Efficient entanglement purification for doubly entangled photon state  

作　　者：WANG Chuan SHENG YuBo LI XiHan DENG FuGuo ZHANG Wei LONG GuiLu 

机构地区：[1]School of Science,Beijing University of Posts and Telecommunications,Beijing 100876,China [2]Institute of Low Energy,Nuclear Physics,and Department of Material Science and Engineering,Beijing Normal University,Beijing 100875,China [3]Department of Electronic Engineering,Tsinghua University,Beijing 100084,China [4]Department of Physics,Tsinghua University,Beijing 100084,China [5]Tsinghua National Laboratory for Information Science and Technology,Tsinghua University,Beijing 100084,China

出　　处：《Science China(Technological Sciences)》2009年第12期3464-3467,共4页中国科学（技术科学英文版）

基　　金：Supported by the National Natural Science Foundation of China(Grant Nos.10604008,10874098,10775076);the National Fundamental Research Program of China(Grant No.2006CB921106)

摘　　要：In this paper,we present an efficient purification scheme that improves the efficiency of entanglement purification of the recently proposed entanglement purification scheme for doubly entangled photon states (Phys.Rev.A,2008,77:042315).This modified scheme contains the bit-flip error correction where all the photon pairs can be kept while all the bit-flip errors are corrected and the entanglement purification of phase-flip errors where a wavelength conversion process is used.This scheme has the advantage of high efficiency and a much lower minimum fidelity of the original state.It works under existing technology.In this paper, we present an efficient purification scheme that improves the efficiency of entanglement purification of the recently proposed entanglement purification scheme for doubly entangled photon states (Phys. Rev. A, 2008, 77: 042315). This modified scheme contains the bit-flip error correction where all the photon pairs can be kept while all the bit-flip errors are corrected and the entanglement purification of phase-flip errors where a wavelength conversion process is used. This scheme has the advantage of high efficiency and a much lower minimum fidelity of the original state. It works under existing technology.

关 键 词：ENTANGLEMENT PURIFICATION DOUBLY ENTANGLED PHOTON state QUANTUM communication 

分 类 号：O431.2[机械工程—光学工程]