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THU: Thursday Contributed Sessions

THU 13: Poster Session: Applications

THU 13.32: Poster

Thursday, September 11, 2025, 16:30–18:30, ZHG Foyer 1. OG

Reducing losses in time multiplexed multi-loop heralded single photon sources — •Zora Kutz, Xavier Barcons Planas, Lasse Wendland, Jasmin Meinecke, and Janik Wolters — Technical University Berlin

In order to achieve quasi-deterministic heralded single photon sources, the probabilistic nature of spontaneous parametric down conversion can be mitigated with time multiplexing. Depending on the time of pulsed pump induced photon-pair generation, measured by the herald, the signal photon can be stored in a switchable fibre delay line until the end of the clock cycle, with single [1] or multiple loops [2]. The advantage of using several fibre storage loops of different lengths, lies in the reduction of necessary round trips. Overall losses scale with the number of round trips and losses at the out- and in-coupling. Increasing the fibre coupling efficiency as well as implementing the multi-loop model will result in a more efficient source. To increase the coupling efficiency, the tip/tilt degree of freedom of the collimator lens was investigated.
[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. 2019

Keywords: single photon source; multiplexing; SPDC