション方法をベンチマークする.

主な方法:

  • 量子シミュレーションのための18超伝導量子ビットプラットフォームを使用しました.
  • 読み取りの誤差を軽減するための技術
  • エネルギー固有値とスペクトル特性を分析するためにフーリエ変換を使用した.
  • 合成された磁気流と 乱れた局所的ポテンシャル 凝縮された物質の条件を模倣する

主要な成果:

  • 約0.01radの誤差でエネルギー固有値の高精度測定を達成した.
  • 固有エネルギーを解くのに 10^-4 rad の統計的不確実性を示した.
  • 磁気流を横切る際の レベルクロスを回避し,不規則な分布を明らかにした.
  • 再構築された電子特性,持続電流と乱れによる導電抑制を含む.

結論:

  • 凝縮物質システムの研究に適した正確な量子シミュレーション方法を開発した.
  • このアプローチは 超伝導量子ビットを用いて 新しい量子材料の探索の道を開きます
  • 量子コンピューティングの鍵となるエラーを 軽減し,シミュレーションの信頼性を高めました.