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Quantum Numbers02:43

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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.
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The Moon orbits around the Earth. In turn, the Earth (and other planets) orbit the Sun. The space directly above our atmosphere is filled with artificial satellites in orbit. One can examine the circular orbit, the simplest kind of orbit, to understand the relationship between the speed and the period of planets and satellites with respect to their positions and the bodies that they orbit.
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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.
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Secondary distribution systems provide electrical energy at the utilization voltage levels from distribution transformers to customer meters. Typical secondary voltages in the United States include 120/240 V for residential use, 208Y/120 V for residential and commercial use, and 480Y/277 V for industrial and high-rise commercial use.
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衛星から地への量子鍵の配分

Sheng-Kai Liao1,2, Wen-Qi Cai1,2, Wei-Yue Liu1,2

  • 1Department of Modern Physics and Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China.

Nature
|August 22, 2017
PubMed
まとめ
この要約は機械生成です。

衛星ベースの量子鍵配分 (QKD) は,光ファイバーの距離制限を克服します. この研究で,低地球軌道衛星から地球への高速で安全な量子通信リンクが達成されました.

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科学分野:

  • 量子情報科学
  • 量子コミュニケーション
  • 衛星技術

背景:

  • 量子鍵配分 (QKD) は,量子力学を用いた無条件の通信セキュリティを提供します.
  • 地球上のQKDは 光ファイバーと空間のフォトン損失により 数百キロに制限されています
  • 衛星ベースのQKDは,スペースの低損失と脱合性を活用して,距離の制限を克服するための解決策を提供します.

研究 の 目的:

  • 衛星ベースの量子鍵の配布を実施するための低地球軌道衛星の開発と打ち上げ.
  • 信頼性の高い 効率的な宇宙から地球への 量子通信リンクを確立する
  • 世界規模の量子ネットワークの実現可能性を宇宙ベースのQKDで実証する.

主な方法:

  • 量子通信用の低軌道衛星の開発と打ち上げ
  • フォトン数分割攻撃に対する強固なQKDプロトコルの実装.
  • 量子状態を衛星から地上ステーションに長距離伝送する.

主要な成果:

  • 衛星から地球への量子鍵の配分に キロヘルツのキーレートを達成した
  • 量子状態の伝送は 1,200キロメートルまで成功しました
  • 達成されたキーレートは,同様の長さの光ファイバーで可能であるよりも約20倍の大きさです.

結論:

  • 衛星ベースの誘致状態のQKDは,安全な,長距離量子通信を確立するための実用的な技術です.
  • 開発された宇宙から地への量子リンクは,地上ファイバーベースのシステムの性能を大幅に上回ります.
  • この画期的な発見は 世界規模の量子ネットワークの実現の道を開きます