Abstract
We present a flexible quantum key distribution (QKD) system implementation
using quadrature phase-shift keying (QPSK) encoding. Two detection
techniques are implemented and compared: a photon counting detection scheme
using single photon avalanche diodes (SPAD) and a dual-threshold balanced
homodyne detection (BHD) using standard PIN diodes in which the weak signal
is time-multiplexed with a strong reference. The interferometer instability
and the system phase fluctuations are compensated by an optoelectronic
feedback loop that allows an automatic continuous operation. We compare the
QKD system performance for both schemes in terms of BER and key generation
efficiency. Finally, we analyze the BHD QKD system security under the
potential individual intercept-resend attack and the intermediate-base
attack.
© 2009 IEEE
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