Improvement on controlled-controlled-NOT operation-based entanglement purification protocol |
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| Authors: | Yuanyuan Xu Xunli Feng and Zhiming Zhang |
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| Affiliation: | 1 Laboratory of Photonic Information Technology,SIPSE and LQIT,South China Normal University,Guangzhou 510006,China 2 Department of Physics and Centre for Quantum Technologies,National University of Singapore 2,Science Drive 3,Singapore 117542 |
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| Abstract: | We show that controlled-controlled-NOT(CCN)operation-based entanglement purification protocol can be further improved.CCN protocol requires Bell state measurements after performing the CCN operations.In the original CCN protocol,the measured states are assumed to be destroyed.However,if controlled-NOT gates are used to perform such Bell state measurements,in some unsuccessful situations of the CCN protocol,one can further purify the two mixed entangled states which are to be measured.In this way,the total efficiency of the CCN protocol is further increased. |
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