量子信息科学在经济发展、国家安全和社会进步等方面有着重要的意义。量子态的制备和操控是进行量子信息处理的基础，外场作用下的超冷极性分子气体因其具有永久的电偶极矩和可控的长程偶极-偶极相互作用而成为一种有效的量子态存储介质。本项目将在超冷极性分子实验系统的基础上，重点研究超冷极性分子量子气体的高效制备和分子量子态操控的新机制。通过磁缔合Feshbach共振技术将温度在微开量级的超冷原子缔合成近离解限的弱束缚超冷分子，再采用受激Raman绝热通道技术,获得高密度长寿命振转能级可控的基态超冷铷铯分子。研究高密度超冷极性分子气体在光格子中的受控机制并研究其碰撞特性及其退相干过程。研究不同外电场条件下的超冷极性分子偶极-偶极相互作用和分子扩散的动力学过程，在超冷极性分子介质中研究分子-分子纠缠态的制备与测量。发展对分子量子态制备和操控的新原理和新技术，在分子量子态的制备、操控及测量方面取得重要进展。

Quantum information science has inestimable value in economy development, national security, and society advancement. The preparation and manipulation of quantum state is the foundation of quantum information processing. Ultracold polar molecules have the permanent electric dipole moment and the controllable long range dipole-dipole interaction by external field, which enable them to act as a effective storage medium of quantum state and get many attentions from researchers. Based on the experimental platform of ultrcold polar molecules, we will mainly study the new methods for efficiently preparation of ultracold polar moleculars and manipulation of molecular quantum state. Using the polarization gradients laser cooling and evaporative cooling, the temperature of Rb and Cs atoms can be cooled down to about several microkelvin with high density. Using magnetic Feshbach resonances technique, the ultracold molecules can be prepared in the weakly bound state near the dissociation limit. Then using the two photon stimulated Raman adiabatic passage techniques, we will get the ultrcold RbCs moleculars with high density, long lifetime, and selectable rovibrational level in the absolute ground state. There is the dipole-dipole interaction of ultracold polar molecules with external field, we can investigate the molecular collision property and decoherence progress. Then we will load the ground state polar molecular into optical lattice, and study the quantum entanglement preparation and measurement. These development will be useful for the new principle and method of manipulating polar moleculars as quantum states, and will obtain some important progress in molecular quantum state preparation, manipulation and measurement.