Quantum key distribution with multi letter alphabets |
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Authors: | D Sych and G Leuchs |
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Institution: | 1.Max Planck Institute for the Science of Light,Erlangen,Germany |
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Abstract: | We present a new protocol for continuous variable quantum key distribution (CV QKD). The novelty of the protocol is a multi
letter alphabet represented by coherent states of light with a fixed amplitude and variable phase. Information is encoded
in the phase of a coherent state which can be chosen from a regular discrete set consisting, however, of an arbitrary number
of letters. We evaluate the security of the protocol against the beam splitting attack. As a result we show the proposed protocol
has advantages over the standard two letter coherent state QKD protocol, especially in the case when losses in the communication
channel are low. |
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Keywords: | |
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