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Q: Fachverband Quantenoptik und Photonik

Q 10: Quantum Technologies – Photon Detectors and Sources

Q 10.6: Talk

Monday, March 2, 2026, 18:15–18:30, P 5

Synchronizing the generation of SPDC photons with a storage loop — •Xavier Barcons Planas^1,2, Helen M. Chrzanowski², Siavash Qodratipour², Fuad Haddad^1,3, Zora Kutz^1,3, and Janik Wolters^1,3,4,5 — ¹German Aerospace Center, Berlin, Germany — ²Humboldt-Universität zu Berlin, Berlin, Germany — ³Technische Universität Berlin, Berlin, Germany — ⁴Einstein Center Digital Future, Berlin, Germany — ⁵AQLS UG (haftungsbeschränkt), Berlin, Germany

Heralded spontaneous parametric down-conversion (SPDC) is one of the most mature techniques for producing pure single photons. Despite the probabilistic nature of SPDC photon-pair generation, parallelization of photon creation events through multiplexing can boost the probability of photon generation [1]. In the temporal degree of freedom, a switchable loop storage cavity has been studied [2,3]. Here, we present a monolithic cavity heralded SPDC single-photon source [4] and demonstrate time-multiplexed photon synchronization using a fiber optical storage loop. The achieved low loop roundtrip loss (<12%) and synchronization across 20 time bins result in substantial enhancements in the n-photon synchronized rates, while the multiphoton contamination increases only slightly. This approach is therefore promising for photonic quantum information processing.

[1] E. Meyer-Scott et al., Rev. Sci. Instrum. 91, 041101 (2020)

[2] T. Pittman et al., Phys. Rev. A 66, 042303 (2002)

[3] F. Kaneda et al., Optica 2, 1010 (2015)

[4] X. B. Planas et al., (in preparation)

Keywords: SPDC; single-photon; time multiplexing