科研之友
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摘要
Data multiplexing within a quantum computer can allow for the simultaneous transfer of multiple streams of information over a shared medium thereby minimizing the number of channels needed for requisite data transmission. Here, we investigate a two-way quantum communication protocol using a spin chain placed in an external magnetic field. In our scheme, Alice and Bob each play the role of a sender and a receiver as two states, cos(theta(1)/2)vertical bar 0 > + sin(theta(1)/2) e(i theta 1)vertical bar 1 > and cos(theta(2)/2)vertical bar 0 > + sin(theta(2)/2)e(i theta 2)vertical bar 1 >, are transferred through one channel simultaneously. We find that the transmission fidelity at each end of a spin chain can usually be enhanced by the presence of a second party. This is an important result for establishing the viability of duplex quantum communication through spin chain networks.
