本文提出了一种利用弱测量进行纠缠预补偿的方法。首先分析了十粒子Cluster态的受控双向量子隐形传态的传输过程, 通过理论推导给出了不同测量基下相应的幺正变换, 成功得到对方待传的未知量子态。在此基础上重点研究了振幅阻尼噪声对量子隐形传态纠缠保真度的影响, 并根据弱测量和反馈测量对量子传输信道的调控特性, 提出了预补偿的纠缠优化方法。理论分析与性能仿真结果表明, 相比于现有纠缠优化方法, 本方法不需要引入任何辅助粒子和复杂的系统操作就能获得更高的隐形传态保真度, 对克服纠缠退相干带来的隐形传态质量下降具有一定意义。

The influence of environmental noise can cause decoherence of quantum states, and the quality of teleportation can be seriously damaged and even leads to communication fails in quantum teleportation.In order to overcome this problem, a method of entanglement pre-compensation using weak measurements is proposed.Firstly, the bidirectional quantum controlled teleportation through ten-qubit cluster state is analyzed, and the corresponding unitary transformation under different measurement bases is given by theoretical derivation, thus the unknown quantum states of the other party to be transmitted is successfully obtained.On this basis, we focus on the study of the amplitude damping effect on teleportation of quantum entanglement fidelity.And according to the control characteristics of weak measurement and reversing measurement over the quantum transmission channel, a method of pre-compensation entanglement optimization is proposed.Theoretical analysis and simulation results show that, comparing with the existing entanglement optimization method, our method does not require the introduction of any auxiliary particles and complex operation system.And higher teleportation fidelity can be obtained obviously.It is of great significance for bidirectional quantum controlled teleportation of cluster state to overcome the decrease of teleportation quality caused by entanglement decoherence.