标题： 量子非局域双缝相干性与部分相干量子比特的干涉 显示英文标题

标题： Quantum nonlocal double slit interference with partially coherent qubits

摘要： 部分相干量子纠缠光束结合了量子纠缠与部分相干性，使其在保持量子特性的同时，更能抵抗传播过程中随机介质引起的畸变。 本研究探讨了此类光束相干性变化对非局域双缝量子干涉的影响。 通过控制自发参量下转换过程中高斯-谢尔模型泵浦光的光斑尺寸和横向相干长度，实现了空间相干性的变化。 对于固定光束尺寸，部分相干双光子的动量关联宽度随着横向相干长度的减小而增加。 这导致双光子束表现出多种空间模式，使其更适合于研究成像、干涉和衍射实验中量子态的非局域特性。 我们的研究结果显示，即使泵浦光的相干性大幅降低，利用部分相干孪生光束仍能实现高质量且接近1的非局域干涉可见度。 我们相信这些结果能够增强光束在传播过程中对抗介质不利影响的鲁棒性，并可能在光学图像加密、生物医学成像、量子光刻和量子全息等领域具有潜在应用价值。 显示英文摘要

摘要： Partially coherent quantum-entangled beams combine quantum entanglement with partial coherence, allowing them to maintain quantum characteristics while being more resistant to distortions caused by random media during propagation. In this study, we investigate the effect of coherence variation of such beams on non-local double-slit quantum interference. The spatial coherence variation is achieved by controlling the spot size and transverse coherence length of the Gaussian Schell model pump in the spontaneous parametric down conversion process. For a fixed beam size, the momentum correlation width of partially coherent biphotons increases with the decreases in the transverse coherence length. This results in a biphoton beam exhibiting multiple spatial modes, making it more suitable for studying the non-local features of quantum states in imaging, interference, and diffraction experiments. Our findings infer both high-quality and near-unity visibility of nonlocal interference using the partially coherent twin beams, even with the substantial decrease in the coherence of the pump. We believe these results can enhance robustness against the deleterious effects of the medium during propagation and can have potential applications in optical image cryptography, biomedical imaging, quantum lithography, and quantum holography.