Coulomb interaction-driven two-qubit logic between charges on solid neon

Electron-on-solid-neon (eNe) charge qubits hold promise as an emergent solid-state qubit platform due to their long coherence and high operation fidelity. Here, we present the realization of coherent interfaces between charge qubits on solid neon via near-range Coulomb interaction. We observed clear spectroscopic evidence of strong exchange coupling between two charge qubits, one of which (Qubit A) strongly couples to a superconducting resonator while the other (Qubit B) does not. We drive Qubit B with a Cross-Resonance (CR) type all-microwave two-qubit gate through Qubit A, whose Rabi oscillation reveals Qubit B's frequency and Coulomb interaction strength. Moreover, we report driving the double-excited state of the coupled system with monochromatic pumping near the middle point of the two qubits' transition frequencies, corresponding to the bSWAP type of two-qubit gate. These results open the door for scaling up eNe qubits via near-range interactions.