無条件の量子テレポーテーション
Furusawa1, Sorensen, Braunstein
1A. Furusawa, C. A. Fuchs, and H. J. Kimble are in the Norman Bridge Laboratory of Physics, California Institute of Technology, Pasadena, CA 91125, USA. J. L. Sorensen and E. S. Polzik are at the Institute of Physics and Astronomy, Aarhus University, A.
Science (New York, N.Y.)
|October 23, 1998
まとめ
この研究は,圧縮状態の絡み合いを用いて,光学的に一貫した状態の無条件の量子テレポーテーションを実証しています. 実験結果は,そのプロセスの量子的性質を,古典的な限界を超えた忠実さで確認した.
科学分野:
- 量子物理学とは,量子物理学のことです.
- 量子光学とは,量子光学である.
- 量子情報科学とは,量子情報科学である.
背景:
- 量子テレポーテーションは,量子状態の移転を可能にします.
- 絡み合いは,高精度量子テレポーテーションを達成するために不可欠です.
- 以前のテレポーテーションプロトコルは,多くの場合,無条件の状態移転が欠けていました.
研究 の 目的:
- 光学的に一貫した状態の無条件の量子テレポーテーションを実験的に実証する.
- テレポーテーションプロセスの量子的性質を検証するために.
- テレポーテーションの信頼性を高めるために,圧縮状態の絡み合いを利用する.
主な方法:
- 量子テレポーテーションの実験的実施.
- 資源として圧縮状態の絡み合いを利用する.
- 入力と出力量子状態の間の忠誠度を測定する.
主要な成果:
- 光学的に一貫した状態のための量子テレポーテーションの実験的実証が成功しました.
- 0.58 +/- 0.02.の実験的精度 (Fexp) を達成しました.
- すべての入力状態がテレポートされ,無条件のテレポーテーションが実証されました.
結論:
- この実験は,テレポーテーションにおける量子優位性を確認し,0.5フィデリティという古典的な限界を超えた.
- 圧縮状態の絡み合いは,高精度量子テレポーテーションのための効果的なリソースです.
- この研究は,無条件の量子テレポーテーションの最初の実現を表しています.
関連する概念動画
04:08The Uncertainty Principle
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 mathematically...
02:45The 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...
02:43Quantum Numbers
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.
01:14Zeroth Law of Thermodynamics
Experimentally, if object A is in equilibrium with object B, and object B is in equilibrium with object C, then object A is in equilibrium with object C. That statement of transitivity is called the "zeroth law of thermodynamics." For example, a cold metal block and a hot metal block are both placed on a metal plate at room temperature. Eventually, the cold block and the plate will be in thermal equilibrium. In addition, the hot block and the plate will be in thermal equilibrium. By the zeroth...
00:59Propagation of Uncertainty from Random Error
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...
01:10Propagation of Uncertainty from Systematic Error
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 particular...