  State-of-the-art technology for pulse counter electronics offers an important
range of commercial devices, but such systems are usually expensive due to the
complex logic used for this task. The use of counting electronics in
conjunction with photon counters can be used, for example, to perform
experimental tests in Quantum Optics and Quantum Information Science. Here, we
present the development and implementation of a low cost module for multiphoton
coincidence statistics with detection windows of a few nanoseconds. The module
consists of an array of logic gates, with a frequency operation of 250 MHz that
corrects and amplifies the detectors signal. The device characterisation was
done by means of detection of Transistor-Transistor Logic (TTL) signals
retrieved from a signal generator, and implemented in an optical setup. The
detected output signals (TTL pulses) were analysed and stored in a computer by
means of a Field Programmable Gate Array (FPGA). Our module incorporates
fundamental electronics that is currently used in the first experimental
proof-of-principle tests in quantum information and molecular spectroscopy at
CIBioFi.
