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Realizable spin models are investigated in a two superconducting flux qubitsystem. It is shown that a specific adjustment of system parameters in the twoflux qubit system makes it possible to realize an artificial two-spin systemthat cannot be found naturally. For the artificial two-spin systems, timeevolution of a prepared quantum state is discussed to quantify quantumentanglement dynamics. The concurrence and fidelity as a function of time areshown to reveal a characteristic entanglement dynamics of the artificial spinsystems. It is found that the unentangled input state can evolute to be amaximally entangled output state periodically due to the exchange interactionsinduced by two-qubit flipping tunneling processes while single-qubit flippingtunneling processes plays a role of magnetic fields for the artificial spins.

Realizable spin models and entanglement dynamics in superconducting flux qubit systems