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Q: Fachverband Quantenoptik und Photonik

Q 49: Quantum Communication, Networks, Repeaters, & QKD I

Q 49.8: Talk

Thursday, March 5, 2026, 12:45–13:00, P 10

Non classicality in frequency multiplexed quantum networks — •Theresa Keuter, Patrick Folge, Abhinandan Bhattacharjee, Benjamin Brecht, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute for Photonics Quantum Systems (PhoQS), Warburger Str. 100

Linear optical quantum networks are a key building block for many quantum technologies, such as Gaussian Boson Sampling. However, previous implementations based on spatial encoding are difficult to scale. We propose a new system, which operates on modes of different frequencies. By employing a dispersion-engineered sum-frequency generation (SFG) process, interactions between these frequency modes can be mediated, enabling a fully programmable, frequency-encoded quantum network within a single spatial and polarization mode. Quantum input states for this network are provided by the strong frequency entanglement of a type-0 parametric down-conversion (PDC) source. In this work, we investigate signatures of non-classicality in such systems as an essential step toward assessing their quantum properties.

Keywords: Nonlinear optics; Quantum networks; Frequency conversion; Frequency multiplexing