Fast Polarization Switch for Polarization-Based Quantum Communication
  We present a complete optoelectronic unit for polarization visualization, switching and control. The system is based on an FPGA unit and comprises: an acquisition unit containing an analog polarimeter and digital-to-analog converters, an FPGA capable of implementing an optimal algorithm for three-stage arbitrary polarization tracking, and an electronic driver with analog-to-digital converters capable of interfacing with Lithium-Niobate-based Polarization Controllers. The results, determined via simulation of real-parameter devices, show that fast polarization switch is achievable. 
Vinicius M. Lima, Felipe Calliari, Joaquim D. Garcia, Jo\~ao Pedro D.   Garcia, Gustavo C. Amaral, Guilherme P. Tempor\~ao, ...
quant-ph