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

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

2008-08-27

arxiv.org/abs/0808.3678v1

Chinese Physics B 2008 17(3): 0794-07

Physics

Quantum Physics

13 pages, 4 figures

Scientific paper

10.1088/1674-1056/17/3/010

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.

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