Fig. 3: Inter-ququart gates based on Rydberg transitions.
From: An architecture for two-qubit encoding in neutral ytterbium-171 atoms
Rydberg coupling is accessed is accessed through a single-photon transition of λ = 302 nm from 3P0 states to high-principle quantum number states. a One stretched Rydberg transition is driven on two nearby atoms, achieving inter-atom entanglement via Rydberg blockade. With the two-qubit encoding, this inter-ququart gate performs a CCCZ gate. b Inter-ququart CZ gates on the “o”-qubits of two ququarts. Both stretched Rydberg transitions are driven with the same Rabi frequency, detuning, and phase such that both 3P0 states can couple to Rydberg states.
