@article {eisenberg_observation_2006,
	title = {Observation of Bunching of Two Bell States},
	journal = {Phys. Rev. Lett.},
	volume = {96},
	number = {16},
	year = {2006},
	note = {Publisher: American Physical Society},
	pages = {160404},
	abstract = {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{\textquoteright} 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.},
	doi = {10.1103/PhysRevLett.96.160404},
	url = {https://link.aps.org/doi/10.1103/PhysRevLett.96.160404},
	author = {Eisenberg, H. S. and Hodelin, J. F. and Khoury, G. and Bouwmeester, D.}
}
