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Q: Fachverband Quantenoptik und Photonik
Q 49: Quantum Communication, Networks, Repeaters, & QKD I
Q 49.4: Talk
Thursday, March 5, 2026, 11:45–12:00, P 10
Characterization of Pulsed Entangled Photon Emission via SFWM in Warm Rubidium Vapors — •Giorgio De Pascalis1, Ioannis Caltzidis1, Ruben Kampel1, Shane Andrewski2, Mael Flament2, Alexander N. Craddok2, Sonja Barkhofen1, Mehdi Namazi2, and Klaus D. Jöns1 — 1Institute for Photonic Quantum Systems (PhoQS), Center for Optoelectronics and Photonics Paderborn (CeOPP) and Department of Physics, Paderborn University, Paderborn, Germany — 2Qunnect Inc, Brooklyn, USA
The development of robust sources capable of reliably emitting entangled photon pairs-compatible with both current communication systems and emerging quantum devices-is of paramount importance for quantum information applications [1,2]. Practical implementations in deployed quantum networks require both high emission rates and high state fidelity. Spontaneous four-wave mixing (SFWM) has emerged as a promising technique to use in a real telecommunication network [3]. Typically, these sources are driven using continuous-wave coupling and pump fields, a configuration that limits the possibility of controlled synchronized quantum network protocols. We present a comprehensive characterization of the source's emission properties, combining theoretical modeling and experimental measurements, including a CHSH measurement and quantum state tomography of the generated entangled photon pairs. [1] Yin, J. et al. Nature 582, 501-505 (2020) [2] Bennett C. H. et al. Phys. Rev. Lett. 68, 557 (1992) [3] M. Sena et al. arXiv: 2504.08927 [quant-ph]
Keywords: Warm Rubidum vapour; Entanglement; Pulsed four wave mixing; Quantum state tomography; Quantum network