噪声环境下二比特量子态远程制备

Abstract

提出利用两对非最大纠缠态作为量子通信通道实现二比特量子态的远程态制备方案，并使用量子纠缠态密度矩阵的Lindblad主方程推导了量子纠缠态的时间演化，研究了噪声条件下三种量子纠缠通道对二比特量子态远程制备保真度的影响。结果表明，噪声条件下由|01>与|10>基构成的量子通道比由|00>与|11>基构成的量子通道更具有保护远程制备量子态保真度的能力，由这两组基构成的混合量子通道得到的保真度正比于上述两种情况保真度之积，其保真度的值介于两者之间。 A scheme is proposed for the remote preparation of a two qubit quantum state by using two nonmaximally entangled states as the quantum channel. The effects of the environment noise on the quantum channels are considered, in which the time-evolution is ruled by the master equations of the density matrices in the Lindblad form. We investigated the influence of environment noise on the fidelity of the remote state preparation based on three types of quantum channels. It is found that the output state of remote state preparation, as time goes on, has a higher fidelity in the case of the quantum channel consists of |01> and |10> basis than that of |00> and |11> basis. Furthermore, the results also demonstrate that the fidelity is proportional to the product of both situations above when the channel consists of the mixture basis, and its value is between of them.