 In the project's first year (year 1), BBN designed and built a full QKD system (Alice and Bob), with an attenuated laser source (~ 0.1 mean photon number) running through telecom fiber, phase-modulated via an actively stabilized Mach-Zender interferometer.BBN also implemented a full suite of industrial-strength QKD protocols based on BB84.In year 2, BBN created two 'Mark 2' versions of this system (4 nodes) with commercial-quality InGaAs detectors created by IBM Research.