固体量子ビットが3メートル隔てられている間に,予告された絡み合いがある
1Kavli Institute of Nanoscience Delft, Delft University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands.
Nature
|April 26, 2013
まとめ
研究者は,ダイヤモンドで3メートル隔てられた2つの電子スピン量子ビット間の量子エンタグリングを達成しました. このブレークスルーにより,堅牢な量子ネットワークと長距離量子通信が可能になり,量子情報処理が進んでいます.
科学分野:
- 量子物理学とは,量子物理学のことです.
- 量子情報科学とは,量子情報科学である.
背景:
- 量子エンタグレメントは,空間的に分離した物体を結びつけ,古典的な説明に逆らう.
- 絡み合いは,量子情報処理,通信,暗号化において極めて重要です.
研究 の 目的:
- 空間的に分離した2つの電子スピン量子ビット間の絡み合いを示すために.
- 拡張可能な量子ネットワークと長距離量子通信のための基盤を確立する.
主な方法:
- 各量子ビットの位置でスピンフォトン絡みを作り出すプロトコルを利用しました.
- 量子ビットの絡み合いを宣言するために,光子に関する共同測定を行った.
- シングルショット量子ビットの読み取りによる非ローカル量子相関の検証.
主要な成果:
- 3メートルの空間的な分離で2つの電子スピン量子ビットの絡み合いを達成しました.
- スピンフォトンインターフェースを使用して,堅牢なエンタグメント生成が実証されました.
- 絡み合った状態を確認した非局所量子相関が確認されました.
結論:
- この長距離の絡み合いは,量子リピーターと決定的長距離テレポーテーションに向けた重要なステップです.
- 局所的な核スピンレジスタとの統合により,高度な量子ネットワークの機能が可能になります.
- この発見は,拡張量子ネットワークと安全な遠距離量子通信の道を開く.
関連する概念動画
01:24Metal-Semiconductor Junctions
1.3K
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
1.3K
02:45The Quantum-Mechanical Model of an Atom
61.6K
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.
61.6K
02:18Network Covalent Solids
16.5K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
16.5K
01:20Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
1.9K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.9K