发表机构
University of Stuttgart; Ruhr University Bochum（斯图加特大学; 波鸿鲁尔大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文研究半导体量子点级联发射中第二光子的Hong-Ou-Mandel干涉限制，证明其源于时间重叠减少，并通过发射后同步恢复最大干涉可见度，为量子网络提供解决方案。
AI 中文摘要
半导体量子点等量子发射器可以从级联态系统发射纠缠光子对。然而，研究表明，三能级阶梯系统中两个光子之间的时间相关性对可实现的双光子干涉设置了限制。在这项工作中，我们证明这种限制对于第二跃迁发射的光子而言，仅源于干涉分束器处时间重叠的减少。我们通过确定两个连续发射光子对之间的时间分辨四光子符合，从理论和实验上对此进行了研究。发射后同步显示了最大干涉可见度的恢复；在未来的量子网络中，这可以通过确定性量子存储器实现。
英文摘要
Quantum emitters such as semiconductor quantum dots can provide entangled photon pairs emitting from a system of cascaded states. However, the resulting temporal correlation between the two photons from the three-level ladder system has been shown to set a limit on the achievable two-photon interference. In this work, we show that such limitation, for photons emitted by the second transition, is only due to reduced temporal overlap at the interference beam splitter. We investigate this theoretically and experimentally by determining time-resolved four-photon coincidences between two successively emitted photon pairs. Post-emission synchronization shows the recovery of maximum interference visibility; in prospective quantum networks this could be achieved via deterministic quantum memories.
