Source monitoring for continuous-variable quantum key distribution
arXiv:1112.4542 · doi:10.1103/PhysRevA.86.042314
Abstract
The noise in optical source needs to be characterized for the security of continuous-variable quantum key distribution (CVQKD). Two feasible schemes, based on either active optical switch or passive beamsplitter are proposed to monitor the variance of source noise, through which, Eve's knowledge can be properly estimated. We derive the security bounds for both schemes against collective attacks in the asymptotic case, and find that the passive scheme performs better.
The first version. 9 pages and 4 figures
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- A modified practical homodyne detector model for continuous-variable quantum key distribution: detailed security analysis and improvement by the phase-sensitive amplifier
- Countermeasure for negative impact of practical source in continuous-variable measurement-device-independent quantum key distribution