由集成光子激光驱动的单比特和双比特门

中文摘要 AI 辅助

囚禁离子是量子计算的一项领先技术，但其对定制的台式激光和光学系统的依赖仍然是实现可扩展性和鲁棒性的主要障碍。与未来表面电极离子阱单片集成兼容的集成氮化硅激光器，最近已展示了频率选择性的量子比特态制备与测量，以及光学钟跃迁的询问。然而，由集成激光源驱动的相干量子比特门尚未被证明，因为相干量子逻辑对激光器的性能要求要严格得多。在此，我们使用一种稳定到集成线圈谐振器的可见光波长集成布里渊激光器，来驱动$^{88}$Sr$^+$光学量子比特的相干单比特和双比特门。我们通过随机基准测试测得每个克利福德门的平均单比特保真度为99.61% ± 0.03%，并使用双比特Mølmer-Sørensen相互作用生成纠缠贝尔态，其保真度为92.35% ± 1.50%。该量子比特表现出660 ± 9 μs的裸拉姆齐相干时间，通过自旋回波延长至1.750 ± 0.033 ms。这些结果表明，集成可见光波长窄线宽光子激光器能够满足相干囚禁离子量子逻辑的相位噪声要求，为在囚禁离子量子处理器中集成可扩展光学系统提供了一条路径。

英文摘要

Trapped ions are a leading technology for quantum computing, but their reliance on bespoke tabletop laser and optical systems remains a major obstacle to scaling and robustness. Integrated silicon nitride lasers, compatible with future monolithic integration with surface electrode ion traps, have recently demonstrated frequency-selective qubit state preparation and measurement as well as interrogation of an optical clock transition. However, coherent qubit gates impose even more stringent requirements on laser phase noise, and their implementation with integrated laser sources has remained an outstanding challenge. Here, we use a visible-wavelength integrated Brillouin laser stabilized to an integrated coil resonator to drive coherent single- and two-qubit gates with \Sr optical qubits. We measure an average single-qubit fidelity of $99.61\%\pm 0.03\%$ per Clifford gate with randomized benchmarking and use a two-qubit Mølmer-Sørensen interaction to generate an entangled Bell state with a fidelity of $92.35\% \pm 1.50\%$. The qubit exhibits a bare Ramsey coherence time of $659 \pm 9~μ$s, more than a tenfold improvement over our previous implementation, which extends to $1.750 \pm 0.033$~ms with an echo. These results demonstrate, for the first time, that integrated visible-wavelength narrow-linewidth photonic lasers can meet the phase-noise requirements for coherent quantum logic with trapped ion optical qubits, providing a path for scalable optical systems integrated within trapped ion quantum processors.

发表机构

• University of Massachusetts Amherst（马萨诸塞大学阿默斯特分校）
• University of California Santa Barbara（加州大学圣塔芭芭拉分校）

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