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Photonic Quantum Computing

In-Situ Measurement of Beam Divergence in a High Efficiency SNSPD Platform

arXiv
Authors: Daniel W. Sorensen, Martin J. Stevens, Lynden K. Shalm, Dileep V. Reddy

Year

2026

Paper ID

60680

Status

Preprint

Abstract Read

~2 min

Abstract Words

100

Citations

0

Abstract

We implement a time-of-flight imaging technique utilizing a differential-readout SNSPD to spatially resolve detection events in a fiber-coupled detector platform. We measure the spatial detection profiles for ultra-high numerical aperture fiber, standard single-mode fiber, and thermally-expanded core fiber (mode-field diameters 4.1μm, 10.4μm, 30μm respectively) in an active area surrounded by an all-dielectric optical stack designed for near-unity detection efficiency. We see no beam divergence in all but the smallest fiber optic modes. This contradicts previously-held beliefs that beam divergence during the detection process necessitates activate areas much larger than coupled optical modes, opening new paths toward smaller and better-optimized detectors.

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  • This paper contributes to the Photonic Quantum Computing research area in the Quantum Articles archive.
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  • We implement a time-of-flight imaging technique utilizing a differential-readout SNSPD to spatially resolve detection events in a fiber-coupled detector platform.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2605.08425 [2] arXiv https://arxiv.org/abs/2605.08425 [3] Publisher https://arxiv.org/abs/2605.08425

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