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A Quantum Network System of QSS-QDC Using χ-Type Entangled States |
| Chang Ho Hong1, 2,Jin O Heo1, 2,Jong in Lim1, 2,Hyung jin Yang1, 2, 3** |
1Graduate School of Information Management and Security, Korea University, Sungbuk-gu Anam 5-ga, Seoul, South Korea
2Center for Information Security Technologies (CIST), Korea University, Seoul, South Korea
3Department of Physics, Korea University, Chochiwon, Choongnam, South Korea |
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| Cite this article: |
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Chang Ho Hong, Jin O Heo, Jong in Lim et al 2012 Chin. Phys. Lett. 29 050303 |
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Abstract A multiuser 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, and therefore only N quantum lines are necessary for 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 is then analyzed.
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| Keywords:
03.67.Hk
03.67.Dd
03.67.Ac
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Received: 16 January 2012
Published: 30 April 2012
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| PACS: |
03.67.Hk
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(Quantum communication)
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03.67.Dd
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(Quantum cryptography and communication security)
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03.67.Ac
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(Quantum algorithms, protocols, and simulations)
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