A Two-way QKD Protocol Outperforming One-way Protocols at Low QBER

Jari Lietzen, Roope Vehkalahti, Olav Tirkkonen

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

4 Citations (Scopus)
119 Downloads (Pure)


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.

Original languageEnglish
Title of host publication2020 IEEE International Symposium on Information Theory, ISIT 2020 - Proceedings
Number of pages6
ISBN (Electronic)9781728164328
Publication statusPublished - Jun 2020
MoE publication typeA4 Conference publication
EventIEEE International Symposium on Information Theory - Los Angeles, United States
Duration: 21 Jul 202026 Jul 2020

Publication series

NameIEEE International Symposium on Information Theory
ISSN (Print)2157-8095
ISSN (Electronic)2157-8117


ConferenceIEEE International Symposium on Information Theory
Abbreviated titleISIT
Country/TerritoryUnited States
CityLos Angeles


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