Entanglement control in one-dimensional $s=1/2$ random XY spin chain

TL;DR

This paper investigates how entanglement in a one-dimensional random XY spin chain can be controlled by varying external magnetic fields and impurity distributions, revealing potential for enhancing entanglement between neighboring qubits.

Contribution

It introduces a detailed analysis of entanglement control in disordered XY spin chains considering various impurity distributions and external magnetic field variations.

Findings

Entanglement can be manipulated by changing magnetic field strength.

Different impurity distributions affect entanglement dynamics.

Certain parameters can enhance nearest-neighbor entanglement.

Abstract

The entanglement in one-dimensional random XY spin systems where the impurities of exchange couplings and the external magnetic fields are considered as random variables is investigated by solving the different spin-spin correlation functions and the average magnetization per spin. The entanglement dynamics near particular locations of the system is also studied when the exchange couplings (or the external magnetic fields) satisfy three different distributions(the Gaussian distribution, double-Gaussian distribution, and bimodal distribution). We find that the entanglement can be controlled by varying the strength of external magnetic field and the different distributions of impurities. Moreover, the entanglement of some nearest-neighboring qubits can be increased for certain parameter values of the three different distributions.