High-efficiency detectors capable of single photon detection are one of the key technologies required for adoption of QKD technology. These detection systems need to be made more robust, to be offered at lower cost, and to move out of the laboratory to provide ubiquitous commercial access. Freedom Photonics will develop a highly integrated and compact single photon avalanche photodetector with polarization or phase-shift key photonics, readout and control electronics. This device will be assembled in a telecommunications grade package. These will have high efficiency >85%, low insertion loss near 0 dB, and low dark counts. The package volume will be reduced by >50,000x from the current benchtop solution.
