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  • 學位論文

具雜訊光相干態量子通道的糾纏度純化

Entanglement Purification for Noisy Optical Coherent-State Quantum Channels

指導教授 : 吳欣澤
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摘要


本論文探討由 Jeong 和 Ralph 所提出在相干態量子資訊處理系統中的糾纏純化方案。我們詳究一個(準)貝爾態量子通道在具有光子數耗散時,如何利用此方案恢復其相干性,同時也拓展本方案,應用在一般Werner形式的混態糾纏純化。我們發現,相對於離散變數系統,本論文研究的連續變數方案,其純化所需保真度門檻值較低,而且純化效率也較高。

並列摘要


We investigate an entanglement purification protocol suggested by Jeong and Ralph for coherent-state quantum information processing. We study in detail the purification of a (quasi) Bell-state quantum channel subject to photon loss utilizing this protocol and also extend its application to general Werner-type mixed states. We compare this protocol with its discrete-variable counterpart and show that a lower fidelity threshold and higher efficiency for purification are attained.

參考文獻


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