Antiresonance and interaction-induced localization in spin and qubit chains with defects

Details Antiresonance and interaction-induced localization in spin and qubit chains with defects Antiresonance and interaction-induced localization in spin and qubit chains with defects

2003-08-01

arxiv.org/abs/cond-mat/0308026v2

J. Phys. A 36, L561 (2003)

Physics

Condensed Matter

Updated version

Scientific paper

10.1088/0305-4470/36/44/L01

We study a spin chain with an anisotropic XXZ coupling in an external field. Such a chain models several proposed types of a quantum computer. The chain contains a defect with a different on-site energy. The interaction between excitations is shown to lead to two-excitation states localized next to the defect. In a resonant situation scattering of excitations on each other might cause decay of an excitation localized on the defect. We find that destructive quantum interference suppresses this decay. Numerical results confirm the analytical predictions.

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