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Quantum key distribution with multi letter alphabets

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Sych,  D.
Optics Theory Group, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201115

Leuchs,  G.
Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Sych, D., & Leuchs, G. (2010). Quantum key distribution with multi letter alphabets. OPTICS AND SPECTROSCOPY, 108(3), 326-330. doi:10.1134/S0030400X10030021.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-6B23-0
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.