本文選題：量子通信 + 自由空間��； 參考：《中國科學技術大學》2014年博士論文

【摘要】：實現(xiàn)超遠距離量子通信一直是量子信息領域的難點之一。由于光纖固有衰減影響,在光纖信道中量子通信的距離已接近極限,而光子在通過大氣層后的外層空間衰減幾乎為零。于是基于空間平臺中轉的星地量子通信成為實現(xiàn)全球化量子通信最切實可行的方案之一。本文作者在博士階段的主要工作,就是圍繞自由空間量子通信在鏈路建設和時間同步方面的關鍵技術進行研究,并以這些關鍵技術為突破點,完成了遠程雙光子干涉和白天量子密鑰分發(fā)等實驗。在鏈路建設方面,本人研究了窄光束發(fā)射和高精度光束自動跟蹤技術,所研制系統(tǒng)的遠場發(fā)散角達到了 12 μrad,跟蹤誤差小于3 μrad。在97 km光學鏈路中,鏈路總效率達到了 35dB;另外,在52 km光學鏈路(單模)中,鏈路總效率最高達到了 30 dB。在時間同步方面,本人負責了外同步光系統(tǒng),并開發(fā)了一套用于進行遠程時間同步的數(shù)據(jù)處理軟件。在102 km鏈路的實驗中,同步系統(tǒng)精度達到了1 ns,提高了實驗的信噪比;而數(shù)據(jù)處理軟件也應用在了數(shù)個實驗中。在這些技術的基礎上,本人參與了 97 km量子隱形傳態(tài)實驗,負責接收端具體工作,實驗說明了基于衛(wèi)星的超長距離的量子隱形傳態(tài)的可行性。本人還組織完成了 220 m自由空間的雙光子干涉實驗和52 km白天量子密鑰分發(fā)實驗。其中,雙光子干涉實驗是基于糾纏的遠距離量子中繼和量子通信的基礎。白天量子密鑰分發(fā)實驗是將來進行不需可信中繼的量子密鑰分發(fā)實驗的技術積累,可以實現(xiàn)自由空間與光纖通道的無縫連接,也是進行全時段自由空間量子實驗的嘗試。
[Abstract]:It is one of the difficulties in quantum information field to realize quantum communication over long distance. Due to the influence of the intrinsic attenuation of the optical fiber, the distance of quantum communication in the fiber channel is close to the limit, while the photon attenuation in the outer space after passing through the atmosphere is almost zero. Therefore, satellite-ground quantum communication based on space platform transfer becomes one of the most feasible schemes to realize global quantum communication. The author's main work in the Ph.D. phase is to study the key technologies of free space quantum communication in link construction and time synchronization, and take these key technologies as the breakthrough point. Experiments such as remote two-photon interference and daytime quantum key distribution are carried out. In the aspect of link construction, I have studied the technology of narrow beam emission and high precision beam automatic tracking. The far field divergence angle of the developed system is 12 渭 radand the tracking error is less than 3 渭 rad. In the 97 km optical link, the total link efficiency is 35 dB, and in the 52 km optical link (single mode), the maximum link efficiency is 30 dB. In the aspect of time synchronization, I take charge of the external synchronous optical system and develop a set of data processing software for remote time synchronization. In the experiment of 102km link, the precision of synchronization system is up to 1ns, which improves the signal-to-noise ratio (SNR) of the experiment, and the data processing software is also used in several experiments. On the basis of these techniques, I have participated in the 97 km quantum teleportation experiment, which is responsible for the specific work of the receiver. The experiment shows the feasibility of the super-long distance quantum teleportation based on satellite. I have also completed the two-photon interference experiment in 220m free space and the 52km daytime quantum key distribution experiment. The two-photon interference experiment is the basis of quantum relay and quantum communication based on entanglement. The daytime quantum key distribution experiment is a technique accumulation of quantum key distribution experiment without trusted relay in the future. It can realize the seamless connection between free space and fiber channel, and it is also an attempt to carry out free space quantum experiment in full time.
【學位授予單位】：中國科學技術大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：O413;TN918

【參考文獻】

相關期刊論文 前1條

1 任繼剛;印娟;楊彬;周飛;易震環(huán);彭承志;舒嶸;王建宇;;星地量子密鑰分發(fā)中的時間同步研究[J];紅外與毫米波學報;2011年04期

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本文編號：2067033