Quantum key agreement protocol based on BB84

Song Kong Chong, Tzonelih Hwang

Research output: Contribution to journalArticlepeer-review

128 Citations (Scopus)


This work presents a quantum key agreement (QKA) based on the BB84 protocol. The newly proposed QKA protocol enables two involved parties to jointly establish a shared secret key in such a way that the shared secret key cannot be fully determined by one party alone. In contrast to the traditional key agreement protocols that must be based on some mathematical difficulties, the security of the newly proposed protocol is based on the quantum phenomena, which allows unconditional security as well as detection of eavesdroppers. With the technique of delayed measurement, the proposed protocol has 50% qubit efficiency. Therefore, it is very efficient and feasible for practical applications.

Original languageEnglish
Pages (from-to)1192-1195
Number of pages4
JournalOptics Communications
Issue number6
Publication statusPublished - 2010 Mar 15

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering


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