We experimentally observe that quantum duality of a single photon is controlled by its self-entanglement through a three-way quantum coherence identity V2+D2+C2=1. Here V, D, C represent waveness, particleness, and self-entanglement respectively.
@article{arxiv.2001.01749,
title = {Wave-Particle Duality Controlled by Single-Photon Self-Entanglement},
author = {X. -F. Qian and K. Konthasinghe and S. K. Manikandan and D. Spiecker and A. N. Vamivakas and J. H. Eberly},
journal= {arXiv preprint arXiv:2001.01749},
year = {2020}
}