A novel two-qubit entangling gate for trapped-ion quantum processors is proposed theoretically and demonstrated experimentally. During the gate, double-dressed quantum states are created by applying a phase-modulated continuous driving field. The speed of this quantum gate is an order of magnitude higher than that of previously demonstrated rf controlled two-qubit entangling gates in static magnetic field gradients. At the same time, the field driving the gate dynamically decouples the qubits from amplitude and frequency noise, increasing the qubits’ coherence time by 3 orders of magnitude. The gate requires only a single continuous rf field per qubit, making it well suited for scaling a quantum processor to large numbers of qubits. Implementing this entangling gate, we generate the Bell states |Φ+⟩ and |Ψ+⟩ in less than or equal to 313 μs with fidelities up to 98−3+2% in a static magnetic gradient of only 19.09 T/m. At higher magnetic field gradients, the entangling gate speed can be further improved to match that of laser-based counterparts. Published by the American Physical Society 2025

中文翻译：

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用于阱离子量子计算的快速、稳健且无激光的通用纠缠门

从理论上提出了一种用于阱离子量子处理器的新型双量子比特纠缠门，并进行了实验演示。在门期间，通过施加相位调制连续驱动场来创建双重装订量子态。这个量子门的速度比以前演示的静态磁场梯度中射频控制的双量子比特纠缠门高一个数量级。同时，驱动门的磁场将量子比特与幅度和频率噪声动态解耦，从而将量子比特的相干时间增加 3 个数量级。该门每个量子比特只需要一个连续的射频场，因此非常适合将量子处理器扩展到大量量子比特。实现这个纠缠门，我们在小于或等于 313 μs 的时间内生成贝尔态 |Φ+⟩ 和 |Ψ+⟩，保真度高达 98−3+2%，静磁梯度仅为 19.09 T/m。在更高的磁场梯度下，可以进一步提高纠缠栅极速度，以匹配基于激光的栅极速度。 美国物理学会 2025 年出版