Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 67: Poster – Quantum Information
Q 67.19: Poster
Thursday, March 5, 2026, 17:00–19:00, Philo 2. OG
Implementation of unidirectional modulation of polarization squeezed states for an experimental free-space continuous-variable quantum key distribution scheme — •Jan Schreck1,2, Kevin Jaksch1,2, Thomas Dirmeier1,2, Hüseyin Vural1,2, and Christoph Marquardt2,1 — 1Max Planck Institute for the Science of Light, Staudtstr. 2, Erlangen, Germany — 2Chair of Optical Quantum Technologies, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstr. 7 / A3, Erlangen
Continuous-variable quantum key distribution (CV-QKD) provides a pathway toward quantum-safe cryptography. Polarization is a promising degree of freedom for encoding QKD signals in free-space optical (FSO) channels. In this context, the unidirectional modulation of polarization-squeezed states of light constitutes an experimental CV-QKD scheme that may enhance robustness against channel noise and limitations in post-processing efficiency. In this work, we present our approach to generating squeezed states of light as the source of quantum signals, and describe the corresponding sender and receiver setups for information transfer. Experimental characterization of the encoding concept based on electro-optical modulation is reported, indicating the feasibility of QKD with our implementation.
Keywords: Quantum Key Distribution; Squeezed States of Light; Free Space Optical Communication