日韩精品久久一区二区三区_亚洲色图p_亚洲综合在线最大成人_国产中出在线观看_日韩免费_亚洲综合在线一区

Global EditionASIA 中文雙語Fran?ais
Europe

Chinese science takes lead in quantum race

By Zhang Zhihao | China Daily Europe | Updated: 2017-08-11 09:36
Share
Share - WeChat

China has become the first country to send quantum keys - highly complex encryptions - from a satellite to a base on Earth, and to teleport light particles the other way.

The accomplishments are two major breakthroughs in the effort to create an unhackable global communications network.

The two experiments mark the completion of the the second and third of the three main goals of Micius, the world's first quantum communications satellite, which China launched last year.

The first goal, to send entangled light particles farther than ever before, was achieved in June. Entanglement is a phenomenon in which two or more particles can affect each other simultaneously regardless of distance. Entangled particles cannot be described independently of each other.

Bai Chunli, president of the Chinese Academy of Sciences, says China is now the world leader in quantum communication technologies and is working with scientists from Austria, Germany and Italy. He said Micius will continue to perform experiments until its expected service life expires next year.

"The trio of quantum experiments will be central to any global space-based quantum internet," Karl Ziemelis, chief physical science editor at Nature magazine, says in a video interview. The magazine published two articles about China's breakthroughs on Aug 10.

"They are testaments to China's investment and significant effort in physical sciences ... and pushed research in practical quantum communication technology to such astronomical heights."

All private data, from bank accounts to social media pictures, are protected by "keys", which are extremely complex mathematical codes transmitted between users and companies. However, these codes can be exploited if a hacker "eavesdrops" on these keys during transmission.

Quantum keys use quantum physics rather than math to encrypt data, making them impossible to hack by conventional computers. They also have the ability to alert authorities when someone tries to eavesdrop, says Pan Jianwei, an academician with the Chinese Academy of Sciences and the chief physicist behind Micius.

"This will have major applications in government, military, finance, energy and other fields where security is paramount," he adds.

However, distributing quantum keys is difficult because sending them over long distances via fiber optics or during daytime results in massive signal loss or disturbance.

In the latest quantum key experiment, Micius beamed photons - individual particles of light - and created an optical link with the observatory station in Xinglong, Hebei province. When the link was at 1,200 kilometers, scientists discovered that quantum key distribution efficiency between the two improved 100 quintillion times (1 followed by 20 zeros) compared with fiber optics of the same length.

Micius produced and transmitted about 300,000 bits of quantum keys during the experiment. One practical use for these keys is to create advanced encryptions that are impossible for computers to hack with "brute force", a method in which a computer guesses all possible combinations of a pass code.

"Combine all the computing power of the world, which is around two to the power of 80 to 100, it will still take years for it to guess the correct combination," Pan says.

The second experiment is about one of the biggest mysteries of quantum mechanics, known as quantum teleportation, Ziemelis says. In the experiment, Chinese scientists "spookily" transferred a photon on Earth to Micius in space, without needing the object itself to move.

Pan says, "Its effect is like the Star Trek teleporter." It works by deconstructing a photon on Earth, then sending its extracted quantum information to Micius' receivers via entangled link. Then an entangled photon in space downloads the information and takes on the complete identity of the original.

[email protected]

(China Daily European Weekly 08/11/2017 page14)

Today's Top News

Editor's picks

Most Viewed

Top
BACK TO THE TOP
English
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
主站蜘蛛池模板: 精品一区二区三区四区五区六区 | 欧美自拍视频 | 午夜一级毛片 | 中国一级免费视频 | 亚洲欧洲视频在线观看 | 亚洲国产欧洲综合997久久 | 欧美成人a级在线视频 | 日本成人一区二区三区 | 久久国产视频网 | 亚洲欧美在线免费观看 | 色婷婷天天综合在线 | 96精品专区国产在线观看高清 | 久久亚洲在线 | 久久免费看少妇高潮A片JA | 浮力影院最新地址 | 精品免费国产一区二区三区 | 日日摸夜夜添免费毛片小说 | 欧美一级片 | 亚洲综合无码一区二区 | 毛片a级毛片免费播放100 | 国产精品一区久久久久 | 亚洲欧美日韩精品久久奇米色影视 | 亚洲高清免费观看 | 久久久久久一区 | 国产成人精品一区二区三区四区 | 久久综合一个色综合网 | 国产网站在线播放 | 欧美亚洲另类在线 | 精品国产乱码久久久久久88av | 久久大香香蕉国产免费网站 | 国产睡熟迷奷系列网站 | 色爱综合区五月小说 | 91网址在线 | 亚洲视频免费在线看 | 欧美综合国产 | 色呦呦在线| 日日操天天操夜夜操 | 色偷偷亚洲男人 | 欧美精品亚洲一区二区在线播放 | 午夜欧美一区二区三区在线播放 | 天天干天日 |