Using photonic chips to control single photons in waveguides is a promising route to technologies based on the photons'quantum properties. The ability to measure entanglement on such chips is a key step in that direction.
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Lobino, M., O'Brien, J. Entangled photons on a chip. Nature 469, 43–44 (2011). https://doi.org/10.1038/469043a
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DOI: https://doi.org/10.1038/469043a