2000-times repeated imaging of strontium atoms in clock-magic tweezer arrays

Understand

We demonstrate single-atom resolved imaging with a survival probability of $0.99932(8)$ and a fidelity of $0.99991(1)$, enabling us to perform repeated high-fidelity imaging of single atoms in tweezers for thousands of times.

• We further observe lifetimes under laser cooling of more than seven minutes, an order of magnitude longer than in previous tweezer studies.
• Experiments are performed with strontium atoms in $813.4~\text{nm}$ tweezer arrays, which is at a magic wavelength for the clock transition.
• Tuning to this wavelength is enabled by off-magic Sisyphus cooling on the intercombination line, which lets us choose the tweezer wavelength almost arbitrarily.