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Reliable continuous operation, high key generation rates and long exchange distance are essential for a practical Quantum Key Distribution (QKD) system. We report an experimental demonstration of a BB84 QKD one-way system using fainted pulses and a QPSK key format including a time-multiplexed unmodulated carrier reference at Alice's end, and a differential reception at Bob's end [1], in which phase drift and polarization mismatch are two critical impairments to overcome.
© 2007 IEEE
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