Quantum 2025 – scientific programme

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MON: Monday Contributed Sessions

MON 17: Quantum Communication and Networks: Theory

MON 17.4: Talk

Monday, September 8, 2025, 17:15–17:30, ZHG006

Quantum Conference Key Agreeement with Pre-shared Basis Choice — •Yien Liang, Anton Trushechkin, Hermann Kampermann, and Dagmar Bruß — Institut für Theoretische Physik III, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, 40225 Düsseldorf, Germany

Quantum conference key agreement is a quantum protocol that distributes a secret key among more than two parties. The participants of the protocol share an entangled quantum state and they measure it in the same basis to obatin the secret key. However, as the number of parties increases, the probability of all participants independently randomly choosing the same basis decreases exponentially. In previous literature, key pre-sharing is mentioned as a possible solution to increase the output of the protocol: here, the participants share a secret basis choice. However, no details were given about how to perform basis pre-sharing. In our work, we show how we can securely perform practical basis-sharing without introducing loopholes in the security proof.

Keywords: Quantum Key Distribution; Quantum Cryptography