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Experimental setup A detailed description of our experimental setup has been given in previous works35,60,61. In short, we trap individual 88Sr atoms in a programmable one-dimensional array of optical tweezers (813 nm) generated by acousto-optic deflectors (AODs). The atoms are initialized in the 5s2 1S0 state and cooled on the narrow-line red transition 5s2 1S0 ↔ 5s5p 3P1
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