Experiments with ultracold polar molecules in magic traps

超冷极性分子为基础物理和化学的研究以及量子科学和技术的应用提供了许多令人兴奋的机会。这个博士项目将使用一种能够在微开尔文温度下产生4000个基态红细胞分子气体的设备。该装置的工作原理是将铷（Rb）和铯（Cs）的超冷混合物中的原子结合在一起形成分子。该项目将专注于利用光学、微波、磁场和电场的组合来控制分子的内部和外部自由度。内部状态可以用微波完全控制，而光晶格，由驻波制成的陷阱，可以用来限制分子的空间，防止有耗碰撞。特别是，该项目试图展示一种新的神奇波长陷阱的发展，在这种陷阱中，分子的旋转状态经历了相同的AC斯塔克位移。这使得长寿命的旋转相干成为可能，并为量子磁性模拟和精密测量开辟了新的可能性。

Ultracold polar molecules offer many exciting opportunities for the study of fundamental physics and chemistry, as well as applications in quantum science and technology. This PhD project will make use of an apparatus capable of producing a gas of 4000 ground-state RbCs molecules at microkelvin temperatures. The apparatus works by binding together atoms from an ultracold mixture of Rubidium (Rb) and Caesium (Cs) to form the molecules. The project will focus on controlling the internal and external degrees of freedom of the molecules using a combination of optical, microwave, magnetic and electric fields. The internal state can be fully controlled with microwaves whilst optical lattices, traps made from a standing wave of light, can be used to confine the molecules spatially, preventing lossy collisions. In particular, the project seeks to demonstrate the development of a new magic wavelength trap where rotational states of the molecules experience the same AC Stark shifts. This enables long-lived rotational coherences and opens up new possibilities for the simulation of quantum magnetism and precision measurement.