本文關(guān)鍵詞：基于高斯調(diào)制的連續(xù)變量量子通信的研究　出處：《天津工業(yè)大學》2017年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 連續(xù)變量 量子密鑰分配 協(xié)方差矩陣 密鑰產(chǎn)生率

【摘要】：量子通信理論是量子信息學的核心內(nèi)容之一。它的出現(xiàn)為信息的安全傳輸開辟了一種全新的思路,為密碼科學和通信科學帶來了新的活力。自BB84協(xié)議被提出以來,無論是離散變量還是連續(xù)變量的量子通信,在理論和實驗上都取得了許多的重要的研究成果。同時這些成果顯示出了量子通信的巨大的應(yīng)用前景和商業(yè)價值,吸引了世界各國政府投入了大量人力資源進行進一步的研究。雖然連續(xù)變量量子通信技術(shù)相比于離散變量量子通信技術(shù)來說出現(xiàn)較晚,但它卻具有很明顯的后發(fā)優(yōu)勢。其利用經(jīng)典光源,如用相干光作為信號源,具有實現(xiàn)成本低,并且容易集成等優(yōu)點。本文詳細闡述了高斯調(diào)制的連續(xù)變量量子通信過程,對其中的安全密鑰產(chǎn)生率進行了詳細的研究,并對該通信方案下的安全性進行了深入的分析和討論。主要研究內(nèi)容有以下兩個方面:(1)闡述了對稱配置下的連續(xù)變量量子通信過程的方案相比較一般的通信方案具有一定的優(yōu)勢�；跍y量設(shè)備無關(guān)來提高Alice和Bob之間的互信息量。隨后,利用相關(guān)的測量理論和量子信息論得出基于糾纏表象下的理論安全密鑰產(chǎn)生率。同時結(jié)合量子態(tài)的協(xié)方差矩陣的表征方法,詳細說明了通信雙方以及竊聽者經(jīng)過測量前后所得到的條件協(xié)方差矩陣的推導過程。并利用矩陣的辛本征值與Von Neumann熵的關(guān)系最終計算得出連續(xù)變量量子安全密鑰產(chǎn)生率的理論表達式。(2)針對對稱配置下的連續(xù)變量量子通信系統(tǒng)進行了安全性分析。根據(jù)關(guān)聯(lián)參數(shù)與物理環(huán)境之間的關(guān)系對攻擊類型進行適當?shù)胤诸?通過數(shù)值模擬的方法得出最佳的攻擊方法,并給出最佳攻擊方法下的安全密鑰產(chǎn)生率。然后,對安全密鑰產(chǎn)生率的進行了深入地分析,將探測器的探測效率考慮進來,用兩個分束器來對探測器的效率進行模擬。最終得出在對稱配置的條件下,探測器的效率不為1條件下的雙模高斯攻擊下的安全密鑰產(chǎn)生率。
[Abstract]:The theory of quantum communication is one of the core content of quantum information science. It appears safe transmission of information opens up a new method, has brought new vitality to the password science and communication science. Since the BB84 protocol is presented, both discrete variables or continuous variable quantum communication, the important research results many have been made in theory and experiment. At the same time, these results show that the quantum communication has great application prospect and commercial value, attracted the attention of governments around the world have invested a lot of human resources for further research. Although the continuous variable quantum communication technology compared to the discrete variable quantum communication technology appeared relatively late, but it has the obvious advantage of backwardness. The classical sources, such as the use of coherent light as the signal source, has low cost and easy integration, etc. This paper expounds high Continuous variable quantum communication, modulation rate, have carried out a detailed study of the security key, and security of the communication scheme are analyzed and discussed in detail. The main research contents include the following two aspects: (1) describes the configuration of the symmetric communication scheme of continuous variable quantum communication the scheme is more general has certain advantages. Based on independent measurement equipment to improve the mutual information between Alice and Bob. Then, using the measurement theory and related theory of quantum information is obtained under the representation theory of the rate of safety entanglement key. Based on the characterization method combined with the covariance matrix of quantum states, a detailed description of the derivation of the conditional covariance matrix obtained by both sides of communication and the eavesdropper through measurement before and after. And by using the symplectic eigen matrix relation between Von value and Neumann entropy calculated the end. Continuous variable quantum secure key generation theory expression rate. (2) for continuous variable quantum communication system under the symmetric configuration was analyzed. Proper classification of attack types according to the relationship between the related parameters and the physical environment, the best attack method is obtained through numerical simulation method, and gives the best security key attack the method of generating rate. Then, the secure key generation rate is analyzed, the detection efficiency of the detector into account, using two beam splitter to the efficiency of the detector is simulated. Finally the symmetrical configuration under the condition that the detector efficiency for security key Gauss 1 attack mode under the production rate.

【學位授予單位】：天津工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O413;TN918

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本文編號：1398256