Engineering energy-time entanglement from resonance fluorescence
Abstract
Resonance fluorescence from a coherently driven two-level emitter is a minimal quantum optical field that combines phase coherence with single-photon-level nonlinearity. Here we show that it can be engineered, using only passive linear interferometry, into energy-time entanglement. By injecting resonance fluorescence from a single quantum dot into an asymmetric Mach--Zehnder interferometer operated near destructive interference of the single-photon component, we generate an output field whose coincidence statistics are dominated by the simultaneous two-photon contribution |2> and the temporally separated photon-pair contribution |11>. In a Franson geometry, these two sectors are resolved on the coincidence-delay axis, and both exhibit high-visibility nonlocal interference fringes and violate the Clauser--Horne--Shimony--Holt Bell inequality. Our results reveal a general route for engineering entanglement from resonance fluorescence using passive optics.
Keywords
Cite
@article{arxiv.2603.25341,
title = {Engineering energy-time entanglement from resonance fluorescence},
author = {Jian Wang and Xiu-Bin Liu and Ziqi Zeng and Xu-Jie Wang and Carlos Antón-Solanas and Li Liu and Hanqing Liu and Haiqiao Ni and Zhichuan Niu and Bang Wu and Zhiliang Yuan},
journal= {arXiv preprint arXiv:2603.25341},
year = {2026}
}
Comments
35 pages, 5 figures; incl. Supplementary Information (SI) with 7 SI figures, 1 SI tables;