Robust and High-Fidelity Molecular Qubit Operations via Electric-Field Gradient Gates

Despite the high fidelities achievable with trapped atomic ion qubits, their suitability as a platform for quantum computation is impaired by their use of lasers to effect quantum operations, which both require near-ground-state cooling to reach the Lamb-Dicke regime and introduce errors via spontaneous emission. However, it was recently shown (PhysRevA. 2021, 104, 042605) that radio-frequency voltages applied to trap electrodes could be used to achieve a complete, laser-free set of quantum logic operations of molecular ions - Electric Gradient Gates (EGGs). We will discuss EGGs and present numerical simulations that show high-fidelity single- and two-qubit gates are possible in a realistic environment.