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To reduce the influence of random channel polarization variation, especiallyfast polarization perturbation,for continuous-variable quantum key distribution(CV-QKD) systems, a simple and fast polarization tracking algorithm is proposedand experimentally demonstrated. The algorithm is implemented by an orthogonalpilot tone scheme, one of the pilot tones is used for estimating thepolarization rotation angle, and the other one is used for compensating thepolarization perturbation introduced phase noise. Meanwhile, residual effectsare compensated precisely with the help of a real-valued FIR filter. In thiscase, the excess noise introduced by polarization perturbation is effectivelysuppressed. Experimental results show that the polarization scrambling rate12.57 krad/s can be tracked by using the proposed algorithm, and a goodestimated parameters performance is achieved. Compared to conventionalpolarization tracking algorithms such as the constant modulus algorithm (CMA),experimental results show that the polarization tracking apability of theproposed algorithm is significantly improved. Furthermore, much fasterpolarization tracking performance is evaluated by digital simulations, and thesimulation results show that about 188.50 Mrad/s can be tracked by the proposedalgorithm. Thus, our method provides effective technology for the practicalapplication of fiber-based CV-QKD.

Simple and Fast Polarization Tracking algorithm for Continuous-Variable Quantum Key Distribution System Using Orthogonal Pilot Tone