Realizable spin models and entanglement dynamics in superconducting flux qubit systems
Abstract
Realizable spin models are investigated in a two superconducting flux qubit system. It is shown that a specific adjustment of system parameters in the two flux qubit system makes it possible to realize an artificial two-spin system that cannot be found naturally. For the artificial two-spin systems, time evolution of a prepared quantum state is discussed to quantify quantum entanglement dynamics. The concurrence and fidelity as a function of time are shown to reveal a characteristic entanglement dynamics of the artificial spin systems. It is found that the unentangled input state can evolute to be a maximally entangled output state periodically due to the exchange interactions induced by two-qubit flipping tunneling processes while single-qubit flipping tunneling processes plays a role of magnetic fields for the artificial spins.
Cite
@article{arxiv.0706.2402,
title = {Realizable spin models and entanglement dynamics in superconducting flux qubit systems},
author = {Qian Qian Shi and Sam Young Cho and Bo Li and Mun Dae Kim},
journal= {arXiv preprint arXiv:0706.2402},
year = {2007}
}