固体量子ビットにおけるベリーの相の観測
1Department of Physics, Eidgenössische Technische Hochschule (ETH) Zürich, Schafmattstrasse 16, 8093 Zürich, Switzerland. leek@phys.ethz.ch
Science (New York, N.Y.)
|November 24, 2007
まとめ
研究者は制御された幾何相,またはベリー・フェーズを使用した.
科学分野:
- 量子情報科学とは,量子情報科学である.
- 超伝導クビット
- 量子コンピューティング
背景:
- 量子波関数の相は,量子情報科学における情報のエンコーディングに極めて重要です.
- 現在の方法は,主に相操作のためのダイナミック効果を使用していますが,幾何相は潜在的な故障耐性を提供しています.
- 幾何相の一種であるベリーの相は,量子力学の重要な概念である.
研究 の 目的:
- 超伝導量子ビットにおける幾何相 (ベリー相) の制御された蓄積を実証する.
- ジオメトリックフェーズを用いた量子情報操作の代替方法を探求する.
- 量子システムにおける幾何学的相の潜在的故障耐性の利点を調査する.
主な方法:
- 超伝導量子ビットを量子システムとして利用した.
- 量子ビットを幾何学的に操作するためにマイクロ波放射線を使用した.
- 集積された幾何学的相を観察するために干渉実験を行った.
主要な成果:
- 超伝導量子ビットにおけるベリー相の制御された蓄積を成功裏に実証した.
- 実験結果とベリー相の理論的予測の間の優れた一致を観察した.
- 量子ビットの安定性に影響を及ぼすフェーシングへの幾何学に依存する貢献を特定しました.
結論:
- 制御された幾何学的相積は,超伝導量子ビットで達成可能である.
- 幾何学的な操作は,量子情報処理のダイナミックな方法の実行可能な代替案を提供します.
- 幾何学に依存した脱相化の理解は,故障耐性量子コンピュータの開発に不可欠です.
関連する概念動画
01:21Phase Transitions
A phase transition is the process in which a substance changes from one state of matter to another, like from a solid to a liquid, liquid to gas, or vice versa, at a specific temperature and under given pressure conditions. This change is spontaneous and is affected by alterations in temperature and pressure. These parameters impact the strength of the forces between molecules (intermolecular forces) in the substance.During a phase transition, both the initial and final phases of the substance...
02:31Phase Transitions
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...
01:03Atomic Nuclei: Nuclear Spin State Overview
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
02:32The de Broglie Wavelength
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...
01:19Phase Diagram
The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).
01:24Phase Diagram
A phase diagram is a graphical representation of the physical states of a substance under different conditions of temperature and pressure. It shows the boundaries between solid, liquid, and gas phases and the conditions at which these phases coexist in equilibrium. An area in a phase diagram represents a single phase, whereas lines or phase boundaries represent the equilibrium between two phases.In the phase diagram of water, the boundary line between the solid and liquid states illustrates...