 These 4 nodes ran continuously in BBN's laboratory from October 2003, then two were deployed at Harvard and Boston University in June 2004, when the network began running continuously across the metro Boston area, 24x7.In year 3, the network expanded to 8 nodes with the addition of an entanglement-based system (derived from work at Boston University) designed for telecom fibers, and a high-speed atmospheric (freespace) link designed and built by the National Institute of Standards and Technology.In year 4, BBN added a second freespace link to the overall network, using nodes created by Qinetiq, and investigated improved QKD protocols and detectors.