Abstract: Trapped ion systems are a leading platform for quantum information processing, but they are currently limited to 1D and 2D arrays, which imposes restrictions on both their scalability and their range of applications. In this talk, I will propose a path to overcome this limitation by demonstrating that Penning traps can be used to realize remarkably clean bilayer crystals, wherein hundreds of ions self-organize into two well-defined layers. I will show how these bilayer crystals are made possible by the inclusion of an anharmonic trapping potential, which is readily implementable with current technology. Furthermore, I will discuss the normal modes of this system, which exhibit salient differences compared to the modes of single-plane crystals. I will also illustrate how the bilayer geometry and the unique properties of the normal modes open new opportunities, in particular in quantum sensing and quantum simulation, that are not straightforward in single-plane crystals. Excitingly, it may be possible to extend the ideas presented here to realize multilayer crystals with more than two layers. Our work increases the dimensionality of trapped ion systems by efficiently utilizing all three spatial dimensions and lays the foundation for a new generation of quantum information processing experiments with multilayer 3D crystals of trapped ions.
References:
[1] S. Hawaldar, P. Shahi, A.L. Carter, A.M. Rey, J.J. Bollinger and A. Shankar, Bilayer crystals of trapped ions for quantum information processing, arXiv:2312.10681 (Dec 2023)