Quantum secure direct communication with optimal quantum superdense coding by using general four-qubit states

  • Authors:

  • Zhihao Liu;Hanwu Chen;Wenjie Liu;Juan Xu;Dong Wang;Zhiqiang Li

  • Affiliations:

  • School of Computer Science and Engineering, Southeast University, Nanjing, China 211189;School of Computer Science and Engineering, Southeast University, Nanjing, China 211189;School of Computer and Software, Nanjing University of Information Science & Technology, Nanjing, China 210044;School of Computer Science and Engineering, Southeast University, Nanjing, China 211189;Institute of Complex Intelligent Network System, Henan University, Kaifeng, China 475004;College of Information Engineering, Yangzhou University, Yangzhou, China 225009

  • Venue:
  • Quantum Information Processing
  • Year:
  • 2013

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Abstract

From the perspective of quantum circuit, a construction framework and a measurement framework of a general kind of four-qubit states are sketched, respectively. By utilizing the properties of this kind of states, a quantum secure direct communication (QSDC) protocol is put forward, which adopts the idea of optimal quantum superdense coding to achieve a maximal efficiency and high resources capacity. The security of the proposed protocol is discussed in detail and it is proved to be secure theoretically. Moreover, the sufficient and necessary condition of which multipartite states are suitable for optimal quantum superdense coding in quantum secure direct communication is figured out.