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関連する概念動画

Escape Velocity01:26

Escape Velocity

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The escape velocity of an object is defined as the minimum initial velocity that it requires to escape the surface of another object to which it is gravitationally bound and never to return. For example, what would be the minimum velocity at which a satellite should be launched from the Earth's surface such that it just escapes the Earth's gravitational field?
To calculate the escape velocity, it is assumed that no energy is lost to any frictional forces. In practice, a satellite...
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Circular Orbits and Critical Velocity for Satellites01:16

Circular Orbits and Critical Velocity for Satellites

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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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Introduction to Global Positioning System01:30

Introduction to Global Positioning System

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The Global Positioning System (GPS) revolutionized positioning on Earth, providing precise location data through satellite ranging. The GPS system was developed in 1978 by the U.S. Department of Defense  for military use, and it became available for civilian applications in 1983, transforming fields including navigation, fleet management, and time synchronization for telecommunications systems.GPS consists of satellites in medium Earth orbit, about 20,200 kilometers above the surface,...
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Energy of a Satellite in a Circular Orbit01:11

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Thousands of artificial satellites orbit the Earth every day at various distances from the Earth. Satellites that orbit the Earth below an altitude of 1,600 km are considered to be orbiting in low-Earth orbit (LEO). Research satellites and Earth observation satellites are usually placed in LEO, and mostly orbit the Earth in elliptical orbits. Navigation satellites are placed in medium-Earth orbit (MEO), ranging from 2,000 km to 36,000 km from the surface of the Earth. Meanwhile, communication...
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Errors in Global Positioning System01:26

Errors in Global Positioning System

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Global Positioning System (GPS) technology has revolutionized navigation and positioning, but its accuracy is often compromised by various errors. These errors, stemming from environmental, satellite, and receiver-related factors, require careful mitigation to ensure reliable performance across applications.Atmospheric ErrorsGPS signals travel through the Earth’s ionosphere and troposphere, introducing delays which affect accuracy. The ionosphere is strongly influenced by charged particles,...
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Trigonometric Substitution01:23

Trigonometric Substitution

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Trigonometric substitution is a technique used to simplify integrals that contain square root expressions involving quadratic forms. It is particularly effective when the integrand includes terms resembling those found in standard geometric equations, such as circles or ellipses.Molniya satellites follow highly elliptical orbits, repeatedly sweeping out the same regions of space as they revolve around Earth. To estimate the area enclosed by such an orbit, the path is modeled as an ellipse...
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地上から衛星への量子テレポート

Ji-Gang Ren1,2, Ping Xu1,2, Hai-Lin Yong1,2

  • 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

地球から衛星への量子テレポーテーションは 地球規模の量子インターネットの重要なステップです この画期的な発見は 信頼性の高い量子状態の 移動の先の制限を克服しました

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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:

  • 量子テレポーテーションは 量子状態の安全な転送を可能にします 量子ネットワークにとって不可欠です
  • これまでの実験は 光ファイバーと地上空のチャンネルでの光子損失により ~100kmに制限されていました
  • 量子テレポーテーションの範囲を拡大することは グローバルな量子インターネットに不可欠です

研究 の 目的:

  • 衛星接続で 遥か遠くまで 量子テレポーテーションを証明する
  • 地上量子通信の 限界を乗り越えるために
  • 世界規模の量子インターネットの基盤を確立する

主な方法:

  • 効率的なアップリンク送信のためにコンパクトで超明快な絡み合った光子の源を使用しました.
  • 狭いビームの分散と高精度な指針,取得,追跡システムを採用した.
  • 地上観測所から 低地球軌道衛星への 量子テレポーテーションを 1400キロ以上行いました

主要な成果:

  • 単光子量子ビットの量子テレポーテーションを 1400kmまでの距離で成功させました
  • テレポートされた量子状態の高精度 (0.80 ± 0.01) が実証され,古典的な限界を超えています.
  • 地上から衛星への 信頼性の高い 量子通信の課題を克服した

結論:

  • このデモは 超長距離量子テレポーテーションの 重要な進歩です
  • 地上から衛星へのアップリンクは,将来のグローバルな量子インターネットの鍵となる技術です.
  • 世界規模で分散型量子コンピューティングと 安全な量子通信ネットワークの 基礎を築きます