量子计算与量子模拟中离子阱结构研究进展

离子阱系统是实现量子计算和量子模拟的主要体系之一.世界范围内的各个离子阱研究小组共同推动着离子阱结构的丰富化发展,开发出一系列高性能的三维离子阱、二维离子芯片、以及具有集成器件的离子阱系统.离子阱的结构逐渐向小型化、高通光性和集成化方向发展,并表现出卓越的量子操控能力—对多离子的囚禁能力和精确控制能力越来越高.本综述将总结过去的十几年里离子阱在结构上的演化历程,以及离子阱在量子计算与量子模拟实验研究中的最新进展.通过分析具有代表性的离子阱结构,总结离子阱系统在加工工艺、鲁棒性和多功能性等方面取得的进步,并对基于离子阱系统的可扩展量子计算与模拟作出展望.     

Thermal expanded core ultraviolet fiber for optical cavity mode matching

We have demonstrated a mode matching method between two different fibers by a hybrid thermal expanded core technique, which can be applied to match the modes of fiber-based Fabry–Pérot cavities. Experimentally, this method has achieved an expansion of the ultraviolet fiber core by 3.5 times while keeping fundamental mode propagation. With the experiment parameters, the fundamental mode coupling efficiency between the fiber and micro-cavity can reach 95% for a plano-concave cavity with a length of 400 μm. This method can not only have potential in quantum photonics research but also can be applied in classical optical fields.     

Ringing phenomenon in silica microspheres

Whispering gallery modes in silica microspheres are excited by a tunable continuous-wave laser through the fiber taper. Ringing phenomenon can be observed with high frequency sweeping speed. The thermal nonlinearity in the microsphere can enhance this phenomenon. Our measurement results agree very well with the theoretical predictions by the dynamic equation.