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Capacity of a Simultaneous Quantum Secure Direct Communication Scheme between the Central Party and Other M Parties |
| GAO Ting1,2; YAN Feng-Li2,3;WANG Zhi-Xi4;LI You-Cheng2,3 |
| 1College of Mathematics and Information Science, Hebei Normal University, Shijiazhuang 050016
2CCAST (World Laboratory), PO Box 8730, Beijing 100080
3College of Physics and Information Engineering, Hebei NormalUniversity, Shijiazhuang 050016
4Department of Mathematics, Capital Normal University, Beijing 100037 |
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| Cite this article: |
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GAO Ting, YAN Feng-Li, WANG Zhi-Xi et al 2006 Chin. Phys. Lett. 23 2656-265 |
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Abstract We analyse the capacity of a simultaneous quantum secure direct communication scheme between the central party and other M parties via M+1-particle GHZ states and swapping quantum entanglement. It is shown that the encoding scheme should be secret if other M parties wants to transmit M+1 bit classical messages to the centre party secretly. However, when the encoding scheme is announced publicly, we prove that the capacity of the scheme in transmitting the secret messages is 2 bits, no matter how large M is.
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| Keywords:
03.67.Hk
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Published: 01 October 2006
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