Above 99.9% fidelity and survival imaging of ytterbium 171 atom in clock-magic tweezer

Neutral atom array has emerged as a promising modality for quantum information science. Among diverse atomic elements, ytterbium 171 is especially getting attention due to their alkaline-earth-like electronics structure for new quantum control availability and unique characteristic of nuclear spin 1/2 states which can be used as a highly coherent qubit. These features allow high fidelity and low loss imaging in several-ms time scale, but achieving both fidelity and survival above 99.9% has not been demonstrated in tweezers, to our knowledge, which is an important milestone not only for very precise qubit measurement, but also for large-scale system of thousands of qubits. In this presentation, we report above 99.9% fidelity and survival for imaging ytterbium 171 array in clock-magic tweezers of 759 nm wavelength. We explain how alternating dual-tone narrowline cooling can be efficiently used for imaging, in good agreement with a Monte Carlo simulation considering momentum damping and diffusion dynamics from the laser cooling. Also, we discuss possible further improvements.