Lei Wang, Jie-Hui Huang, Jonathan P. Dowling, Shi-Yao Zhu
We present a scheme of quantum information transmission, which transmits the
quantum information contained in a single qubit via the quantum correlation
shared by two parties (a two-qubit channel), whose quantum discord is non-zero.
We demonstrate that the quantum correlation, which may have no entanglement, is
sufficient to transmit the information of a quantum state. When the correlation
matrix of the two-qubit channel is of full rank (rank three), the information
of the qubit in either a mixed state or a pure state can be transmitted. The
quantum discord of a channel with rank larger than or equal to three is always
non-zero. Therefore, non-zero quantum discord is also necessary for our quantum
information transmission protocol.
View original:
http://arxiv.org/abs/1106.5097
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