振動器のグリッド状態で暗号化された量子ビットの量子エラー修正
P Campagne-Ibarcq1, A Eickbusch2, S Touzard3
1Department of Applied Physics, Yale University, New Haven, CT, USA. philippe.campagne-ibarcq@inria.fr.
Nature
|August 21, 2020
まとめ
研究者は,Gottsman-Kitaev-Preskill (GKP) 状態を使用して,エンコードされた量子ビットに対する量子エラー修正 (QEC) を実証している. この突破は全ての論理的エラーを排除し 容認性量子計算の道を開きます
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:
- 量子コンピュータは量子ビットの論理操作に 高い精度が必要です
- 量子エラー補正 (QEC) は騒音の軽減と論理エラーの防止に不可欠です.
- Gottesman-Kitaev-Preskill (GKP) コードは,量子ビットを非ローカルにエンコードするためのハードウェア効率的な方法を提供します.
研究 の 目的:
- GKPのコード状態を使用してQECを実験的に実装する.
- 暗号化された量子ビットの 論理エラーの抑制を証明するために
- 量子コンピューティングと互換性のあるプロトコルの開発
主な方法:
- フィードバックプロトコルを使用して四角形および六角形GKPコード状態の作成.
- 超伝導マイクロ波孔を振動器として使用して非破壊的な測定を行う.
- 暗号化された量子ビットでQECの実証実験.
主要な成果:
- GKPコードの準備が成功しました.
- 論理エラーを完全に排除したQECの実証
- 実験結果と理論的予測の量的な一致性
結論:
- 開発されたプロトコルは,エンコードされた量子ビットに対して効果的なQECを可能にします.
- この方法は,さまざまなノイズ処理を緩和し,故障耐性量子計算を進める.
- このプロトコルは他の連続変数量子システムにも適用できる.
関連する概念動画
02:45The Quantum-Mechanical Model of an Atom
55.8K
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.
55.8K
01:30Oscillations In An LC Circuit
2.9K
An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
2.9K
00:59Propagation of Uncertainty from Random Error
1.5K
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...
1.5K
02:43Quantum Numbers
48.2K
It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
48.2K
01:10Propagation of Uncertainty from Systematic Error
1.2K
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...
1.2K
01:04Oscillations about an Equilibrium Position
6.4K
Stability is an important concept in oscillation. If an equilibrium point is stable, a slight disturbance of an object that is initially at the stable equilibrium point will cause the object to oscillate around that point. For an unstable equilibrium point, if the object is disturbed slightly, it will not return to the equilibrium point. There are three conditions for equilibrium points—stable, unstable, and half-stable. A half-stable equilibrium point is also unstable, but is named so...
6.4K