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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

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. Schrödinger...
Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
Deactivation Processes: Jablonski Diagram01:25

Deactivation Processes: Jablonski Diagram

Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
Fermi Level Dynamics01:12

Fermi Level Dynamics

The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
The Joule and Joule–Thomson Experiments01:23

The Joule and Joule–Thomson Experiments

Consider an adiabatic system composed of two chambers, A and B, designed such that no heat flows into or out of the system. Initially, chamber A is filled with a gas at a fixed temperature T1, pressure p1, and volume V1, while chamber B is evacuated. The gas is then gradually forced through a rigid, porous barrier to chamber B, ultimately reaching temperature T2, pressure p2, and volume V2. A piston on the right side maintains a constant pressure (p2), which is lower than p1. The significant...

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Rapid Subtractive Patterning of Live Cell Layers with a Microfluidic Probe
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IBM量子プロセッサにおける蒸留閾値を超えるマジック状態注入

Younghun Kim1,2, Martin Sevior3, Muhammad Usman3,4

  • 1School of Physics, The University of Melbourne, Parkville, 3010, VIC, Australia. younghunk@student.unimelb.edu.au.

Scientific reports
|February 26, 2026
PubMed
まとめ

本研究は、IBM量子プロセッサ上のサーフェスコードを用いた耐障害性量子計算のための高忠実度マジック状態準備を実証する。これは、普遍的な量子コンピュータに不可欠な非クリフォード論理ゲートの実現を前進させるものである。

キーワード:
マジック状態注入サーフェスコード耐障害性量子計算非クリフォードゲート量子誤り訂正IBM量子プロセッサ

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科学分野:

  • 量子コンピューティング
  • 耐障害性量子計算
  • 量子誤り訂正

背景:

  • サーフェスコードは、耐障害性量子計算の主要なアプローチです。
  • 普遍的な耐障害性には、実験的な課題をもたらす非クリフォード操作とマジック状態が必要です。
  • 接続性の制約があるハードウェアへのサーフェスコードの効率的な埋め込みは困難です。

研究 の 目的:

  • 非クリフォードゲートの実装とサーフェスコードの埋め込みにおける課題に対処すること。
  • IBM量子プロセッサ上での高忠実度マジック状態準備を実証すること。
  • サーフェスコードのエラー閾値を改善すること。

主な方法:

  • IBM量子プロセッサ（ibm_fez）用の、量子ビット効率の高い回転ヘビーヘキサゴナルサーフェスコードを利用しました。
  • 非クリフォード操作のためのマジック状態注入プロトコルを実装しました。
  • 論理マジック状態を準備するために、事後選択を使用しました。

主要な成果:

  • 従来の埋め込みと比較して、論理ビット反転エラー（[数式：テキスト参照]）および位相反転エラー（[数式：テキスト参照]）のより高いエラー閾値を達成しました。
  • マジック状態蒸留閾値を超える忠実度（[数式：テキスト参照]および[数式：テキスト参照]）で論理マジック状態（[数式：テキスト参照]および[数式：テキスト参照]）を準備しました。
  • 注入された任意の単一論理量子ビット状態に対して、[数式：テキスト参照]の最小忠実度を報告しました。

結論:

  • 高忠実度のマジック状態準備を通じて、非クリフォード論理ゲートを実現する可能性を示しました。
  • 開発された方法は、現在の量子ハードウェア上での耐障害性量子コンピューティングの進歩に有望です。
  • この発見は、普遍的な量子コンピュータの構築における主要な障害を克服することに貢献します。