Gaussian Post-selection for Continuous Variable Quantum Cryptography
arXiv:1206.0936 · doi:10.1103/PhysRevA.87.020303
Abstract
We extend the security proof for continuous variable quantum key distribution protocols using post selection to account for arbitrary eavesdropping attacks by employing the concept of an equivalent protocol where the post-selection is implemented as a series of quantum operations including a virtual distillation. We introduce a particular `Gaussian' post selection and demonstrate that the security can be calculated using only experimentally accessible quantities. Finally we explicitly evaluate the performance for the case of a noisy Gaussian channel in the limit of unbounded key length and find improvements over all pre-existing continuous variable protocols in realistic regimes.
4+4 pages. arXiv admin note: substantial text overlap with arXiv:1106.0825
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