We report a 4-photon measurement in silicon-on-isolator, demonstrating 67.31% ± 10% indistinguishability among heralded photons generated from two separate micro-resonators, and interfered on-chip. The heralded single-photon purities from each source are estimated as 86.20 ± 3.89% and 78.69 ± 2.44%.

© 2017 Optical Society of America

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