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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

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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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Propagation of Uncertainty from Random Error00:59

Propagation of Uncertainty from Random Error

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An experiment often consists of more than a single step. In this case, measurements at each step give rise to uncertainty. Because the measurements occur in successive steps, the uncertainty in one step necessarily contributes to that in the subsequent step. As we perform statistical analysis on these types of experiments, we must learn to account for the propagation of uncertainty from one step to the next. The propagation of uncertainty depends on the type of arithmetic operation performed on...
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Propagation of Uncertainty from Systematic Error01:10

Propagation of Uncertainty from Systematic Error

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The atomic mass of an element varies due to the relative ratio of its isotopes. A sample's relative proportion of oxygen isotopes influences its average atomic mass. For instance, if we were to measure the atomic mass of oxygen from a sample, the mass would be a weighted average of the isotopic masses of oxygen in that sample. Since a single sample is not likely to perfectly reflect the true atomic mass of oxygen for all the molecules of oxygen on Earth, the mass we obtain from this...
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Detection of Gross Error: The Q Test01:00

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When one or more data points appear far from the rest of the data, there is a need to determine whether they are outliers and whether they should be eliminated from the data set to ensure an accurate representation of the measured value. In many cases, outliers arise from gross errors (or human errors) and do not accurately reflect the underlying phenomenon. In some cases, however, these apparent outliers reflect true phenomenological differences. In these cases, we can use statistical methods...
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The Uncertainty Principle04:08

The Uncertainty Principle

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Werner Heisenberg considered the limits of how accurately one can measure properties of an electron or other microscopic particles. He determined that there is a fundamental limit to how accurately one can measure both a particle’s position and its momentum simultaneously. The more accurate the measurement of the momentum of a particle is known, the less accurate the position at that time is known and vice versa. This is what is now called the Heisenberg uncertainty principle. He...
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Hybridization of Atomic Orbitals I03:24

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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...
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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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ボゾン量子ビットを自律量子エラー修正で保護する

Jeffrey M Gertler1, Brian Baker2, Juliang Li1

  • 1Department of Physics, University of Massachusetts Amherst, Amherst, MA, USA.

Nature
|February 11, 2021
PubMed
まとめ
この要約は機械生成です。

研究者は,カスタマイズされた分散を用いた新しい受動的量子エラー修正 (QEC) 方法を実証した. このアプローチは,超伝導量子ビットのエラーを自動で修正し,コヒーレンス時間を向上させ,量子コンピューティングのためのリソース効率の良い経路を提供します.

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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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科学分野:

  • 量子コンピューティング
  • 量子情報科学
  • 量子エラーの修正

背景:

  • 普遍的な量子コンピュータを構築するには,効果的な量子エラー修正 (QEC) が必要です.
  • 現在のQEC方法は,アクティブエラーシンドロームの測定と,ハードウェアが集約され,エラーを導入できるアダプティブ操作に依存しています.
  • オーダーメイドの分散によって自律的なQECを達成することは大きな課題でした.

研究 の 目的:

  • エンジニアリングによる分散を用いた 量子エラー修正プロトコルの実証です
  • エラーシンドロームのオペレータを 安定させるため 特に光子数対数で 超伝導体腔に
  • 量子情報を保護し ボゾン量子ビットのコヒーレンス時間を強化する

主な方法:

  • 超伝導体内のシュレディンガーの猫のようなマルチフォトン状態で論理量子ビットをコードする.
  • 連続波制御フィールドを使用して補正分散プロセスを実装します.
  • 高精度読み取りや高速デジタルフィードバックなしで,受動的なエラー修正を使用します.

主要な成果:

  • 単一フォトンの損失を自律的に修正する受動的プロトコルを示した.
  • ボゾン量子ビットのコヒーレンス時間を 2倍に増やした
  • QECは従来の洗練された要求と対照的に,控えめなハードウェアセットアップで達成されました.

結論:

  • エンジニアリングによる量子分散は,アクティブQECに資源効率的な代替手段または補足を提供します.
  • この受動的アプローチは,将来の量子コンピューティングアーキテクチャの他の故障耐性技術と互換性があります.
  • 証明された方法は,QECを実装するためのハードウェア要件を簡素化します.