Abstract
The Goldenberg–Vaidman (GV) protocol for quantum key distribution uses orthogonal encoding states of a particle. Its security arises because operations accessible to Eve are insufficient to distinguish the two states encoding the secret bit. We propose a two-particle cryptographic protocol for quantum secure direct communication, wherein orthogonal states encode the secret, and security arises from restricting Eve from accessing any two-particle operations. However, there is a non-trivial difference between the two cases. While the encoding states are perfectly indistinguishable in GV, they are partially distinguishable in the bipartite case, leading to a qualitatively different kind of information-versus-disturbance trade-off and also options for Eve in the two cases.
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Acknowledgments
PY thanks the Raman Research Institute, Bangalore, India for a student fellowship, during which most of this work was completed. AP and RS thank Department of Science and Technology (DST), India, for support provided through projects SR/S2/LOP-0012/2010 and SR/S2/LOP-02/2012, respectively. AP also thanks the Operational Program Education for Competitiveness—European Social Fund project CZ.1.07/2.3.00/20.0017 of the Ministry of Education, Youth and Sports of the Czech Republic.
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Yadav, P., Srikanth, R. & Pathak, A. Two-step orthogonal-state-based protocol of quantum secure direct communication with the help of order-rearrangement technique. Quantum Inf Process 13, 2731–2743 (2014). https://doi.org/10.1007/s11128-014-0825-8
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DOI: https://doi.org/10.1007/s11128-014-0825-8