Observation of bunching of two bell states

H. S. Eisenberg*, J. F. Hodelin, G. Khoury, D. Bouwmeester

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The bunching of two single photons on a beam splitter is a fundamental quantum effect, first observed by Hong, Ou, and Mandel. It is a unique interference effect that relies only on the photons' indistinguishability and not on their relative phase. We generalize this effect by demonstrating the bunching of two Bell states, created in two passes of a nonlinear crystal, each composed of two photons. When the two Bell states are indistinguishable, phase-insensitive destructive interference prevents the outcome of fourfold coincidence between the four spatial-polarization modes. For certain combinations of the two Bell states, we demonstrate the opposite effect of antibunching. We relate this result to the number of distinguishable modes in parametric down-conversion.

Original languageAmerican English
Article number160404
JournalPhysical Review Letters
Issue number16
StatePublished - 2006


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