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

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The entanglement in one-dimensional random XY spin systems where the impurities of exchange couplings and the exteal 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 systemis also studied when the exchange couplings (or the exteal 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 exteal magnetic field and the distributions of impurities.Moreover, the entanglement of some nearest-neighbouring qubits can be increased for certain parameter values of the three different distributions.
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