Disorder overtakes order in information concentration over quantum networks
R. Prabhu, Saurabh Pradhan, Aditi Sen, Ujjwal Sen · Physical Review A · 2011
We consider different classes of quenched disordered quantum $XY$ spin chains, including a quantum $XY$ spin glass and a 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 give rise to a higher genuine multiparty entanglement than in the corresponding systems without disorder: an order-from-disorder phenomenon 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 phenomenon for a multiport quantum dense coding capacity with the same ground state used as a multiport quantum network.