量子态的制备和量子纠缠的操控是进行量子信息处理的基础，超冷极性分子因其具有的永久电偶极矩以及可控的长程偶极-偶极相互作用，成为一种有效的量子态存储介质。本项目将在基于超冷极性分子实验系统的基础上，将超冷极性分子作为量子比特载体，研究利用极性分子间的偶极-偶极相互作用实现分子间纠缠控制这一国际研究热点和难点问题。采用光缔合方法和级联自发辐射获得纯基态超冷RbCs极性分子，制备一维光格子中的超冷极性分子样品，研究在外加微波场作用下的基态转动能级间的转移机制和梯度电场作用下的偶极-偶极相互作用动力学行为。通过微波场精确操控超冷极性分子的内态，研究分子内态受控激发导致的偶极-偶极相互作用变化和退相干过程，从而提高量子纠缠的操控效率。一维光格子中分子量子纠缠态的制备与操控将成为超冷分子作为量子比特单元的重要技术突破。

The preparation of quantum state and manipulation of quantum entanglement are the foundation of quantum information processing. Ultracold polar molecules have the permanent electric dipole moment and the controllable long range dipole-dipole interaction, which enable them to act as an effective storage medium of quantum state. This project will be based on ultracold polar molecules as the experimental platform, and use ultracold polar molecules as qubit carrier, then study the dipole-dipole interaction and achieve entanglement control between the molecules, which is the international hotspot and difficult issues of this field. Using the photoassociation and two-photon-cascade spontaneous emission to obtain pure ground state RbCs ultracold polar molecules, with the preparation of the sample of ultracold polar molecules in a one-dimensional optical lattice, we will study the transfer mechanism between the rotational levels of the ground state under a microwave field and dipole-dipole interaction dynamics behavior under a gradient electric field. By precise control the internal state of ultracold polar molecules by the microwave field, we will study the decoherence process and the dipole-dipole interaction process, which are controlled by excitation of molecular internal state. This will result in the improvement of the efficiency of quantum entanglement manipulation. The preparation of quantum state and manipulation of quantum entanglement in a one-dimensional optical lattice will become an important technological breakthrough for the achievement of ultracold molecules as qubits unit.