Coherent manipulation of interacting electron qubits on solid neon

Abstract: Solid neon has emerged as a pristine material host for electron qubits. Single electron-on-solid-neon (eNe) charge qubits have shown extraordinarily long coherence times and high operation fidelities. Realizing two-qubit gates in this platform is the next major step for realistic quantum information processing. In this work, we demonstrate frequency- and time-domain coherent manipulation of multiple eNe charge qubits that are coupled by charge interactions. Cross-resonance and bSWAP two-qubit gates are implemented, laying the foundation for universal quantum computing. An inter-qubit coupling strength exceeding 60~MHz has been observed, promising fast gate speed and suppressed infidelity. These results highlight the potential to scale up the eNe qubit platform toward universal quantum computing.