  High-speed polarization management is highly desirable for many applications,
such as remote sensing, telecommunication, and medical diagnosis. However, most
of the approaches for polarization management rely on bulky optical components
that are slow to respond, cumbersome to use, and sometimes with high drive
voltages. Here, we overcome these limitations by harnessing photonic integrated
circuits based on thin-film lithium niobate platform. We successfully realize a
portfolio of thin-film lithium niobate devices for essential polarization
management functionalities, including arbitrary polarization generation, fast
polarization measurement, polarization scrambling, and automatic polarization
control. The present devices feature ultra-fast control speed, low drive
voltages, low optical losses and compact footprints. Using these devices, we
achieve high fidelity polarization generation with a polarization extinction
ratio up to 41.9 dB, fast polarization scrambling with a scrambling rate up to
65 Mrad/s, and endless polarization control with a tracking speed up to 10
Krad/s, all of which are best results in integrated optics. The demonstrated
devices unlock a drastically new level of performance and scales in
polarization management devices, leading to a paradigm shift in polarization
management.
