通过动态几何控制实现极性分子的高保真纠缠
High-fidelity entanglement of polar molecules by dynamic geometric control
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中文总结 AI 辅助
研究超冷分子光镊阵列量子信息系统中分子热运动致相干性降低问题，通过控制偶极相互作用几何结构、利用分子可编程运动抑制热涨落和退相，提高了偶极相干性，产生了高保真度双分子纠缠。
中文摘要 AI 辅助
在由超冷分子的光镊阵列构成的量子信息系统中，分子的热运动降低了其相互作用的相干性，限制了纠缠保真度及这些系统的科学适用性。我们表明，通过控制偶极相互作用的几何结构，即使分子在光镊中占据多个运动状态，也能保持相干性。我们表征了几种抑制对热涨落敏感性的几何结构。此外，在纠缠过程中利用分子可编程的、保持相干性的运动来重新聚焦因光镊相对位置抖动引起的退相，这在10纳米尺度上也相关。这些方法显著提高了偶极相干性，并能在直接激光冷却的分子中产生保真度为\(\mathcal{F}= 0.976^{+0.008}_{-0.011}\)的双分子纠缠。
英文摘要
In quantum information systems made of optical tweezer arrays of ultracold molecules, thermal motion of molecules degrades the coherence of their interactions, which limits entanglement fidelity and the concomitant scientific applicability of these systems. We show that by controlling the geometry of the dipolar interaction, even when a molecule occupies many motional states in the tweezer, coherence can be preserved. We characterize several geometries that suppress sensitivity to thermal fluctuations. We further use programmable, coherence-preserving motion of the molecules during entanglement to refocus dephasing from relative positional jitter of the tweezers, which is relevant even on the 10 nm scale. These methods yield substantially improved dipolar coherence and enable generation of two-molecule entanglement with a Bell state fidelity of $\mathcal{F}= 0.976^{+0.008}_{-0.011}$ in directly laser-cooled molecules.
