Trapped-ions are among the most successful approaches to realizing quantum computers, realizing the highest fidelity gates and high quality realisations of quantum circuits, including repeated quantum error correction. However it remains a major challenge to scale these systems up towards interconnected arrays of hundreds of ions. I will describe experimental work involving the use of ion traps with integrated photonics, which offers significant advantages for scaling the optical delivery of control light. We have been able to demonstrated high-fidelity entanglement using such traps [1], and furthermore are performing experiments which take advantage of the optical stability available from this platform [2]. Furthermore, I will discuss possibilities to extend control of ions to microtrap arrays using micro-fabricated Penning traps [3], based on our recent first trapping and motional state control. In particular, the observed heating rates are an order of magnitude below any observed in similar size radio-frequency traps, which are more commonly used for quantum computing.

   [1]    K. Mehta et al. Nature 586, 7830 (2020)
   [2]    A. Ricci, arXiv:2210.02597 (2022)
   [3]    S. Jain et al., PRX  10, 3, 031027 (2020)