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The photon's frequency degree of freedom, being compatible with mature telecom infrastructure, offers large potential for the stable and controllable realization of photonic quantum processing applications such as the quantum internet. The Hong–Ou–Mandel effect, as a two‐photon interference phenomenon, serves as a central building block for such frameworks. A key element yet missing to enable meaningful...
The cover illustrates spectral two‐photon Hong‐Ou‐Mandel interference between independent photon sources, as demonstrated in article number 2000464 by Anahita Khodadad Kashi and Michael Kues, central to realizing future large‐scale quantum networks. Pairs of pure photons of different colors superimpose at an electro‐optic frequency mixer (depicted by the bright white element) and coalesce in either...
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