Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 62: Poster – Quantum Information Technologies (joint session Q/QI)
Q 62.33: Poster
Thursday, March 13, 2025, 17:00–19:00, Tent
Towards experimental implementation of a free-space continuous-variable quantum key distribution scheme with unidirectional modulation of squeezed states — •Jan Schreck1,2, Thomas Dirmeier1,2, Kevin Jaksch1,2, and Christoph Marquardt2,1 — 1Max Planck Insitute for the Science of Light, Erlangen, Germany — 2Chair of Optical Quantum Technologies, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
Continuous-variable quantum key distribution (CV-QKD) offers a chance to create quantum-safe cryptography. Polarization is a promising degree of freedom to encode QKD signals in free-space optical (FSO) links. Furthermore, a experimental CV-QKD implementation by unidirectional modulation of polarization squeezed states of light can increase CV-QKD's resilience to channel noise and finite post-processing efficiency. In addition, supression of information leakage to potential eavesdroppers is possible. This work presents our idea of a quantum signal source generating squeezed states of light and the concept of the optical sender and receiver.
Keywords: Quantum Key Distribution; Free-Space Optical Communication; Squeezed States