Abstract
We present a high-capacity quantum secure direct communication (QSDC) protocol with single photons in both the polarization and the spatial-mode degrees of freedom. With a single photon traveling forth and back from the receiver to the sender, it can carry 2 bits of information as the sender can encode his message on both the polarization states and the spatial-mode states of single photons independently. Moreover, our QSDC protocol is feasible as the preparation and the measurement of a single-photon quantum state in both the polarization and the spatial-mode degrees of freedom is not difficult with current technology.
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Acknowledgement
This work is supported by the Fundamental Research Funds for the Central Universities under Grant No. DC120101184.
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Liu, D., Chen, JL. & Jiang, W. High-Capacity Quantum Secure Direct Communication with Single Photons in Both Polarization and Spatial-Mode Degrees of Freedom. Int J Theor Phys 51, 2923–2929 (2012). https://doi.org/10.1007/s10773-012-1171-1
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DOI: https://doi.org/10.1007/s10773-012-1171-1