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Q: Fachverband Quantenoptik und Photonik

Q 29: Poster – Quantum Technologies I

Q 29.20: Poster

Tuesday, March 3, 2026, 17:00–19:00, Philo 2. OG

Optimising time multiplexed multi-loop heralded single photon sources — •Zora Kutz^1,2,3, Xavier Barcons Planas^1,2,3, Lasse Wendland¹, Jasmin Meinecke¹, and Janik Wolters^1,2,3 — ¹Technische Universität Berlin — ²Deutsches Zentrum für Luft und Raumfahrt — ³Physikalisch-Technische Bundesanstalt

To achieve quasi-deterministic heralded single-photon sources, the probabilistic nature of spontaneous parametric down conversion can be mitigated with time-multiplexing. At the event of a photon-pair generation, the signal photon is stored in a switchable fibre delay line of single [1] or multiple loops [2] until release. Photons can be spaced at regular intervals for later use in computing applications. Implementing storage loops of different lengths reduces the amount of necessary round trips and thus also overall losses. A setup applicable for single or multi-loop usage was realised. For further optimisation, the effect of tip/tilt degree of freedom of a collimator lens on a single mode gaussian beam was investigated in its regard to mode matching.

[1] T. B. Pittman, B. C. Jacobs, und J. D. Franson,Phys. Rev. A, Bd. 66, Nr. 4, S. 042303, Okt. 2002

[2] E. Lee, S. M. Lee, und H. S. Park, Opt. Express, Bd. 27, Nr. 17, S. 24545, Aug. 20192

Keywords: SPDC; time multiplexing; feed-forward; optical switch; mode matching