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Abstract: We present a protocol for quantum key distribution using discrete modulationof coherent states of light. Information is encoded in the variable phase ofcoherent states which can be chosen from a regular discrete set ranging frombinary to continuous modulation, similar to phase-shift-keying in classicalcommunication. Information is decoded by simultaneous homodyne measurement ofboth quadratures and requires no active choice of basis. The protocol utilizeseither direct or reverse reconciliation, both with and without postselection.We analyze the security of the protocol and show how to enhance it by theoptimal choice of all variable parameters of the quantum signal.



Autor: Denis Sych, Gerd Leuchs

Fuente: https://arxiv.org/







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