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In this paper, we present an efficient implementation method of physicallayer of Y-00 which can support a secure communication and a quantum keydistribution (more generally key expansion) by IMDD(intensity modulation/directdetection) or FSK(frequency shift keying)optical fiber communication network.Although the general proof of the security is not yet given, a brief sketch ofsecurity analysis is shown, which involve an entanglement attack.Comment: SPIE conference on quantum commun. Proc. SPIE no-516

Quantum key disribution with unconditional security for all-optical fiber network