Homodyne QPSK Detection for Quantum Key Distribution
M. B. Costa e Silva, Qing Xu, S. Agnolini, P. Gallion, Francisco Javier Mendieta · 2006
We present a QKD system with fainted pulses using self-homodyne coherent detection in optical fibers at 1543nm. BB84 protocol key is encoded in the optical phase using a two-electrode Mach-Zehnder modulator, producing a QPSK modulation.