Quan­tum tech to link Ji­nan gov­ern­ments

China Daily (Hong Kong) - - CHINA - By ZHANG ZHIHAO zhangzhi­hao@chi­nadaily.com.cn

Ji­nan, Shan­dong prov­ince, will be­come the first city in the world, by the end of Au­gust, to use ul­tra­se­cure quan­tum com­mu­ni­ca­tion in gov­ern­ment, sci­en­tists said on Sun­day.

The net­work, which cost 120 mil­lion yuan ($19.5 mil­lion), will con­nect Party and gov­ern­ment of­fices in the Shan­dong pro­vin­cial cap­i­tal, which has a pop­u­la­tion of 7 mil­lion.

The sys­tem has passed more than 50 rounds of tests since May and is ca­pa­ble of en­crypt­ing more than 4,000 pieces of data ev­ery sec­ond and trans­mit­ting in­for­ma­tion to 200 ter­mi­nals in the city.

The net­work has ex­changed data more than 51,000 times since its launch in Novem­ber 2013 — in­clud­ing se­cure tele­phone calls, faxes and files — with a suc­cess rate of more than 99 per­cent, Liu Hong, a pro­fes­sor at Shan­dong Uni­ver­sity who was in­volved in the test­ing, told Xin­hua News Agency. The re­sults are sat­is­fac­tory, Liu said.

“This is a mile­stone for quan­tum com­mu­ni­ca­tion in China and the world,” said Zhou Fei, as­sis­tant to the di­rec­tor of the Ji­nan In­sti­tute of Quan­tum Tech­nol­ogy. The first users of this tech­nol­ogy will be gov­ern­ment agen­cies, the mil­i­tary, fi­nance and elec­tric­ity sec­tors and fields that re­quire se­cure com­mu­ni­ca­tion, he said.

Ji­nan hosts the world’s largest and most ver­sa­tile metropoli­tan area net­work for re­search­ing and test­ing quan­tum com­mu­ni­ca­tion on a city­wide scale. It could serve as a plat­form for de­vel­op­ing ser­vices and stan­dards on a na­tional or even in­ter­na­tional level, Zhou said.

Quan­tum com­mu­ni­ca­tion is re­garded as the most se­cure be­cause its en­cryp­tion is based on quan­tum en­tan­gle­ment, in which two or more sub­atomic par­ti­cles af­fect each other si­mul­ta­ne­ously, re­gard­less of the dis­tance be­tween them, said Wang Jianyu, a quan­tum re­searcher at the Chi­nese Academy of Sci­ences.

At the same time, the par­ti­cles can­not be de­stroyed or du­pli­cated. Any eaves­drop­per will dis­rupt the en­tan­gle­ment and alert the au­thor­i­ties, he said.

Last year, China launched the world’s first quan­tum satel­lite, Mi­cius, which is tasked with test­ing quan­tum com­mu­ni­ca­tion by trans­mit­ting in­for­ma­tion through pho­tons — in­di­vid­ual units of light — from space.

China also fin­ished build­ing a 2,000-kilo­me­ter land-based quan­tum link be­tween Bei­jing and Shang­hai last year. The link is the long­est in the world and runs through Ji­nan and He­fei, An­hui prov­ince.

Xin­hua con­trib­uted to this story.

Newspapers in English

Newspapers from China

© PressReader. All rights reserved.