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Conference Paper

Quantum Key Distribution with Multi Letter Continuous Variable Alphabets

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

/persons/resource/persons201115

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

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Citation

Sych, D., & Leuchs, G. (2009). Quantum Key Distribution with Multi Letter Continuous Variable Alphabets. In QUANTUM COMMUNICATION, MEASUREMENT AND COMPUTING (QCMC) (pp. 347-350). 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA: AMER INST PHYSICS.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-6C3D-0
Abstract
We present a new protocol for continuous variable quantum key distribution. 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 protocol, especially in the case when losses in the communication channel are low.