Polarization Calibration Scheme for a Practical Handheld Free Space Quantum Key Distribution Link
Lai Zhou, David Lowndes, Vincent Lee, Indranil Mitra, Sai Gopal T., John Rarity, Grahame E. Faulkner, Dominic C. O'Brien · 2019
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.