Disorder overtakes Order in Information Concentration over Quantum Networks

TL;DR

This paper demonstrates that disorder in quantum XY spin chains can enhance genuine multiparty entanglement and quantum communication capacity, revealing an order-from-disorder phenomenon in quantum networks.

Contribution

It introduces the concept of disorder-induced enhancement of multiparty entanglement and quantum capacity in disordered quantum XY models.

Findings

Disorder can increase genuine multiparty entanglement in ground states.

Disorder enhances multiport quantum dense coding capacity.

Order-from-disorder phenomenon observed in quantum networks.

Abstract

We consider different classes of quenched disordered quantum XY spin chains, including quantum XY spin glass and quantum XY model with a random transverse field, and investigate the behavior of genuine multiparty entanglement in the ground states of these models. We find that there are distinct ranges of the disorder parameter that gives rise to a higher genuine multiparty entanglement than in the corresponding systems without disorder -- an order-from-disorder in genuine multiparty entanglement. Moreover, we show that such a disorder-induced advantage in the genuine multiparty entanglement is useful -- it is almost certainly accompanied by a order-from-disorder for a multiport quantum dense coding capacity with the same ground state used as a multiport quantum network.