Quantum Key Ditribution Based on Quantum Intensity Correlation of Twin Beams

Details Quantum Key Ditribution Based on Quantum Intensity Correlation of Twin Beams Quantum Key Ditribution Based on Quantum Intensity Correlation of Twin Beams

2005-04-08

arxiv.org/abs/quant-ph/0504059v1

Physics

Quantum Physics

submitted to journal on March 22,2005

Scientific paper

A new and simple quantum key distribution scheme based on the quantum intensity correlation of optical twin beams and the directly local measurements of intensity noise of single optical beam is presented and experimentally demonstrated. Using the twin beams with the quantum intensity correlation of 5dB the effective bit rate of $2\times 10^7bits/s$ is completed. The noncloning of quantum systems and the sensitivity of the existing correlations to losses provide the physical mechamism for the security against eavesdropping. In the presented scheme the signal modulation and homodyne detection are not needed.

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