Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.100502
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Funding
- LUH [GRK 1463]
- DFG [WE-1240/12-1, CH 843/1-1, CH 843/2-1]
- BMBF project QuOReP
- EU project Q-ESSENCE
- research cluster QUEST
- SNF through National Centre of Competence in Research Quantum Science and Technology''
- SNF [PP00P2-128455]
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We provide a security analysis for continuous variable quantum key distribution protocols based on the transmission of two-mode squeezed vacuum states measured via homodyne detection. We employ a version of the entropic uncertainty relation for smooth entropies to give a lower bound on the number of secret bits which can be extracted from a finite number of runs of the protocol. This bound is valid under general coherent attacks, and gives rise to keys which are composably secure. For comparison, we also give a lower bound valid under the assumption of collective attacks. For both scenarios, we find positive key rates using experimental parameters reachable today.
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