Abstract
This paper addresses two important problems of interest for deep-space
optical communications, quantum inter-chip/intra-chip optical communications
and quantum-key distribution: 1) the problem of coded $M$-ary phase-shift keying optical coherent-state
quantum communication in the absence of background radiation, and 2) the problem
of coded binary coherent state communication in the presence of background
radiation. In both cases large girth low-density parity-check (LDPC) codes
are used as channel codes. With girth-10 LDPC-code of rate 0.8 and BPSK, the
bit-error ratio of $10^{-
8}$ can be achieved for average number of signal photons of
0.73, resulting in net-effective coding gain of 7.63 dB.
© 2009 IEEE
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