超科幻：穿越時空超越光速成為現實！軍事意義無可估量

這個真的很震撼哦！

我國科學家在量子通信研究上再次創造世界紀錄:由中國科學技術大學和清華大學組成的聯合小組,成功實現了16公里的量子態隱形傳輸,這一距離是目前世界最遠距離的20多倍。 　　6月1日出版的英國《自然—光子學》雜誌,以封面文章發表了這一成果,並給予高度評價。 　　聯合小組成員彭承志教授6日下午在接受記者電話採訪時說,該實驗首次證實了在自由空間進行遠距離量子態隱形傳輸的可行性,向全球化量子通信網路的最終實現邁出了重要一步。 　　彭承志說,量子是對原子、電子、光子等物質基本單元的統稱。在量子世界中存在一種類似“心電感應”的現象,即通常所說的“量子糾纏”。“打個比方說,甲乙兩人身處兩地,分別拿一個具有糾纏關係的光子,甲對這個光子進行某種操作,它會發生一些變化,這時乙手中的光子也會發生同樣的變化。”彭承志說,量子態隱形傳輸就是指利用量子糾纏技術,借助衛星網路、光纖網路等經典通道,傳輸量子態攜帶的量子資訊。“量子態隱形傳輸很像科幻小說中描繪的‘超時空穿越’:外星人在一個地方神秘地消失,不需要任何載體的攜帶,又在另一個地方神秘地瞬間出現。量子態隱形傳輸是未來量子通信網路的核心要素。與傳統的通信方式相比,它具有絕對安全性和超高通道容量等明顯優勢。” 　　據介紹,量子態隱形傳輸向人類展示了未來通信的美好前景,一直備受國際科學界的關注。1997年,奧地利蔡林格小組在室內首次完成了量子態隱形傳輸的原理性實驗驗證;2004年,該小組利用多瑙河底的光纖通道,成功地將量子態隱形傳輸距離提高到600米。但由於光纖通道中的損耗和環境干擾,量子態隱形傳輸的距離難以大幅度提高。 　　2004年,中國科大潘建偉、彭承志等研究人員開始探索在自由空間實現更遠距離的量子通信。在自由空間,環境對光量子態的干擾效應極小,而光子一旦穿透大氣層進入外太空,其損耗更是接近于零,這使得自由空間通道比光纖通道在遠距離傳輸方面更具優勢。 　　2005年,該小組在合肥創造了13公里的自由空間雙向量子糾纏分發的世界紀錄,同時驗證了在外太空與地球之間分發糾纏光子的可行性。 　　從2007年開始,中國科大—清華大學聯合研究小組在北京八達嶺與河北懷來之間架設了長達16公里的自由空間量子通道,並取得了一系列關鍵技術突破,最終在2009年成功實現了世界上最遠距離的量子態隱形傳輸。這證實了量子態隱形傳輸穿越大氣層的可行性,為未來基於衛星中繼的全球化量子通信網奠定了可靠基礎。 　　據彭承志介紹,今後他們將在此前研究的基礎上,朝兩個方向努力:一是借助空間站、衛星等空間平臺,實現全球通信網路;二是通過光纖網路,實現同城使用者的通信。“根據目前的進展,我們預計今後10年內有望建成覆蓋全球的量子通信網路。”彭承志說。...

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Quantum teleportation achieved over 16 km May 20, 2010 by Lin Edwards a, A birds-eye view of the 16-km free-space quantum teleportation experiment. Charlie sends photon 1 to Alice for BSM. Classical information, including the results of the BSM and the signal for time synchronization, is sent through the free-space channel with photon 2, to Bob, before decoding and triggering of the corresponding unitary transformation. b, Sketch of the experimental system. See the original paper for more details. Image copyright: Nature Photonics, doi:10.1038/nphoton.2010.87 (PhysOrg.com) -- Scientists in China have succeeded in teleporting information between photons further than ever before. They transported quantum information over a free space distance of 16 km (10 miles), much further than the few hundred meters previously achieved, which brings us closer to transmitting information over long distances without the need for a traditional signal. Quantum teleportation is not the same as the teleportation most of us know from science fiction, where an object (or person) in one place is “beamed up” to another place where a perfect copy is replicated. In quantum teleportation two photons or ions (for example) are entangled in such a way that when the quantum state of one is changed the state of the other also changes, as if the two were still connected. This enables quantum information to be teleported if one of the photons/ions is sent some distance away. In previous experiments the photons were confined to fiber channels a few hundred meters long to ensure their state remained unchanged, but in the new experiments pairs of photons were entangled and then the higher-energy photon of the pair was sent through a free space channel 16 km long. The researchers, from the University of Science and Technology of China and Tsinghua University in Beijing, found that even at this distance the photon at the receiving end still responded to changes in state of the photon remaining behind. The average fidelity of the teleportation achieved was 89 percent. The distance of 16 km is greater than the effective aerosphere thickness of 5-10 km, so the group's success could pave the way for experiments between a ground station and a satellite, or two ground stations with a satellite acting as a relay. This means quantum communication applications could be possible on a global scale in the near future. The public free space channel was at ground level and spanned the 16 km distance between Badaling in Beijing (the teleportation site) and the receiver site at Huailai in Hebei province. Entangled photon pairs were generated at the teleportation site using a semiconductor, a blue laser beam, and a crystal of beta-barium borate (BBO). The pairs of photons were entangled in the spatial modes of photon 1 and polarization modes of photon 2. The research team designed two types of telescopes to serve as optical transmitting and receiving antennas. The experiments confirm the feasibility of space-based quantum teleportation, and represent a giant leap forward in the development of quantum communication applications. 國外報導很多： 下載: 訪客無法瀏覽下載點，請先 註冊 或 登入會員 下載: 訪客無法瀏覽下載點，請先 註冊 或 登入會員

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yastern

恩 如果是真的加油吧 科技不分你我

im7099

感謝分享 ...十分受用...

colinchang

相信科化電影,也慢慢呈現於現實生活中.

plokij3000

恩.....
好複雜
有聽沒有懂

pzjager

中國媒體報導有多少真實性可言?如果是事實根本不可能報導吧,是重大的機密.

導引對手發展錯誤方向,進行無謂的資源投入.

didilic

短程應該仍以通訊為主要目標吧
軍事用途似乎仍只是遙遠的想法

感覺還不錯
可是應該也只是小部分的傳輸
以軍事而言
還太早惹