The Bell state is the key element of quantum information,and its quantum cloning is very closely connected with many im-portant information processing tasks.In this paper,we present a simple scheme for Bell state cloning by using local operation,classi-cal communication and assisted entanglement,by which we only use Controlled-NOT gate(CONT),beam splitters(BS),polarized beam splitters(PBS)and particle detectors.Firstly,we perform a CONT operation on both the unknown Bell state and the auxiliary Bell state simultaneously,then perform a PBS operation on the particles at one output port of the CONT gate and use a particle detec-tor to measure the number of particles at one output port of the PBS.At the same time,we also perform a second CONT gate opera-tion on the another output port of the CONT gate.If the detector measurement result is even,the unknown Bell state realizes local cloning directly;If the detector result is odd,a third CONT operation is required to complete the local cloning.The entire scheme can clone any Bell state after three CONT gate operations at most.The scheme of this paper is helpful for the measurement and anal-ysis of Bell state.
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