TY - Front. Phys. A1 - Xiang Yan, Ya-Fei Yu, Zhi-Ming Zhang T1 - Entanglement concentration for a non-maximally entangled four-photon cluster state Y1 - 2014-10-15 JF - Frontiers of Physics JO - Front. Phys. SP - 640 EP - 645 VL - 9 IS - 5 UR - https://journal.hep.com.cn/fop N1 - 10.1007/s11467-014-0435-z ER -