Abstract
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.
Highlights
During the past two decades, significant efforts have been devoted to the study on the quantum information and communication, and a series of important progress has been made
We report on the experimental realization of the analogy of quantum dense coding in classical optical communication using classical optical correlations
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)
Summary
During the past two decades, significant efforts have been devoted to the study on the quantum information and communication, and a series of important progress has been made. One example is the realization of dense coding in quantum communication, which exploits nonlocal quantum correlation of entangled states.[1,2,3,4,5,6,7,8,9,10,11,12,13] Normally the classical capacity of the transmission channel is 1 bit; in dense coding, with the help of entanglement, two bits can be transmitted in principle by sending only one qubit.
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