Multi-user quantum network system and quantum communication using χ-type entangled states

Chang Ho Hong, Jin O. Heo, Jong In Lim, Hyung Jin Yang

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


A multi-user quantum direct communication network system for N users utilizing χ-type entangled states is proposed. The network system is composed of a communication center, N users, and N quantum lines linking the center and the N users. There is no quantum line among users; therefore, only N quantum lines are necessary for the communication between users. Using one χ-type entangled state, in this protocol, we are able to send two bits of information through direct communication and, at the same time, share two bits of quantum keys. The security of the protocol will be analyzed.

Original languageEnglish
Pages (from-to)1-5
Number of pages5
JournalJournal of the Korean Physical Society
Issue number1
Publication statusPublished - 2012 Jul

Bibliographical note

Funding Information:
This research was supported by the MKE (The Ministry of Knowledge Economy), Korea, under the ITRC (Information Technology Research Center) support program (NIPA-2012-H0301-12-3007) supervised by the NIPA (National IT Industry Promotion Agency).


  • Quantum communication network
  • Quantum direct communication
  • Quantum key distribution
  • χ-type entangled state

ASJC Scopus subject areas

  • General Physics and Astronomy


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