Hybrid cavity QED with Rydberg ions and superconducting circuits

量子计算的混合方法结合了多个物理系统的吸引人的特点。在这个项目中，目标是将圆形里德堡态的离子耦合到超导谐振器上。圆形里德堡态具有很长的寿命，这使得它们适合用作量子存储器，而超导量子比特具有快速的门时间但短的相干时间。在伦敦大学学院，我们处于世界领先地位，因为已经实现了将中性里德堡原子束耦合到超导谐振器的实验设备。耦合里德堡离子将是一个已经是同类最好结果的下一次迭代。这项研究将首先设计一种方案，在环形里德堡态中预制一束钡离子，并进行微波光谱分析，这提供了以前所未有的精度测量这些态的能力。在该项目的第二阶段，里德堡离子束将被纳入里德堡原子-谐振器耦合实验。最终目标将是在谐振器附近捕获单个里德堡离子，并实现强耦合。这一结果可能会开辟途径，如通过超导电路耦合里德伯格离子，以及量子网络所需的微波到光光子的转换。

Hybrid approaches to quantum computing combine the attractive characteristics of multiple physical systems. In this project the aim is to couple ions in circular Rydberg states to a superconducting resonator. Circular Rydberg states have long lifetimes which makes them suitable for use as a quantum memory, whereas superconducting qubits have fast gate times but short coherence times. At UCL we are in a world leading position, as the experimental apparatus for coupling a beam of neutral Rydberg atoms to a superconducting resonator has already been realised. Coupling Rydberg ions will be the next iteration to an already best in class result. The research will begin by devising a scheme to pre- pare a beam of Barium ions in circular Rydberg states and performing microwave spectroscopy, which offers the ability to measure the states with unprecedented precision. In phase two of the project the Rydberg ion beam will be incorporated into the Rydberg atom - resonator coupling experiment. The ultimate aim will be to trap a single Rydberg ion close to the resonator and achieve strong coupling. This result could open up avenues such as coupling Rydberg ions via superconducting circuitry, and microwave to optical photon conversion which is a requirement for quantum networks.