Journal of Yantai University
Controlled Quantum Teleportation of N-Particle Partly Entangled State
Fangxia Guo
Abstract
Most of quantum states in reality are non-maximal entangled states due to environmental coupling in preparation and transmission.A controlled method is presented for N-particle partly entangled state teleportation using non-maximally entangled quantum channel.In the proposed approach,a non-maximally entangled(N+2)-particle state is utilized as the quantum channel,one of the particles is selected as the controlling particle.The sender makes Bell states measurement once,Hadamard operations and |0〉 |1〉states measurements for N-1 times,and the controller performs a Hadamard measurement,whereafter the receiver makes appropriate unitary transformations and necessary projection measurements based on the sender's and controller's measurement results,then the controlled teleportation of N-particle unknown quantum state is achieved.The method is a controlled quantum teleportation scheme based on non-maximally entangled state with certain odds and the success probability is 2|a|2.