Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 44: Quantum Information II
Q 44.4: Vortrag
Donnerstag, 14. März 2024, 11:45–12:00, HS 1199
Phase compensation for free space continuous variable quantum key distribution using unscented Kalman filter — •Wenjia Elser1,2, Stefan Richter1,2, and Christoph Marquardt1,2 — 1Max Planck Institute for the Science of Light, Erlangen, Germany — 2Friedrich Alexander University Erlangen-Nürnberg, Germany
Continuous variable quantum key distribution (CV-QKD) is typically conducted in a very low signal to noise ratio (SNR) regime associated with the quantum signal. As a result, the tracking and compensation of laser phase noise is critical to reducing excess noise in the signal. This work concerns the phase compensation of our experiment data over an urban free-space CV-QKD link. Implementing time-division multiplexed reference pulses to provide a sufficiently high SNR reference for laser phase tracking, we apply an unscented Kalman filter (UKF) on the phase estimation and investigate its effect on the quantum signal excess noise.
Keywords: quantum key distribution; free-space CV-QKD; Kalman filter