Duplex quantum communication through a spin chain

TL;DR

This paper explores a two-way quantum communication protocol over a spin chain, demonstrating that simultaneous bidirectional data transfer can improve fidelity, which is promising for quantum network development.

Contribution

It introduces a duplex quantum communication scheme using a spin chain, showing that bidirectional transfer can enhance transmission fidelity.

Findings

Transmission fidelity can be improved with two-party communication.

Simultaneous data transfer is feasible through a single spin chain.

The scheme supports the viability of duplex quantum communication.

Abstract

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)|0> + sin({\theta}1/2)exp(i{\phi}1)|1>, cos({\theta}2/2)|0> + sin({\theta}2/2)exp(i{\phi}2)|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.