Expérimental
The purpose of the proposed PhD work is to build a new experimental set-up to prepare arrays of circular state atoms of strontium in a cryogenic environment. This requires trapping ground state strontium atom in optical tweezers, transferring them into the circular state, and capturing the circular state again using a tweezers tune close to the optical transition of the ionic core. Then, we will demonstrate that it is possible to measure the state of the Rydberg atom by using the selective fluorescence of the second valence electron. During master internship, the student will set up the laser system to cool and trap ground state strontium atom in optical tweezers.