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2. Entanglement purification protocol (EPP) (EPP based on CNOT gates WF=F|y)〈|+ y+) +)(+|+ 小B1(B/B+vAV)B) AB (|H)AV)B±V)A|H)B B:|+)→+),B;)→,B:+→ Charles H. Bennett. et al., Phys. Rev. Lett. 76, 722 (1996)(1) EPP based on CNOT gates Charles H. Bennett. et al., Phys. Rev. Lett. 76, 722 (1996) 2. Entanglement purification protocol (EPP)