我國(guó)科學(xué)家近日設(shè)計(jì)出一種相位量子態(tài)與時(shí)間戳量子態(tài)混合編碼的量子直接通信新系統(tǒng)，成功實(shí)現(xiàn)100公里的量子直接通信。

Chinese scientists have realized the world's longest quantum secure direct communication (QSDC), measuring 100 km, according to the Beijing Academy of Quantum Information Sciences.

據(jù)北京量子信息科學(xué)研究院消息，我國(guó)科學(xué)家成功實(shí)現(xiàn)100公里的量子直接通信。這是至今為止世界上最長(zhǎng)的量子直接通信距離。

The study, jointly conducted by a team of scientists from Tsinghua University and the Beijing Academy of Quantum Information Sciences, was published in early April in the journal Light: Science & Applications.

這項(xiàng)研究由北京量子信息科學(xué)研究院和清華大學(xué)研究團(tuán)隊(duì)共同完成，相關(guān)成果已于4月初發(fā)表在《光：科學(xué)與應(yīng)用》期刊。

"QSDC has attracted much attention, and has become one of the strongest candidates for secure communication in the future," said the paper's introduction.

闡述該研究成果的論文介紹，量子安全直接通信已引起了廣泛關(guān)注，并已成為未來(lái)安全通信最有力的候選之一。

"QSDC securely and reliably transmits information through a quantum channel with both noise and eavesdropping. Compared to classical communication where reliable transmission of information over a noisy channel is concerned, QSDC has the additional capability to ensure its security using the properties of quantum information carriers," the authors wrote.

論文作者寫道，量子直接通信以量子態(tài)作為載體來(lái)編碼和傳輸信息。量子直接通信改變了傳統(tǒng)保密通信的雙信道結(jié)構(gòu)，將噪聲信道下的可靠通信發(fā)展為噪聲和竊聽信道下的可靠和安全通信。

這一突破（breakthrough）能夠?qū)崿F(xiàn)無(wú)中繼條件下（without relays）部分城市與城市之間的點(diǎn)對(duì)點(diǎn)量子直接通信（point-to-point quantum direct communication between cities）。

Before this breakthrough, the longest QSDC distance published was 18 km.

此前公開發(fā)表的成果中，量子直接通信的最長(zhǎng)距離為18公里。

China has been advancing the industrial application of quantum technology. It has achieved a series of breakthroughs in quantum technology in recent years, including the world's first quantum satellite, a 2,000-km quantum communication line between Beijing and Shanghai, and the world's first optical quantum computing machine prototype.

我國(guó)一直在推進(jìn)量子技術(shù)的工業(yè)應(yīng)用。近年來(lái)，我國(guó)在量子技術(shù)方面取得了一系列突破，包括世界上首顆量子科學(xué)實(shí)驗(yàn)衛(wèi)星、長(zhǎng)達(dá)2000公里的量子通信線路“京滬干線”，以及世界上第一臺(tái)光學(xué)量子計(jì)算機(jī)原型機(jī)。

【相關(guān)詞匯】

量子 quantum

竊聽 eavesdrop

參考來(lái)源：新華社、CGTN
編輯：Kirsten