本文選題：樹形三維糾纏態(tài) + NOON態(tài)　； 參考：《延邊大學》2017年碩士論文

【摘要】：隨著量子信息學的發(fā)展,人們逐漸認識了量子糾纏,并對其進行了大量深入的研究。由于量子糾纏的非定域性,使得糾纏態(tài)在量子信息中取得了廣泛的發(fā)展和應用。同時,人們對量子糾纏態(tài)的制備也給予了很大的關注,這不僅促進了相關的理論和實驗技術的發(fā)展,也成功的實現(xiàn)了糾纏態(tài)在多種物理系統(tǒng)中的制備。本文主要介紹基于腔QED系統(tǒng)利用絕熱技術制備新穎的樹形三維糾纏態(tài)和NOON態(tài)的方案。文章的主要內(nèi)容如下:基于絕熱技術,我們提出了一個制備新穎樹形三維糾纏態(tài)的方案。在我們的方案中,一個原子和兩個玻色愛因斯坦凝聚被分別地捕獲在三個空間分離的光學腔中。這三個光學腔用兩個光纖來連接。通過數(shù)值解主方程,我們研究了多種耗散過程對保真度的影響,如原子的自發(fā)輻射和光子的泄漏。數(shù)值模擬表明,我們的方案對由腔和光纖中光子的泄漏和原子的自發(fā)輻射引起的消相干具有魯棒性。我們能以很高的保真度獲得這個新穎的樹形三維糾纏態(tài)�；贚ewis-Riesenfeld不變量理論和量子Zeno動力學構造絕熱捷徑,我們提出了一個快速制備NOON態(tài)的方案。在方案中,用兩個光纖連接三個遠距離光學腔系統(tǒng),兩列A型三能級原子被分別地捕獲在橫向的光學晶格中,并分別在腔A和腔C中同時輸入和輸出,一個雙重A型原子被捕獲在腔B中。我們通過數(shù)值分析方法研究了光子的泄漏對保真度的影響。數(shù)值模擬結果表明,我們的方案不僅操作時間短,而且對消相干具有魯棒性。以上這些方案在現(xiàn)有的實驗條件下都是可以實現(xiàn)的。這些方案將為量子通訊和量子計算的實驗實現(xiàn)提供可靠的理論依據(jù)。
[Abstract]:With the development of quantum informatics, quantum entanglement has been gradually recognized and studied deeply. Due to the non-localization of quantum entanglement, entangled states have been widely developed and applied in quantum information. At the same time, people pay great attention to the preparation of quantum entangled states, which not only promote the development of related theory and experimental technology, but also successfully realize the preparation of entangled states in various physical systems. In this paper, we introduce a novel scheme for the preparation of dendritic three-dimensional entangled states and NOON states by using adiabatic technique in cavity QED system. The main contents of this paper are as follows: based on adiabatic technique, we propose a scheme to prepare a novel tree-shaped three-dimensional entangled state. In our scheme, one atom and two Bose-Einstein condensates are trapped in three spatially separated optical cavities. The three optical cavities are connected by two optical fibers. By solving the master equation numerically, we study the effects of various dissipative processes on the fidelity, such as spontaneous emission of atoms and photon leakage. Numerical simulation shows that our scheme is robust to the decoherence caused by photon leakage in cavity and fiber and spontaneous emission of atoms. We can obtain this novel tree-shaped three-dimensional entangled state with high fidelity. Based on Lewis-Riesenfeld invariant theory and quantum Zeno dynamics to construct adiabatic shortcuts, we propose a scheme for rapid preparation of NOON states. In the scheme, three long distance optical cavity systems are connected with two optical fibers, and two A-type three-level atoms are trapped in the transverse optical lattice, and input and output are simultaneously in cavity A and cavity C. A double A atom is trapped in cavity B. We studied the effect of photon leakage on fidelity by numerical analysis. The numerical simulation results show that our scheme is not only short operation time, but also robust to decoherence. These schemes can be implemented under the existing experimental conditions. These schemes will provide a reliable theoretical basis for the experimental realization of quantum communication and quantum computing.
【學位授予單位】：延邊大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O413.1

【參考文獻】

相關博士學位論文 前1條

1 張國鋒;量子糾纏的若干問題研究[D];山西大學;2004年

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本文編號：2105101