L. Zhou et al., “Polarization Calibration Scheme for a Practical Handheld Free Space Quantum Key Distribution Link,” 2019 IEEE Globecom Workshops (GC Wkshps), Waikoloa, HI, USA, 2019, pp. 1-5, doi: 10.1109/GCWkshps45667.2019.9024509.
Free space Quantum Key Distribution (QKD) links between terminals that move relative to each other pose a number of challenges. The beam-steering components (typically mirrors) and the relative movement lead to variable birefringence, and for particular configuration there will also be fixed birefringence. The paper proposes a polarization calibration scheme suitable for real-time operation. Simulation and experiment are performed to verify the proposed scheme.