Research On Laser System In Rydberg Atom Experiment

Single-atom arrays can be used as an effective carrier for qubits due to their strong scalability,quantum state initialization fidelity,and long coherence time.The long-range interaction between Rydberg atoms can create quantum entanglement in such a single-atom array.Therefore,Rydberg single-atom array experiment is a promising hardware foundation for quantum computers and actively stimulates the development of quantum information technology.We plan to build such a system from scratch.In this article,we will focus on the laser systems required for the Rydberg single-atom array experiment.Firstly,we assembled and baked the vacuum system to provide a good vacuum condition for the experiment.Starting from the interaction between atoms and light,the basic principles of laser cooling and trapping of atoms are derived.Then we designed suitable coils to generate the magnetic field gradient required to trap the atomic assemble.Based on this,the ⁸⁷Rb atom cooling beam optical path was designed,and the frequency locking of the cooling laser was realized.We also designed the RF and timing control modules required for cooling.Secondly,by using the grating as a diffractive optical element,we designed a extended external cavity diode laser with Littrow configuration.We also tested its output threshold and beam quality.The above work provided the repumping laser source for the Rydberg single-atom array experiment.Finally,in order to generate the Raman lasers required for state transfer,a setup involving an optical resonator filter and an EOM is designed,so that two laser beams with a frequency difference of 6.8 GHz can be obtained from a laser.A temperature preserving structure for the Fabry-Perot cavity was designed,so that the laser power jitter is maintained within 1.5%.The above work has laid a foundation for future quantum optics research with Rydberg atoms.