Journal
OPTICS COMMUNICATIONS
Volume 283, Issue 23, Pages 4782-4786Publisher
ELSEVIER
DOI: 10.1016/j.optcom.2010.06.083
Keywords
Quantum steganography; Quantum secure direct communication; Quantum entanglement swapping; Super-dense coding
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Funding
- National Basic Research Program of China (973 Program) [2007CB311203]
- Specialized Research Fund for the Doctoral Program of Higher Education [20070013007]
- National Natural Science Foundation of China [61003287, U0835001, 60821001]
- Fundamental Research Funds for the Central Universities [BUPT2009RC0220]
- 111 Project [B08004]
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In this paper, we propose a novel quantum steganography protocol based on quantum secure direct communication By using entanglement swapping of Bell states, the protocol builds up hidden channel within the Improved ping-pong protocol to transmit secret messages. Comparing with the previous quantum steganographies, its capacity of hidden channel is increased to four times, and the superposition channel can transmit more information than the original quantum channel Imperceptibility of the hidden channel in this protocol is good, since its possibility of detection can be arbitrarily reduced by increasing the Bell state's number. Security of the secret messages is also proved to be reliable regardless of whether the hidden channel has been detected or not In addition, our protocol has various applications in quantum communication (C) 2010 Elsevier B.V. All rights reserved
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