期刊
PHYSICAL REVIEW A
卷 86, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.86.032309
关键词
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资金
- French National Research Agency, through the FREQUENCY project [ANR-09-BLAN-0410]
- French National Research Agency, through the HIPERCOM project [2011-CHRI-006]
- European Union through the project Q-CERT [FP7-PEOPLE-2009-IAPP]
- Agence Nationale de la Recherche et de la Technologie
- Swiss National Science Foundation through the National Centre of Competence in Research Quantum Science and Technology
As quantum key distribution becomes a mature technology, it appears clearly that some assumptions made in the security proofs cannot be justified in practical implementations. This might open the door to possible side-channel attacks. We examine several discrepancies between theoretical models and experimental setups in the case of continuous-variable quantum key distribution. We study in particular the impact of an imperfect modulation on the security of Gaussian protocols and show that approximating the theoretical Gaussian modulation with a discrete one is sufficient in practice. We also address the issue of properly calibrating the detection setup and in particular the value of the shot noise. Finally, we consider the influence of phase noise in the preparation stage of the protocol and argue that taking this noise into account can improve the secret key rate because this source of noise is not controlled by the eavesdropper.
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