Abstract
Two schemes, via generalized measurement and with entanglement concentration respectively, for controlled dense coding with a four-qubit entangled state are investigated in detail. In the two schemes, the supervisor (Cliff) can control the average amount of information transmitted from the sender (Alice) to the receiver (Bob) by adjusting the local measurement angle θ. It is shown that the results for the average amounts of information are unique from the different two schemes.
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Li, R. Controlled Dense Coding with Four-Qubit Entangled State. Int J Theor Phys 51, 3208–3213 (2012). https://doi.org/10.1007/s10773-012-1201-z
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DOI: https://doi.org/10.1007/s10773-012-1201-z