【摘要】：量子通信是量子信息學(xué)的核心內(nèi)容之一,它為信息的安全傳輸提供了新的方法.在發(fā)送方知道傳送態(tài)的信息而不擁有這個(gè)態(tài)的情況下,量子遠(yuǎn)程制備通過(guò)使用先前共享的糾纏和經(jīng)典通信實(shí)現(xiàn)了量子態(tài)的安全傳輸.作為一種重要的量子通信方式,量子遠(yuǎn)程制備無(wú)論是在理論還是在實(shí)驗(yàn)上都取得了大量的研究成果,有著廣闊的發(fā)展和應(yīng)用前景.本文對(duì)非理想信道下的受控遠(yuǎn)程制備的協(xié)議進(jìn)行了研究.內(nèi)容主要涉及兩個(gè)方面:部分糾纏信道下受控遠(yuǎn)程制備任意四粒子簇態(tài)和χ態(tài),噪聲信道下雙向受控遠(yuǎn)程制備任意單粒子態(tài).論文取得的主要結(jié)果如下:1、通過(guò)在發(fā)送方和控制方處構(gòu)造合適的測(cè)量基,我們提出了兩個(gè)利用部分糾纏態(tài)作為量子信道的任意四粒子簇態(tài)的受控遠(yuǎn)程制備協(xié)議.接收方通過(guò)執(zhí)行適當(dāng)?shù)幕謴?fù)酉操作,可以分別以概率50%和100%重建要制備的態(tài).和以前的協(xié)議相比,本文的協(xié)議不需要借助輔助粒子和兩粒子酉操作,且成功概率與糾纏信道的系數(shù)無(wú)關(guān).進(jìn)一步,提出了兩個(gè)利用部分糾纏信道實(shí)現(xiàn)任意四粒子χ態(tài)的受控遠(yuǎn)程制備協(xié)議,它們的成功概率仍可以分別達(dá)到50%和100%.2、構(gòu)造了一個(gè)的七粒子最大糾纏態(tài),并且利用其作為量子信道提出了一個(gè)理想狀態(tài)下雙向受控遠(yuǎn)程制備任意單量子態(tài)的協(xié)議.通信雙方均可以以單位概率同時(shí)重建對(duì)方要制備的量子態(tài).并且我們考慮了兩種重要的消散噪聲(振幅阻尼噪聲和相位阻尼噪聲)對(duì)這個(gè)確定性雙向受控遠(yuǎn)程制備協(xié)議的影響.利用保真度描述了初始態(tài)和輸出態(tài)之間的接近程度,分析了噪聲信道的消散率與保真度之間的關(guān)系.并且討論了哪種噪聲環(huán)境下會(huì)有更多的信息丟失.
[Abstract]:Quantum communication is one of the core contents of quantum informatics, which provides a new method for the secure transmission of information. When the sender knows the information of the transport state and does not own the state, quantum remote preparation realizes the secure transmission of the quantum state by using the previously shared entanglement and classical communication. As an important way of quantum communication, quantum remote fabrication has obtained a lot of research results both in theory and experiment, and has broad development and application prospects. In this paper, the protocol of controlled remote fabrication in non-ideal channel is studied. The content mainly involves two aspects: the controlled remote preparation of arbitrary four-particle cluster states and arbitrary single-particle states in the partially entangled channel and the bi-directional controlled remote preparation of arbitrary single-particle states in the noise channel. The main results obtained in this paper are as follows: 1. By constructing appropriate measurement bases at the sender and the controller we propose two controlled remote preparation protocols for arbitrary four-particle cluster states using partially entangled states as quantum channels. By performing appropriate recovery unitary operations, the receiver can reconstruct the states to be prepared with probability of 50% and 100%, respectively. Compared with the previous protocols, the proposed protocol does not require auxiliary particles and two-particle unitary operations, and the probability of success is independent of the coefficients of entangled channels. Furthermore, two controlled remote preparation protocols for any four-particle 蠂 states using partially entangled channels are proposed. Their probability of success can still reach 50% and 100%, respectively, and a seven-particle maximum entangled state is constructed. Using it as a quantum channel, a two-way controlled remote protocol for the preparation of arbitrary single quantum substates in an ideal state is proposed. Both sides of the communication can reconstruct the quantum states to be prepared by each other at the same time in unit probability. We also consider the effects of two important dissipative noises (amplitude damping noise and phase damping noise) on the deterministic bi-directional controlled remote preparation protocol. The degree of proximity between the initial state and the output state is described by the fidelity, and the relationship between the dissipation rate of the noise channel and the fidelity is analyzed. It also discusses which kind of noise environment will lose more information.
【學(xué)位授予單位】：河南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：O413;TN918

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相關(guān)期刊論文 前2條

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2 陳忠芳;劉金明;馬雷;;Deterministic joint remote preparation of an arbitrary two-qubit state in the presence of noise[J];Chinese Physics B;2014年02期

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本文編號(hào)：2461568