Recently cold atoms in optical tweezer arrays have emerged as a versatile platform for quantum science experiments. I will review some of these developments, specifically, atom-by-atom assembly  as a fast and simple method to generate defect-free atomic arrays and Rydberg-based quantum simulation of spin models. While already reaching competitive results, these systems are still in their infancy and limitations in coherence, detection fidelity, and scalability remain. I will outline how we can improve on these issues and open new avenues in quantum metrology by using alkaline earth atoms, followed by an overview of recent results: 1) A record in imaging-fidelity for neutral atoms and demonstration of narrow-line cooling in tweezers [2,3]. 2) High-fidelity Rydberg excitation from a clock state, including a record in entanglement-fidelity for two neutral atoms . 3) Demonstration of an optical clock with single-atom detection in tweezer arrays .
 Endres et al., Science 354, 1024 (2016)
 Covey et. al, Phys. Rev. Lett. 122, 173201 (2019)
 Cooper et al., Phys. Rev. X 8, 041055 (2018)
 Madjarov*, Covey*, et al., arXiv:2001.04455 (2020)
 Madjarov et al., Phys. Rev. X 9, 041052 (2019)
Winter Qtr. Colloq. committee: M. Schleier-Smith (Chair), B. Cabrera, S. Dimopoulos, T. Heinz, S. Kachru & L. Tompkins
Location: Hewlett Teaching Center, Rm. 200