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Quantum technologies based on the particle nature of a photon has beenprogressed over the last several decades, where the fundamental quantum featureof entanglement has been tested by Hong-Ou-Mandel (HOM) type anticorrelation aswell as Bell-type nonlocal correlation. Mutually exclusive quantum natures ofthe wave-particle duality of a single photon have been intensively investigatedto understand the fundamental physics of mysterious quantum nature. Here, werevisit the HOM-type quantum correlation to answer the question whether theHOM-type anticorrelation can be a test tool for quantum entanglement. For this,a pair of spontaneous parametric down converted photons is tested for theanticorrelation of HOM effects, where the SPDC-generated photon pair is not inan entangled state.

Can Hong-Ou-Mandel type quantum correlation be a test tool for quantum entanglement?