Kak’s three-stage protocol of secure quantum communication revisited: hitherto unknown strengths and weaknesses of the protocol

@article{Thapliyal2018KaksTP,
  title={Kak’s three-stage protocol of secure quantum communication revisited: hitherto unknown strengths and weaknesses of the protocol},
  author={Kishore Thapliyal and Anirban Pathak},
  journal={Quantum Information Processing},
  year={2018},
  volume={17},
  pages={1-18}
}
Kak’s three-stage protocol for quantum key distribution is revisited with special focus on its hitherto unknown strengths and weaknesses. It is shown that this protocol can be used for secure direct quantum communication. Further, the implementability of this protocol in the realistic situation is analyzed by considering various Markovian noise models. It is found that the Kak’s protocol and its variants in their original form can be implemented only in a restricted class of noisy channels… 

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