Strong correlation of photons, particularly in the single-photon regime, has recently been exploited for various applications in quantum information processing. Existing correlation measurements, however, do not fully characterize multi-photon correlation in a relevant context and may pose limitations in practical situations. We propose a conceptually rigorous, but easy-to-implement, criterion for detecting correlated multi-photon emission out of a quantum optical system, drawn from the context of wavefunction collapse. We illustrate the robustness of our approach against experimental limitations by considering an anharmonic optical system.
@article{arxiv.1003.2212,
title = {Rigorous criterion for characterizing correlated multiphoton emissions},
author = {Hyun-Gue Hong and Hyunchul Nha and Jai-Hyung Lee and Kyungwon An},
journal= {arXiv preprint arXiv:1003.2212},
year = {2015}
}