We propose an experimentally feasible scheme to implement the optimal asymmetric economical 1->3 phase-covariant cloning, which works without ancilla, based on cavity QED.

• 本文提出一个在腔QED中实验上可行的方案来实现最优非对称经济型1到3相位协变克隆，这种克隆是不需要辅助粒子的。