Multiphoton pulses and homodyne tomography attack in quantum-chaotic key distribution
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The quantum-chaotic key distribution (QCKD) in optical networks was introduced in a recent paper. In that work, several differences between QKD and QCKD were pointed out. In this direction, the present work shows that, for a eavesdropper that uses a quantum homodyne attack, the mean photon number used by Alice in the QCKD protocol can be much larger than 0.1 without compromising its security.
KeywordsQuantum key distribution Homodyne tomography Security analysis
This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001, and CNPq via Grant No. 307184/2018-8. Also, this work was performed as part of the Brazilian National Institute of Science and Technology for Quantum Information. The authors gratefully acknowledge many helpful discussions with Jonas Söderholm of Federal University of Ceara.
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