These schematics and pcb layouts have been designed with Express PCB free CAD software. 
Files led_driver_final_*.* correspond to Alice's processing unit and as their names suggest, they drive leds 1-2, 3-4 and generate the clock signal that is sent to Bob for the synchronization and signal demultiplexing.
Files demux_delay.* correspond to Bob's processing unit, and temporally demultiplexes the photon detections, using a temporal mask that has to be provided as an input. 

All theses boards are connected to the corresponding Arduino shields, which can be found in the folder "Arduino Mega shields"