SAMOP 2021 – scientific programme

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QI: Fachverband Quanteninformation

QI 11: Quantum Communication

QI 11.1: Invited Talk

Thursday, September 23, 2021, 14:00–14:30, H4

Numerical Security Analyis for Quantum Key Distribution and Application to Optical Protocols — •Norbert Lütkenhaus — Institute for Quantum Computing, University of Waterloo, Canada

The security analysis of Quantum Key Distribution (QKD) protocols reveals the achievable secrete key rate as a function of observable parameters, such as loss and noise parameters. Calculating the secret key rate is equivalent to solving a convex optimization problem. While for highly symmetric protocols that optimization protocol can be solved analytically, in general it is of advantage to resort to numerical approaches.

We will review the progress of this research agenda accessible to a broader audience to show how researchers with different backgrounds can contribute. The resulting toolbox is available as open source code [1]. I will show some applications, including finite size analysis and the use for optical protocols, such as the Discrete Modulated Continuous Variable QKD protocol. Our approach also allows the evaluation of side-channels that result from device imperfections, including a tight analysis of combinations of such imperfections.

[1] https://openqkdsecurity.org