优化时间仓纠缠四夸克态对Collins-Gisin-Linden-Massar-Popescu不等式的增强破坏
Enhanced violation of the Collins-Gisin-Linden-Massar-Popescu inequality with optimized time-bin-entangled ququarts
摘要：
高维量子纠缠之所以引起人们的关注，是因为它使我们能够执行对噪声具有鲁棒性的量子信息任务。为了检验纠缠量子点的非定域性，基于轨道角动量、时间-能量不确定性和频率仓的量子点，提出并证明了Collins-Gisin-Linden-Massar-Popescu（CGLMP）不等式。在这里，我们报告的时间仓纠缠ququququarts的产生和观察。利用平面光波导技术制作的级联延迟马赫-曾德尔干涉仪实现了CGLMP不等式检验的测量，实现了对时间仓纠缠四夸克态的精确、稳定的测量.此外，我们还通过调制泵浦光的强度，得到了一个优化的纠缠态，利用这个纠缠态，我们可以观察到CGLMP不等式检验的理论最大破坏。结果表明，在最大纠缠态中，我们成功地观测到了违反CGLMP不等式的Bell型参数$S_4 = 2.774 \pm 0.025$，在优化纠缠态中，我们观测到了增强的Bell型参数$S_4 = 2.913 \pm 0.023$.
英文摘要：
High-dimensional quantum entanglement is drawing attention because it enables us to perform quantum information tasks that are robust against noises. To test the nonlocality of entangled qudits, the Collins-Gisin-Linden-Massar-Popescu (CGLMP) inequality has been proposed and demonstrated using qudits based on orbital angular momentum, time-energy uncertainty, and frequency bins. Here, we report the generation and observation of time-bin entangled ququarts. We implemented a measurement for the CGLMP inequality test using cascaded delay Mach-Zehnder interferometers fabricated by using planar lightwave circuit technology, with which we achieved a precise and stable measurement for time-bin-entangled ququarts. In addition, we generated an optimized entangled state by modulating the pump pulse intensities, with which we can observe the theoretical maximum violation for the CGLMP inequality test. As a result, we successfully observed a Bell-type parameter $S_4 = 2.774 \pm 0.025$ violating the CGLMP inequality for the maximally entangled state and an enhanced Bell-type parameter $S_4 = 2.913 \pm 0.023$ for the optimized entangled state.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
