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Experimental realization of the analogy of quantum dense coding in classical optics
T. Schaetz, M. D. Barrett, D. Leibfried, J. Chiaverini, J. Britton, W. M. Itano, J. D. Jost, C. Langer, and D. J. Wineland, Phys. Rev. Lett. 93, 040505 (2004).
G. Milione, T. A. Nguyen, J. Leach, D. A. Nolan, and R. Alfano, Opt. Lett. 40, 4887 (2015) also in Frontiers in Optics 2013, I. Kang, D. Reitze, N. Alic, and D. Hagan eds., OSA Technical Digest (online) (Optical Society of America, 2013), paper FM3F.4.
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We report on the experimental realization of the analogy of quantum dense coding in classical optical communication using classical optical correlations. Compared to quantum dense coding that uses pairs of photons entangled in polarization, we find that the proposed design exhibits many advantages. Considering that it is convenient to realize in optical communication, the attainable channel capacity in the experiment for dense coding can reach 2 bits, which is higher than that of the usual quantum coding capacity (1.585 bits). This increased channel capacity has been proven experimentally by transmitting ASCII characters in 12 quaternary digitals instead of the usual 24 bits.
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