Effects of impurity on fidelity of quantum state transfer via spin channels

Details Effects of impurity on fidelity of quantum state transfer via spin channels Effects of impurity on fidelity of quantum state transfer via spin channels

2011-12-04

arxiv.org/abs/1112.0738v1

Physica B, 2011, 406(2): 270-274

Physics

Quantum Physics

5 pags

Scientific paper

10.1016/j.physb.2010.10.066

By adopting the concept of fidelity, we investigated efficiency of quantum state transfer with the XX chain as the quantum channel. Different from the previous works, we concentrated on effects of spin and magnetic impurity on fidelity of quantum state transfer. Our results revealed that the spin impurity cannot prevent one from implementing perfect transfer of an arbitrary one-qubit pure state across the spin channel, however, the presence of magnetic impurity or both spin and magnetic impurities may destroy the otherwise perfect spin channels.

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