动量纠缠的大质量粒子的贝尔不等式违背
Bell inequality violation with momentum-entangled massive particles
- Research School of Physics, Australian National University（澳大利亚国立大学物理研究学院）
- School of Mathematics and Physics, University of Queensland（昆士兰大学数学与物理学院）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
该研究首次利用物质波干涉术操控的动量纠缠亚稳态氦原子，测得CHSH贝尔参数为2.52±0.17，实现了大质量粒子运动态的贝尔不等式违背，为量子非局域性及量子力学与引力的相互作用研究开辟了新方向。
AI中文摘要：
贝尔定理揭示了量子力学与定域实在论预言之间的根本不相容性。此后，贝尔不等式违背已通过光子和大质量粒子的内部态证明了量子非局域性，但从未利用其运动态实现。本研究首次报道了大质量粒子运动态的贝尔不等式违背：利用物质波干涉术操控的亚稳态氦原子动量纠缠对，测量得到克劳泽-霍恩-希米尼-霍尔特（CHSH）贝尔参数为 $S = 2.52 \pm 0.17$，违背了 $S \leq 2$ 的CHSH贝尔不等式。本研究完成了量子原子光学领域的长期目标，将贝尔测试从内部量子变量扩展到大质量粒子的外部自由度，为探索物质波中的量子非局域性、研究量子力学与引力的相互作用开辟了新领域。
英文摘要：
Bell's theorem revealed the fundamental incompatibility between the predictions of quantum mechanics and local realism. Bell inequality violations have since demonstrated quantum nonlocality using photons and internal states of massive particles, but never using their motional states. Here we report the first Bell inequality violation in the motional states of massive particles. Using momentum-entangled pairs of metastable helium atoms manipulated by matter-wave interferometry, we measure a Clauser-Horne-Shimony-Holt (CHSH) Bell parameter of $S = 2.52 \pm 0.17$, violating the CHSH-Bell inequality ($S \le 2$). Our work completes a long-standing objective in quantum atom optics by extending Bell tests from internal quantum variables to the external degrees of freedom of massive particles, opening a new regime for exploring quantum nonlocality in matter waves and for investigating the interplay between quantum mechanics and gravity.
