Neutral Atom Qubits

Ytterbium, rubidium, cesium, and strontium atoms

Trapping Technique

1. Atoms trapped in optical lattices: standing wave patterns from interfering laser beams
2. Optical tweezers: focused laser beams create individual trapping sites
3. Dipole trap: atoms attracted to high-intensity regions of laser field
4. Lattice spacing controlled by laser wavelength and geometry
5. Atoms laser-cooled to microkelvin temperatures
6. Arrays of hundreds to thousands of atoms can be trapped simultaneously
7. Atoms can be dynamically rearranged by moving tweezers

Gate Mechanism

1. Single-qubit gates via laser or microwave pulses addressing individual atoms
2. Raman transitions or direct optical transitions drive qubit rotations
3. Microwave pulses used for hyperfine qubits
4. Two-qubit gates via Rydberg blockade: exciting one atom prevents excitation of nearby atoms
5. Rydberg interactions create strong dipole-dipole coupling
6. Controlled-phase gates implemented via Rydberg state interactions
7. Long-range interactions enable gates between distant atoms