When a one-photon state is mixed with a (separate) weak coherent state at a beamsplitter the probability for detecting one photon in each beamsplitter output approaches zero due to destructive interference. We demonstrate this non-classical interference effect using pulse-gated single photons and weak mode-locked laser pulses.
@article{arxiv.quant-ph/9702032,
title = {Non-classical interference between independent sources},
author = {J G Rarity and P R Tapster and R Loudon},
journal= {arXiv preprint arXiv:quant-ph/9702032},
year = {2008}
}