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  • 中科學家率先實現全光量子中繼

    發布時間: 2019/7/5 0:26:17 被閱覽數: 次 來源: 科技日報
    文字 〖 〗 )
    科技日報訊 (記者吳長鋒)記者從中國科學技術大學獲悉,該校潘建偉院士及其同事陳宇翱、徐飛虎等,在國際上首次實驗實現全光量子中繼器的原理性驗證,為構建遠距離光纖量子網絡開辟了新途徑。該成果于日前在線發表于《自然·光子學》上。  

      遠距離量子通信過程中,信道傳遞的量子態往往隨著通信距離的增加而指數減少,極大地限制了量子通信的有效傳輸距離。目前主要有兩種解決方案:其一是在幾乎真空,量子信號損耗極小的外太空,利用衛星擴展量子通信距離,“墨子號”量子科學實驗衛星成功驗證了這一方案的可行性。其二是在光纖網絡中使用量子中繼器,將一段長距離光纖信道分割成多段距離比較短的信道,使得量子信號不再隨距離的增加而指數衰減,從而擴展量子通信距離。  

      鑒于量子中繼器的重要科學和應用價值,國際上關于量子中繼器研究的競爭非常激烈。然而,目前的量子存儲性能有限,實現實用化量子中繼器還需假以時日。  

      研究團隊首先對原始的全光量子中繼方案進行改進,使用了光子GHZ態和后選擇貝爾測量來實現不同信道間光子對的任意連接,從而有效地提升量子信道中糾纏態的分發成功概率。然后,再利用6個獨立的參量下轉換雙光子糾纏源,在實驗上成功地搭建了一個基于12光子的全光量子中繼器,測試了該量子中繼器的各方面性能,并在實驗上驗證了其相比于糾纏交換方案的優勢。實驗結果顯示,全光量子中繼器可以有效提升量子態的傳輸速率,從而拓展量子通信的傳輸距離。  

      該成果成功驗證了全光量子中繼器的可行性,在原理上使得量子存儲器不再是搭建量子中繼器的必要條件,為實用化量子中繼器的研究開辟了新途徑。
    編輯:秋痕

    人馬座星流 有了第一張3D畫像
    《科學美國人》評出2019年十大突破性技術

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