Scalable generation of heralded single photons via active feed-forward switching of a fiber delay line

• URL: http://arxiv.org/abs/2606.16741v1
• Date: Mon, 15 Jun 2026 14:02:52 GMT
• Title: Scalable generation of heralded single photons via active feed-forward switching of a fiber delay line
• Abstract summary: We show temporal synchronization of multiple photon-generation events using a free-space-fiber hybrid delay line with feed-forward control.<n> Narrow-band, telecom-wavelength photons compatible for fiber transmission are heralded from a monolithic cavity SPDC source and synchronized across 20 time bins.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quasi-deterministic single-photon generation is a key requirement for many photonic quantum technologies. Photon sources based on spontaneous parametric down-conversion (SPDC) are widely used for producing high-quality photons; however, the probabilistic nature of the process limits the generation of synchronized multi-photon states. Here, we demonstrate temporal synchronization of multiple photon-generation events using a free-space-fiber hybrid delay line with feed-forward control, enabling fast and efficient switching and scalable operation. Narrow-band, telecom-wavelength photons compatible for fiber transmission are heralded from a monolithic cavity SPDC source and synchronized across 20 time bins. This yields a sixfold enhancement in synchronized rates and enables multi-photon synchronization, with only a marginal increase of higher-order photon-number contributions.

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