Bidirectional Quantum Secure Direct Communication Network Protocol with Hyperentanglement |
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| Authors: | GU Bin HUANG Yu-Gai FANG Xia CHEN Yu-Lin |
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| Institution: | 1.College of Math and Physics, Nanjing University of Information Science and Technology, Nanjing 210044, China;2.The Photonic Technology Lab, Nanjing University of Information Science and Technology, Nanjing 210044, China;3.Jiangsu Institute of Education, Nanjing 210013, China |
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| Abstract: | We propose a bidirectional quantum secure direct communication (QSDC) network protocol with the hyperentanglment in both the spatial-mode ad the polarization degrees of freedom of photon pairs which can in principle be produced with a beta barium borate crystal. The secret message can be encoded on the photon pairs with unitary operations in these two degrees of freedom independently. Compared with other QSDC network protocols, our QSDC network protocol has a higher capacity as each photon pair can carry 4 bits of information. Also, we discuss the security of our QSDC network protocol and its feasibility with current techniques. |
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| Keywords: | quantum secure direct communication network bidirectional hyperentanglement high capacity |
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