Abstract
This work presents two robust quantum secure communication schemes with authentication based on Einstein-Podolsky-Rosen (EPR) pairs, which can withstand collective noises. Two users previously share an identity string representing their identities. The identity string is encoded as decoherence-free states (termed logical qubits), respectively, over the two collective noisy channels, which are used as decoy photons. By using the decoy photons, both the authentication of two users and the detection of eavesdropping were implemented. The use of logical qubits not only guaranteed the high fidelity of exchanged secret message, but also prevented the eavesdroppers to eavesdrop beneath a mask of noise.
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Chang, Y., Zhang, S., Li, J. et al. Robust EPR-pairs-based quantum secure communication with authentication resisting collective noise. Sci. China Phys. Mech. Astron. 57, 1907–1912 (2014). https://doi.org/10.1007/s11433-014-5434-0
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DOI: https://doi.org/10.1007/s11433-014-5434-0