Hiekkamäki Markus, Fickler Robert
Tampere University, Photonics Laboratory, Physics Unit, Tampere FI-33720, Finland.
Phys Rev Lett. 2021 Mar 26;126(12):123601. doi: 10.1103/PhysRevLett.126.123601.
Two-photon interference is a fundamental quantum optics effect with numerous applications in quantum information science. Here, we study two-photon interference in multiple transverse-spatial modes along a single beam-path. Besides implementing the analog of the Hong-Ou-Mandel interference using a two-dimensional spatial-mode splitter, we extend the scheme to observe coalescence and anticoalescence in different three- and four-dimensional spatial-mode multiports. The operation within spatial modes, along a single beam path, lifts the requirement for interferometric stability and opens up new pathways of implementing linear optical networks for complex quantum information tasks.
双光子干涉是一种基本的量子光学效应，在量子信息科学中有众多应用。在此，我们研究沿单一路径的多个横向空间模式中的双光子干涉。除了使用二维空间模式分束器实现洪-欧-曼德尔干涉的类似物外，我们还扩展了该方案，以观察不同三维和四维空间模式多端口中的合并和反合并现象。沿单一路径在空间模式内的操作消除了对干涉稳定性的要求，并为实现用于复杂量子信息任务的线性光学网络开辟了新途径。
