The Hong-Ou-Mandel effect is really odd
Paul M. Alsing, Richard J. Birrittella, Christopher C. Gerry, Jihane Mimih, P. L. Knight · Quantum 2.0 Conference and Exhibition · 2022
We show that any odd parity state entering one input port of a 50:50 beam splitter, with an arbitrary state entering the other input port, produces zero coincidence counts. This result extends the HOM effect.