Finite size analysis of measurement device independent quantum cryptography with continuous variables

2017/07/31 by Panagiotis Papanastasiou, Carlo Ottaviani, Stefano Pirandola · 1 citation
Physics and Astronomy · #quant-ph

paper · pdf · doi:10.1103/physreva.96.042332

published as Physical Review A 96, 042332 (2017) · 10 pages, 3 figures, typos corrected, abstract and intro modified, references added

arxiv created 2017/09/11 · arxiv updated 2017/10/25

Abstract

We study the impact of finite-size effects on the key rate of continuous-variable (CV) measurement-device-independent (MDI) quantum key distribution (QKD). Inspired by the parameter estimation technique developed in [Rupert et al. Phys. Rev. A 90, 062310 (2014)]~we adapt it to study CV-MDI-QKD and, assuming realistic experimental conditions, we analyze the impact of finite-size effects on the key rate. We find that, increasing the block-size, the performance of the protocol converges towards the ideal one, and that block-sizes between 10⁶ and 10⁹ data points can already provide a key rate ∼10^-2 bit/use over metropolitan distances.

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• Continuous-variables quantum cryptography: asymptotic and finite-size security analysis

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