Homodyne QPSK Detection for Quantum Key Distribution

Abstract

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 twoelectrode Mach-Zehnder modulator, producing a QPSK modulation.

3 pages, 4 figures, COTA/OSA Conference, Whistler, British Columbia, Canada, June 2006 2006