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Engineering energy-time entanglement from resonance fluorescence

arXiv
Authors: Jian Wang, Xiu-Bin Liu, Ziqi Zeng, Xu-Jie Wang, Carlos Antón-Solanas, Li Liu, Hanqing Liu, Haiqiao Ni, Zhichuan Niu, Bang Wu, Zhiliang Yuan

Year

2026

Paper ID

35662

Status

Preprint

Abstract Read

~2 min

Abstract Words

121

Citations

N/A

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.

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  • This paper contributes to the Quantum Foundations research area in the Quantum Articles archive.
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  • Resonance fluorescence from a coherently driven two-level emitter is a minimal quantum optical field that combines phase coherence with single-photon-level nonlinearity.

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