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We exploit quantum discord (and geometric discord) to detect quantumcorrelations present in a well-known communication model called quantum randomaccess codes (QRACs), which has a variety of applications in areas ranging formquantum communication complexity, network coding, information causality, tosecurity proof of QKD protocol. In spite of the fact that there is noentanglement between the two parts involved in this model, analyticalderivation shows that the quantum discord is nonzero and highlights thatquantum discord might be regarded as a figure of merit to characterize thequantum feature of QRACs, since this model has no classical counterparts. Togain further insight, we also investigate the dynamical behavior of quantumdiscord under state rotations. As a comparison, the connection between quantumdiscord and dimension witness is graphically discussed. Interestingly, ourresults illustrate that these two quantities are monotonically related to eachother, which implies that the dimension witness and nonclassical correlationsmay be intrinsically linked.

Quantum discord in quantum random access codes and its connection with dimension witness