Han Jia-Xing, Hu Yuan, Jin Yu, Zhang Guo-Feng
Key Laboratory of Micro-Nano Measurement-Manipulation and Physics (Ministry of Education), School of Physics and Nuclear Energy Engineering, Beihang University, Xueyuan Road No. 37, Beijing 100191, China.
J Chem Phys. 2016 Apr 7;144(13):134308. doi: 10.1063/1.4945384.
An array of ultracold polar molecules trapped in an external electric field is regarded as a promising carrier of quantum information. Under the action of this field, molecules are compelled to undergo pendular oscillations by the Stark effect. Particular attention has been paid to the influence of intrinsic decoherence on the model of linear polar molecular pendular states, thereby we evaluate the tripartite entanglement with negativity, as well as fidelity of bipartite quantum systems for input and output signals using electric dipole moments of polar molecules as qubits. According to this study, we consider three typical initial states for both systems, respectively, and investigate the temporal evolution with variable values of the external field intensity, the intrinsic decoherence factor, and the dipole-dipole interaction. Thus, we demonstrate the sound selection of these three main parameters to obtain the best entanglement degree and fidelity.
捕获在外部电场中的超冷极性分子阵列被视为一种很有前景的量子信息载体。在该电场的作用下，分子因斯塔克效应而被迫进行摆动振荡。人们特别关注内禀退相干对线性极性分子摆动态模型的影响，因此我们用负性来评估三方纠缠，并使用极性分子的电偶极矩作为量子比特来评估二分量子系统对于输入和输出信号的保真度。根据这项研究，我们分别为两个系统考虑三种典型的初始状态，并研究外部场强、内禀退相干因子和偶极 - 偶极相互作用的可变值下的时间演化。因此，我们证明了对这三个主要参数进行合理选择可获得最佳的纠缠度和保真度。
