Citat:
Det är faktiskt just pga Dig, och såna som du, som Väst har hamnat så långt på efterkälken när det gäller praktiskt tillämpad kvantforskning.
Under tiden som västerländska fanatiker vägrar att befatta sig med praktisk kkvantforskning (för att ni Tror att det inte går) så har Kina sprungit om väst.
Här kan du läsa om de senaste framstegen:
http://en.ustc.edu.cn/news/201801/t20180119_290740.html
Under tiden som västerländska fanatiker vägrar att befatta sig med praktisk kkvantforskning (för att ni Tror att det inte går) så har Kina sprungit om väst.
Här kan du läsa om de senaste framstegen:
http://en.ustc.edu.cn/news/201801/t20180119_290740.html
Föga förvånande fortsätter du att göra bort dig genom att inte ens försöka förstå vad WbZV skrev i sitt inlägg. Du förstår ju inte ens informationen du själv länkar till...
Experimentet handlar inte om teleportering al'a Star-trek som du fått för dig. En uppfattning som du slår dig blodig för att försvara trots att det är totalt fel.
Citat:
QUESS is a proof-of-concept mission designed to facilitate quantum optics experiments over long distances to allow the development of quantum encryption and quantum teleportation technology.[7] Quantum encryption uses the principle of entanglement to facilitate communication that is totally safe against eavesdropping, let alone decryption, by a third party. By producing pairs of entangled photons, QUESS will allow ground stations separated by many thousands of kilometres to establish secure quantum channels.[3] QUESS itself has limited communication capabilities: it needs line-of-sight, and can only operate when not in sunlight.
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The initial experiment demonstrated quantum key distribution (QKD) between Xinjiang Astronomical Observatory near Ürümqi and Xinglong Observatory near Beijing – a great-circle distance of approximately 2,500 kilometres (1,600 mi).[3] In addition, QUESS tested Bell's inequality at a distance of 1,200 km (750 mi) – further than any experiment to date – and teleported a photon state between Shiquanhe Observatory in Ali, Tibet Autonomous Region, and the satellite.[3] This requires very accurate orbital maneuvering and satellite tracking so the base stations can keep line-of-sight with the craft.
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The main instrument on board QUESS is a "Sagnac effect" interferometer.[3] This is a device which generates pairs of entangled photons, allowing one of each to be transmitted to the ground. This will allow QUESS to perform Quantum key distribution (QKD) – the transmission of a secure cryptographic key that can be used to encrypt and decrypt messages – to two ground stations. QKD theoretically offers truly secure communication. In QKD, two parties who want to communicate share a random secret key transmitted using pairs of entangled photons sent with random polarization, with each party receiving one half of the pair. This secret key can then be used as a one-time pad, allowing the two parties to communicate securely through normal channels. Any attempt to eavesdrop on the key will disturb the entangled state in a detectable way.[9] QKD has been attempted on Earth, both with direct line-of-sight between two observatories, and using fibre optic cables to transmit the photons. However, fibre optics and the atmosphere both cause scattering which destroys the entangled state, and this limits the distance over which QKD can be carried out. Sending the keys from an orbiting satellite results in less scattering, which allows QKD to be performed over much greater distances.
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The initial experiment demonstrated quantum key distribution (QKD) between Xinjiang Astronomical Observatory near Ürümqi and Xinglong Observatory near Beijing – a great-circle distance of approximately 2,500 kilometres (1,600 mi).[3] In addition, QUESS tested Bell's inequality at a distance of 1,200 km (750 mi) – further than any experiment to date – and teleported a photon state between Shiquanhe Observatory in Ali, Tibet Autonomous Region, and the satellite.[3] This requires very accurate orbital maneuvering and satellite tracking so the base stations can keep line-of-sight with the craft.
---
The main instrument on board QUESS is a "Sagnac effect" interferometer.[3] This is a device which generates pairs of entangled photons, allowing one of each to be transmitted to the ground. This will allow QUESS to perform Quantum key distribution (QKD) – the transmission of a secure cryptographic key that can be used to encrypt and decrypt messages – to two ground stations. QKD theoretically offers truly secure communication. In QKD, two parties who want to communicate share a random secret key transmitted using pairs of entangled photons sent with random polarization, with each party receiving one half of the pair. This secret key can then be used as a one-time pad, allowing the two parties to communicate securely through normal channels. Any attempt to eavesdrop on the key will disturb the entangled state in a detectable way.[9] QKD has been attempted on Earth, both with direct line-of-sight between two observatories, and using fibre optic cables to transmit the photons. However, fibre optics and the atmosphere both cause scattering which destroys the entangled state, and this limits the distance over which QKD can be carried out. Sending the keys from an orbiting satellite results in less scattering, which allows QKD to be performed over much greater distances.
https://en.wikipedia.org/wiki/Quantu...at_Space_Scale
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Senast redigerad av LaurentiusLucidor 2018-02-19 kl. 10:59.
Senast redigerad av LaurentiusLucidor 2018-02-19 kl. 10:59.
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