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High-dimensional two-photon interference effects in spatial modes

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arxiv 2006.13288 v3 pith:7LQUA5T6 submitted 2020-06-23 quant-ph physics.optics

classification quant-phphysics.optics
keywords interferencemodesquantumtwo-photonalongbeam-pathimplementinginformation
verification ladder T0 review T1 audit T2 compute T3 formal
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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 analogue of the Hong-Ou-Mandel interference using a two-dimensional spatial-mode splitter, we extend the scheme to observe coalescence and anti-coalescence 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.

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