Security of continuous-variable quantum cryptography with Gaussian postselection

Nathan Walk*, Timothy C. Ralph, Thomas Symul, Ping Koy Lam

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    65 Citations (Scopus)

    Abstract

    We extend the security analysis of continuous variable quantum-key- distribution protocols using a family of post selection schemes to account for arbitrary eavesdropping attacks. We show that the postselection protocol is equivalent to a virtual entanglement-based protocol including a distillation stage. 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.

    Original languageEnglish
    Article number020303
    JournalPhysical Review A - Atomic, Molecular, and Optical Physics
    Volume87
    Issue number2
    DOIs
    Publication statusPublished - 21 Feb 2013

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