Free-space quantum key distribution
  A working free-space quantum key distribution (QKD) system has been developed and tested over a 205-m indoor optical path at Los Alamos National Laboratory under fluorescent lighting conditions. Results show that free-space QKD can provide secure real-time key distribution between parties who have a need to communicate secretly. 
W. T. Buttler, R. J. Hughes, P. G. Kwiat, G. G. Luther, G. L. Morgan,   J. E. Nordholt, C. G. Peterson, and C. M. Simmons