Engineering energy-time entanglement from resonance fluorescence

• URL: http://arxiv.org/abs/2603.25341v1
• Date: Thu, 26 Mar 2026 11:30:54 GMT
• Title: Engineering energy-time entanglement from resonance fluorescence
• Abstract summary: We show that it can be engineered, using only passive linear interferometry, into energy-time entanglement.<n>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.
• Score: 9.99387568613479
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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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