Technical Program

Paper Detail

Paper IDP.11.2
Paper Title A Two-way QKD Protocol Outperforming One-way Protocols at Low QBER
Authors Jari Veli Elias Lietzén, Roope Iikanpoika Vehkalahti, Olav Tirkkonen, Aalto University, Finland
Session P.11: Topics in Privacy and Cryptography
Presentation Lecture
Track Cryptography, Security and Privacy
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Abstract Two-way quantum key distribution (QKD) protocols can provide positive secret key rates for considerably higher quantum bit error rates (QBER) than one-way protocols. However, when QBER is low, only modest key rate gains have been achieved. This is one of the major obstacles for using two-way protocols. In this paper we introduce a new two-way QKD protocol which is a step towards overcoming this shortcoming. Under the assumption that the eavesdropper can only perform individual symmetric quantum attacks, our protocol performs quantum key distribution with a secret key rate that is higher than the information theoretical bound limiting the performance of any one-way protocol. This holds true also for very low QBER values.

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2021 IEEE International Symposium on Information Theory

11-16 July 2021 | Melbourne, Victoria, Australia

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