Boosting information transfer in a quantum correlated medium

TL;DR

This paper demonstrates that nonclassical correlations with nonzero discord in a quantum spin chain can enhance information transfer efficiency without the need for entanglement, by breaking spatial symmetry in information spread.

Contribution

It introduces a method to boost quantum information transfer using non-entangled quantum correlations, expanding the understanding of quantum communication mediums.

Findings

Nonclassical correlations increase information flow in spin chains.

Quantum discord enhances transfer speed without entanglement.

Breaking spatial symmetry correlates with improved information spreading.

Abstract

Sharing and receiving information plays a pivotal role in science and technology. Quantum communication relies on the principles of quantum mechanics to transmit information in a nonclassical manner. Existing quantum communication protocols are commonly based on shared entangled states between sender and receiver, while the transmitting medium is classical. We here demonstrate that information transfer may be enhanced in a quantum correlated medium without entanglement distribution. We concretely show that nonclassical correlations, with nonzero discord, between the first two spins of a spin chain that acts as a quantum wire can increase the information flow and reduce the propagation time. We relate this effect to the breaking of the spatial symmetry of the out-of-time-order correlator that characterizes the spread of information through the medium.