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Photon Counting and Super Homodyne Detection of Weak QPSK Signals for Quantum Key Distribution
Q. XU, M. B. Costa e Silva, S. Agnolini +2
We compare the principles and experimental results of two different QPSK signal detection configurations, photon counting and super homodyning, for applications in fiber-optic Quan…
Integrating a QPSK Quantum Key Distribution Link
M. B. Costa e Silva, Q. Xu, S. Agnolini +4
We present the integration of the optical and electronic subsystems of a BB84-QKD fiber link. A highspeed FPGA MODEM generates the random QPSK sequences for a fiber-optic delayed s…
Homodyne QPSK Detection for Quantum Key Distribution
M. B. Costa e Silva, Q. Xu, S. Agnolini +2
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 twoelectro…